Journal articles on the topic 'FRP tube'
To see the other types of publications on this topic, follow the link: FRP tube.
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 journal articles for your research on the topic 'FRP tube.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.
1
Chen, Chen, Ying Hua Zhao, Chun Yang Zhu, and Li Wei. "Study on the Impact Response of Concrete Filled FRP-Steel Tube Structures." Advanced Materials Research 368-373 (October 2011): 549–52. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.549.
Full textAbstract:
This paper studies the impact performance of concrete filled FRP-steel tube which is a composed structure made by filling concrete into steel tube and wrapping outside with fiber reinforced polymer (FRP) sheet. Numerical simulations have been conducted to study the dynamic response of fixed-pined supported beams of concrete filled FRP-steel tubes. The finite element models of concrete filled FRP-steel tubes are established to analyse its lateral impact dynamic characteristics under different loading situations, with respective kinds of FRP and thicknesses of steel tubes. The impact force and displacement histories were recorded. Comparing to the traditional concrete filled steel tube structure, the concrete filled FRP-steel tube indicates a promising structure with more advantages in the mechanical and constructional performance. Especially with its higher loading-carrying capacity and better toughness, it is more adaptable for the structures subjected to accidental impact load. Analytical solution is compared with experimental result to show the correctness and the effectiveness of present study.
2
Zhang, Bing, Yu-Jun Qi, Tao Huang, Qian-Biao Zhang, Yu Hu, and Xia-Min Hu. "Effect of Fiber Angles on Hybrid Double-Tube Concrete Columns under Monotonic Axial Compression." Advances in Civil Engineering 2019 (December 20, 2019): 1–19. http://dx.doi.org/10.1155/2019/2363185.
Full textAbstract:
Hybrid double-tube concrete columns (hybrid DTCCs) are a novel form of hybrid columns that combine fiber-reinforced polymer (FRP) composites with two traditional construction materials (i.e., concrete and steel). Hybrid DTCCs consist of an outer FRP tube and an inner steel tube aligned concentrically, with the space between the two tubes and inside of the steel tube filled with concrete. The three materials (i.e., FRP, concrete, and steel) in hybrid DTCCs are combined optimally to deliver excellent performances, such as excellent ductility and remarkable corrosion resistance. Recently, hybrid DTCCs have received increasing research attention on their compressive behavior. Existing studies, however, are focused on hybrid DTCCs with fibers of the FRP tube oriented in the hoop direction or close to the hoop direction. Against this background, this paper presents a series of monotonic axial compression tests on hybrid DTCCs with a particular focus on the effect of fiber angles (i.e., the angle of the fiber orientations to the longitudinal axis of the FRP tube). Three types of fiber angles (i.e., ±45°, ±60°, or ±80°) and two FRP tube thicknesses (i.e., 4 mm and 8 mm) were employed in the present study. Experimental results show that the concrete in hybrid DTCCs is well confined by both the FRP tube and the steel tube, leading to excellent ductility; the confinement effect of the FRP tube increases with the increase of the absolute value of fiber angles, whereas the ultimate axial strain decreases with the increase of the absolute value of fiber angles. An existing analysis-oriented model, which considers the different confining states of the concrete between the two tubes and that inside of the steel tube, is verified using the present test results. The model is capable of providing accurate predictions for hybrid DTCCs with a ±80° FRP tube. For hybrid DTCCs with a ±45° or ±60° FRP tube, the model yields reasonable accurate predictions for the peak axial load but underestimates the ultimate axial strain consistently.
3
Wei, Yang, Gang Wu, Zhi Shen Wu, and Dong Sheng Gu. "Flexural Behavior of Concrete-Filled FRP-Steel Composite Circular Tubes." Advanced Materials Research 243-249 (May 2011): 1316–20. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.1316.
Full textAbstract:
Three large-scale concrete-filled FRP-steel composite circular tubes and a control steel tube were tested to investigate flexural behavior. The effects of FRP and composite with different types of FRP with various ultimate strains were investigated. The study demonstrated the important effect of FRP, and showed that the load-displacement curves of FRP-steel composite tube beams could be divided into four stages: elastic stage, plastic stage, hardening stage and residual stage. An additional decline stage was gained for multi-fiber with different ultimate strains and steel composite tube concrete beams. FRP could increase the ultimate bearing capacity and bring the hardening stage after steel tube yielding, and a certain degree of stiffness would be achieved to avoid the “zero stiffness”. The composite of a variety of FRP could relax fracture failure for the FRP-steel composite steel concrete beams, realized the successive rupture of fiber in batches and changed the failure modes.
4
Ozbakkloglu, Togay, and Wen Zhang. "Investigation of Key Column Parameters on Compressive Behavior of Concrete-Filled FRP Tubes." Applied Mechanics and Materials 256-259 (December 2012): 779–83. http://dx.doi.org/10.4028/www.scientific.net/amm.256-259.779.
Full textAbstract:
A comprehensive experimental program has been underway at the Structures Laboratory of the University of Adelaide to investigate the behavior of concrete-filled fiber-reinforced polymer (FRP) tubes (CFFTs) under concentric compression. This paper presents the results from a group of selected circular CFFTs and discusses the influence of the critical column parameters on the compressive behavior of CFFTs. These parameters include: concrete strength, amount and type of FRP tube material, manufacturing method of the tubes, and size of the CFFTs. Results indicate that concrete strength and the amount and type of tube material significantly affect the behavior of CFFTs. The manufacture method of FRP tube also has some, but less significant, influence on the behavior of CFFTs. The influence of specimen size has been found to be small. No apparent difference has been found between the compressive behaviors of circular CFFTs and companion FRP-wrapped cylinders.
5
Yu, Feng, and Ping Wu. "Study on Stress-Strain Relationship of FRP-Confined Concrete Filled Steel Tubes." Advanced Materials Research 163-167 (December 2010): 3826–29. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.3826.
Full textAbstract:
FRP-confined concrete filled steel tube may fully use the character of FRP-confined concrete and concrete filled steel tube. Based on the analysis of existing experimental data, the formula of ultimate bearing capacity of FRP-confined concrete filled steel tube is proposed. The mechanical behavior of FRP-confined concrete filled steel tube is mainly related to the equivalent confinement effect coefficient before the rupture of FRP. Based on the static equilibrium condition, the equivalent conversion section is adopted; taking as main parameter, the simplified stress-strain model of FRP-confined concrete filled steel tube is established. The predictions of the model agree well with test data.
6
Ferdous, Wahid, Allan Manalo, Omar S. AlAjarmeh, Yan Zhuge, Ali A. Mohammed, Yu Bai, Thiru Aravinthan, and Peter Schubel. "Bending and Shear Behaviour of Waste Rubber Concrete-Filled FRP Tubes with External Flanges." Polymers 13, no. 15 (July 29, 2021): 2500. http://dx.doi.org/10.3390/polym13152500.
Full textAbstract:
An innovative beam concept made from hollow FRP tube with external flanges and filled with crumbed rubber concrete was investigated with respect to bending and shear. The performance of the rubberised-concrete-filled specimens was then compared with hollow and normal-concrete-filled tubes. A comparison between flanged and non-flanged hollow and concrete-filled tubes was also implemented. Moreover, finite element simulation was conducted to predict the fundamental behaviour of the beams. The results showed that concrete filling slightly improves bending performance but significantly enhances the shear properties of the beam. Adding 25% of crumb rubber in concrete marginally affects the bending and shear performance of the beam when compared with normal-concrete-filled tubes. Moreover, the stiffness-to-FRP weight ratio of a hollow externally flanged round tube is equivalent to that of a concrete-filled non-flanged round tube. The consideration of the pair-based contact surface between an FRP tube and infill concrete in linear finite element modelling predicted the failure loads within a 15% margin of difference.
7
Veerapandian, Varunkumar, Gajalakshmi Pandulu, Revathy Jayaseelan, Veerappan Sathish Kumar, Gunasekaran Murali, and Nikolai Ivanovich Vatin. "Numerical Modelling of Geopolymer Concrete In-Filled Fibre-Reinforced Polymer Composite Columns Subjected to Axial Compression Loading." Materials 15, no. 9 (May 9, 2022): 3390. http://dx.doi.org/10.3390/ma15093390.
Full textAbstract:
In this research study, the performance of geopolymer concrete (GPC) in-filled fibre-reinforced polymer (FRP) composite (GPC-FRP) columns exposed to compressive loading is examined using the finite element (FE) analysis. The load–deflection behaviour is investigated by considering the impact of the strength of concrete, different fibre orientations and thicknesses of FRP tubes in terms of the diameter/thickness (D/t) ratio, surface friction in between the concrete and enclosing FRP tube, the lateral confinement and the axial stress distribution characteristics. The load-carrying capacity (LCC) of the GPC-FRP composite columns and cement concrete (CC) in-filled FRP composite (CC-FRP) columns is compared and the results imply that the LCC of the GPC-FRP composite columns is (0.9 to 2.04%) greater than the CC-FRP composite columns. The improvement in the LCC and lateral confining pressure of the GPC-FRP composite columns is observed as the thickness of the FRP tube increases. The LCC of the GPC-FRP composite columns with a D/t ratio of 30 was almost (12.70 to 14.23%) greater than the GPC-FRP composite columns with a D/t ratio of 50. The GPC-FRP composite columns with a fibre orientation in the axial and hoop directions (0°) exhibit (8.4 to 11.39%) better performance than the columns with any other orientations (30° and 53°). The LCC of the GPC-FRP composite columns with a coefficient of friction of 0.25 and 0.5 are quite comparable. The axial stress distribution in the GPC-FRP composite columns with different tube thicknesses is explored in this research. This FE model is validated with the experimental results obtained by Kim et al., (2015) and the load and deflection are predicted with the validation error of 6.5 and 6.1%, respectively.
8
Zhang, Bing, Gui-Sen Feng, Yan-Lei Wang, Cong-Cong Lai, Chen-Chen Wang, and Xia-Min Hu. "Elliptical FRP-Concrete-Steel Double-Skin Tubular Columns under Monotonic Axial Compression." Advances in Polymer Technology 2020 (January 24, 2020): 1–16. http://dx.doi.org/10.1155/2020/7573848.
Full textAbstract:
Hybrid FRP-concrete-steel double-skin tubular columns (hybrid DSTCs) are a novel form of hollow columns consisting of an outer FRP tube, an inner steel tube, and an annular layer of concrete between the two tubes. Due to the effective confinement of the two tubes, the concrete in hybrid DSTCs is well confined, leading to excellent ductility and strength enhancement. Hybrid DSTCs also have excellent corrosion resistence due to the effective protection of the outer FRP tube. However, existing studies mainly focused on hybrid DSTCs with a circular cross-section. When subjecting to different loads in the two horizontal directions, elliptical columns are preferred as they can provide different bending stiffness and moment capacity around two axes of symmetry without significantly reducing the confining effect of the FRP tube. This paper extends the existing work on circular DSTCs to elliptical DSTCs with a particular focus on four issues: the effect of elliptical aspect ratio (i.e., the ratio of the major axis to the minor axis of the outer elliptical cross-section), the effect of the FRP tube thickness, the effect of void area ratio (i.e., the ratio of the area of concrete void to the area of the outer elliptical section), and the effect of the cross-section of the inner steel tube (i.e., both rectangular and elliptical steel tubes were used). Experimental results show that, the averaged peak stress of the confined concrete in elliptical DSTCs increases with the increase in the elliptical aspect ratio, whereas the elliptical aspect ratio has no obvious effect on the ultimate axial strain; the cross-section shape of the inner steel tube has significant effect on the axial stress-strain behavior of the confined concrete in elliptical DSTCs; elliptical DSTCs with an elliptical steel tube exhibit much better ductility and strength enhancement than those specimens with a rectangular steel tube. A simple stress-strain model of confined concrete was proposed for elliptical DSTCs to account for the effects of the elliptical aspect ratio, the inner void, and the shape of the inner steel tube, which can provide reasonably accurate but conservative predictions.
9
Louk Fanggi, Butje Alfonsius, Anastasia Henderina Muda, Abia Erasmus Mata, Albert Aun Umbu Nday, Melchior Bria, and Abrosius Raha Lelang Wayan. "KUAT TEKAN KOLOM BETON RINGAN YANG DIPERKUAT DENGAN CARBON FIBER REINFORCED POLYMER TUBE." JUTEKS - Jurnal Teknik Sipil 3, no. 1 (July 15, 2018): 259. http://dx.doi.org/10.32511/juteks.v3i1.201.
Full textAbstract:
Penelitian ini bertujuan untuk menguji sejauhmana FRP tube yang terbuat dari Carbon Fiber Sheet efektif digunakan sebagai material perkuatan kolom beton ringan pada saat kolom tersebut dibebani secara tekan sentris. Sejumlah delapan buah silinder beton ringan dengan ukuran diameter 150 mm dan tinggi 300 mm dicetak dan dites hingga hancur. Kedelapan silinder tersebut terdiri dari dua buah silinder tanpa perkuatan, empat buah silinder dengan perkuatan menggunakan FRP tube, dan dua buah silinder dengan perkuatan menggunakan FRP wrapping. Hasil penelitian ini tidak dapat menunjukan sejauhmana FRP tube maupun wrapping efektif digunakan untuk memperkuat beton ringan karena benda uji miring. Walaupun demikian, tampak bahwa FRP tube dengan 3 lapis sangat efektif untuk memperkuat beton ringan Karena itu, untuk mengatasi masalah kemiringan pada benda uji yang diperkuat dengan FRP tube, perlu digunakan bekesting pada saat pengecoran.
10
Zhou, Le, Kai Li, and Ji Hong Jiang. "Mechanical Properties Study of FRP Tube Steel Reinforced Concrete Structure Subjected to Axial Compression." Advanced Materials Research 482-484 (February 2012): 1605–10. http://dx.doi.org/10.4028/www.scientific.net/amr.482-484.1605.
Full textAbstract:
In order to facilitate the actual design of the project, we study force performance of FRP tube steel-reinforced concrete columns under axial load. By five FRP tube steel reinforced concrete structures of axial compression, explore the damage characteristics and the force characteristics of the combination of column, and study parameters on performance of the force combination of column such as FRP tube wall thickness, fiber winding angle and loading mode etc. The capacity of combination column increases with the larger of the FRP tube wall thickness; and increases with the smaller of the FRP fiber winding angle; loaded in different ways lead to different capacities. Using superposition method Study and deduce a more reasonable axial compressive bearing capacity formula of FRP tube steel reinforced concrete structure. Theoretical calculation results match well with experimental results.
11
Zhang, Ni, Chenyang Zheng, Zhongwei Zhao, and Bo Yang. "Eccentric compression behavior of FRP-concrete-steel tubular composite columns." Advances in Mechanical Engineering 13, no. 9 (September 2021): 168781402110355. http://dx.doi.org/10.1177/16878140211035587.
Full textAbstract:
FRP-concrete-steel tubular (FCS) composite columns are composed of the external tube, the internal steel tube, and the concrete between both tubes. They have been attracting the attention of many researchers due to their high ductility, lightweight, resistance to corrosion, and easiness of construction. However, there are few studies on FRP-concrete-steel tubular composite columns under eccentric load. To investigate the behavior of composite columns under the eccentric compression, a non-linear analysis program for FCS composite columns was compiled. The program was verified by existing tests, and the influences of eccentricity, FRP tube wall thickness, steel tube wall thickness, steel tube radius, slenderness ratio, and concrete strength grade on the eccentric compression performance were systematically analyzed. The results showed that the calculated results were in good agreement with the experimental results. It showed that the program can accurately reflect the deformation of FCS composite columns under various loads and estimate the ultimate load of FCS composite columns under eccentric compression. The eccentric ultimate load increased with the decrease of eccentricity and slenderness ratio, and with the increase of FRP tube wall thickness, steel tube wall thickness, and concrete strength grade. The ultimate eccentric load decreased with the increase of steel tube radius, but when the steel tube wall thickness reached a certain thickness, the ultimate eccentric load of FCS composite columns increases with the increase of steel tube radius. The conclusion can provide reference for the practical application of the structure.
12
Zhou, Ying Wu, Feng Xing, and Li Li Sui. "Reliability Assessments of Concrete Filled FRP Tube Columns." Applied Mechanics and Materials 405-408 (September 2013): 731–34. http://dx.doi.org/10.4028/www.scientific.net/amm.405-408.731.
Full textAbstract:
This paper has investigated the reliability of concrete filled FRP tube columns using the FRP confined concrete theory developed recently by the authors. The reliability index of the column is assessed by Monte Carlo method. The importance of the use of partial safety factors of FRP and concrete in the reliability design of concrete filled FRP tube columns is studied. The results indicate that the reliability index of concrete filled FRP tube columns increases remarkably as the FRP partial safety factor increased. It is concluded that the FRP partial safety factor is independent on the coefficient of variation of FRP strength but is highly sensitive to the coefficient of variation of concrete strength especially in the case of low confinement ratio. Considering the actual situation in engineering applications, to reach a target reliability index of 3.5, a partial safety factor of 1.4 is finally recommend for both FRP and concrete.
13
Deng, Zong-cai, and Jiu-ling Qu. "The Experimental Studies on Behavior of Ultrahigh-Performance Concrete Confined by Hybrid Fiber-Reinforced Polymer Tubes." Advances in Materials Science and Engineering 2015 (2015): 1–18. http://dx.doi.org/10.1155/2015/201289.
Full textAbstract:
This paper conducts axial compression test of ultrahigh performance concrete- (UHPC-) filled hybrid FRP (HFRP) tubes, using the alternating hybrid technology to improve the deformation capacity of FRP tube and measure the axial compressive responses of ultimate strength, strains, and stress-strain curve of confined specimens. The test results show that the local rupture of HFRP tubes did not lead to explosive failure of UHPC cylinder, and its ductility is better than that of UHPC confined by only one type of FRP tube; HFRP tube can effectively improve the compressive strength and ultimate strain of UHPC specimens; the stress-strain curves divide into three distinct regions: linear phase, transition phase, and linear strengthening phase. None of the models provided a reasonable prediction for strength and strain of HFRP-confined UHPC specimen; therefore, a new ultimate strength and strain perdition model considering the confinement effectiveness of different hybrid FRP series was proposed. The new proposed model presented the best fitting results. The stress-strain responses predicted by the existing models are all below the experimental curves; therefore, a new three-stage constitutive model was proposed, which relatively fits the test curves better than the existing models.
14
Zeng, Junjie, and Tianwei Long. "Compressive Behavior of FRP Grid-Reinforced UHPC Tubular Columns." Polymers 14, no. 1 (December 30, 2021): 125. http://dx.doi.org/10.3390/polym14010125.
Full textAbstract:
In this study, a novel form of tubular columns that is made of ultra-high-performance concrete (UHPC) internally reinforced with fiber-reinforced polymer (FRP) grid (herein referred to as FRP grid-UHPCtubular column) was developed. The axial compression test results of FRP grid-UHPC tubular columns with and without in-filled concrete are presented and discussed. Effects of the number of the FRP grid-reinforcing cages, the presence of in-filled concrete, and the presence of external FRP confinement were investigated. The test results confirmed that the FRP-UHPC tubular columns have a satisfactory compressive strength, and the strength and ductility of FRP-confined concrete-filled FRP grid-UHPC tube columns are enhanced due to the confinement from the FRP wrap. The proposed FRP grid-reinforced UHPC composite tubes are attractive in structural applications as pipelines or permanent formworks for columns, as well as external jackets (can be prefabricated in the form of two halves of tubes) for strengthening deteriorated reinforced concrete columns.
15
Wang, Zheng-zhen, Wei-ming Gong, Guo-liang Dai, and Ling-feng Liu. "Analysis of Bond Behavior of FRP-Confined Concrete Piles Based on Push-Out Test." Advances in Materials Science and Engineering 2020 (February 26, 2020): 1–17. http://dx.doi.org/10.1155/2020/3186832.
Full textAbstract:
Due to the significant differences in the properties (e.g., anisotropy, elasticity modulus, and surface roughness) of fibre-reinforced polymer (FRP) and traditional pile materials, research on bond behavior between FRP tube and concrete should be conducted to ensure that they can work together properly. Push-out tests on twenty-nine GFRP-confined concrete piles were performed, the influence of bond type, slenderness ratio of FRP tube, radius-thickness ratio of FRP tube, concrete stress and concrete type on bond behavior and distribution of axial strains were studied, and simplified bond-slip constitutive models based on test results were proposed. It was found that bond type was a critical factor influencing bond behavior. A smaller radius-thickness ratio, a higher concrete stress, and the use of expansive concrete were advantageous for achieving higher bond behavior, whereas the slenderness ratio had little influence on the bond behavior. The axial strain distribution of all FRP tubes demonstrated the following rules: the upper strain was greater than the middle strain, which was larger than the lower strain, but for normal concrete specimens, the strain was linearly distributed with height, while for expanded concrete specimens, the distribution curves were polylines.
16
Vincent, Thomas, and Togay Ozbakkaloglu. "Predicting Strain Reduction Factor for Concrete-Filled FRP Tube Columns Incorporating Interface Gap and Prestress." Solid State Phenomena 263 (September 2017): 18–23. http://dx.doi.org/10.4028/www.scientific.net/ssp.263.18.
Full textAbstract:
This paper reports the findings from an analytical study into the influence of fiber reinforced polymer (FRP)-to-concrete interface gap and prestressed FRP tubes on strain reduction factor (kε) for concrete-filled FRP tube (CFFT) columns. A database that consists of a total of 45 aramid FRP- (AFRP) confined normal-and high-strength concrete (NSC and HSC) specimens with circular cross-sections is presented. All specimens were cylinders with a 152 mm diameter and 305 mm height, and their unconfined concrete strengths ranged from approximately 45 to 110 MPa. Analyses of the experimental databases that consisted of 22 specimens manufactured with FRP-to-concrete interface gap and a further 23 specimens prepared with lateral prestress is presented and discussed. Based on close examination of the hoop strain development on the FRP confining shell, expressions to predict strain reduction factors (kε) are proposed. The comparison of the proposed model predictions with the experimental test results of specimens prepared with an interface gap or prestressed FRP tubes shows good agreement.
17
Ozbakkloglu, Togay, and Butje Alfonsius Louk Fanggi. "An Experimental Study on Behavior of FRP-HSC-Steel Double-Skin Tubular Columns under Concentric Compression." Applied Mechanics and Materials 357-360 (August 2013): 565–69. http://dx.doi.org/10.4028/www.scientific.net/amm.357-360.565.
Full textAbstract:
This paper reports on part of an ongoing experimental program at The University of Adelaide on FRP-concrete-steel composite columns. The results from eight FRP-concrete-steel double-skin columns (DSTCs) that were tested under constant axial compression are presented. The key parameters examined included diameter, thickness, and strength of inner steel tube. The results of the experimental study indicate that concrete in a DSTC system is confined effectively by FRP and steel tubes. The results also indicate that increasing the inner steel tube diameter leads to an increase in the ultimate axial strength and strain of DSTCs. No clear influence of the strength of inner steel tube is observed on the ultimate condition of concrete in DSTCs. These results are presented together with a discussion on the influence of the key parameters on the compressive behavior of DSTCs.
18
Hou, Jian, and Li Song. "Ultimate Limit Design of Strengthened Steel Columns by Mortar-Filled FRP Tubes." Mathematical Problems in Engineering 2021 (March 5, 2021): 1–9. http://dx.doi.org/10.1155/2021/6676267.
Full textAbstract:
The present study investigated the various failure modes of strengthened steel columns by mortar-filled fiber-reinforced polymer (FRP) tubes to analytically formulate the ultimate capacities of these steel columns. A simple and effective method, wherein a mortar-filled FRP tube was sleeved outside the steel member, was also formulated to enhance the buckling resistance capacity of compressed steel members. In addition, to facilitate the connection of the column to other structural members, the length of the sleeved mortar-filled FRP tubes is less than that of the original steel columns. Theoretical analyses were also performed on the critical sections of such composite columns at their ultimate states to identify their potential failure modes, such as FRP-tube splitting at the ends or on the insides of wrapped areas, local buckling at the steel ends of transition zones, and global buckling of the composite columns. The corresponding ultimate capacity of each failure mode was then analytically formulated to characterize the critical failure mode and ultimate load capacity of the columns. The current theoretical results were compared with those from literature to validate the applicability of the developed ultimate limit design approaches for FRP-mortar-steel composite columns.
19
YUAN, WENQING, and AMIR MIRMIRAN. "BUCKLING ANALYSIS OF CONCRETE-FILLED FRP TUBES." International Journal of Structural Stability and Dynamics 01, no. 03 (September 2001): 367–83. http://dx.doi.org/10.1142/s0219455401000251.
Full textAbstract:
Fiber reinforced polymer (FRP) tubes can be filled with concrete to serve as structural columns or piles. The tube provides confinement and strength for the core, whereas the concrete core enhances the overall stability of the system. This paper reports on an analytical and experimental study of the static buckling of thin-walled FRP tubes filled with concrete and bent in single curvature. A comprehensive parametric study on over 11 500 columns shows that concrete-filled FRP tubes are much more susceptible to buckling than concrete columns with internal steel reinforcement. A number of modifications are suggested for the existing stability design equations of critical length and moment magnification of concrete columns to make them applicable to concrete-filled FRP tubes.
20
Zhu, Zhenyu, Iftekhar Ahmad, and Amir Mirmiran. "Effect of Column Parameters on Axial Compression Behavior of Concrete-Filled FRP Tubes." Advances in Structural Engineering 8, no. 4 (August 2005): 443–49. http://dx.doi.org/10.1260/136943305774353098.
Full textAbstract:
Axial compression tests have shown fiber reinforced polymer (FRP) tubes to significantly enhance both strength and ductility of concrete columns. However, most experiments and associated models typically do not account for the internal reinforcement, size effect of the column, and the end load-bearing conditions of the tube. An experimental program was undertaken to evaluate the effect of these parameters on the performance of CFFT columns. Glass FRP tubes filled with plain, steel-reinforced, and glass FRP-reinforced concrete were tested with and without end grooves, which would prevent the tube from directly bearing of the axial load. The experiments showed the dowel action of the internal reinforcement to improve the ductility of the columns by restraining the lateral dilation of concrete core. Anempirically derived confinement model, augmented with the stress-strain response of the internal reinforcement, showed close agreement with test results.
21
Joo, Hyung Joong, Seung Sik Lee, Soon Jong Yoon, Ju Kyung Park, and Kwang Yeoul Shin. "Development of Hybrid FRP-Concrete Composite Compression Members." Advanced Materials Research 26-28 (October 2007): 329–32. http://dx.doi.org/10.4028/www.scientific.net/amr.26-28.329.
Full textAbstract:
The concrete-filled steel tubes have been widely used in buildings and civil structures. However the corrosion of the steel tubes results in the loss of load carrying capacities of the members and, therefore, there is a need for regular maintenance. To mitigate such maintenance issues and prevent the loss of load carrying capacity, FRP composite were suggested as the candidate material. A number of research works has shown that the use of FRP tubes produced by filament winding technique was very effective on the improvement of compressive strength of the concrete-filled FRP tubes (CFFT). However the filament wound FRP tubes did mot contribute to the increase of the flexural strength of a CFFT. In this paper, a new type of FRP tube which consists of several pultruded open sections assembled by filament winding technique is proposed to improve compressive strength as well as flexural strength of a CFFT. The load carrying capacity of proposed CFFT is discussed through the analytical investigation.
22
Dong, Jing, Junhai Zhao, Dongfang Zhang, and Yingping Li. "Research on Dynamic Response of Concrete-Filled Steel Tube Columns Confined with FRP under Blast Loading." Shock and Vibration 2019 (July 10, 2019): 1–18. http://dx.doi.org/10.1155/2019/8692310.
Full textAbstract:
Recently, a concrete-filled steel tube confined with fiber-reinforced polymer (FRP) has become a hot research issue as a new type of structure. These studies mainly focus on its static performance and seismic and impact behaviour, with little research on its blast resistance performance. In this study, the dynamic response of concrete-filled steel tube columns confined with FRP under blast loading was investigated. Numerical analysis was implemented using multimaterial ALE method in the finite element analysis program LS-DYNA. The proposed numerical model was validated by the SDOF result and available experimental data. And the effects of the number of FRP layers, concrete strength, and cross section were also discussed in detail based on the proposed numerical model. The results indicate that the constraints of FRP effectively enhance the blast resistance of the column, and the vulnerable parts mainly occur at the middle and two ends of the column. The blast resistance of the column can be enhanced by increasing the number of FRP layers or concrete strength. These results could provide a certain basis for blast resistance design of concrete-filled steel tubes confined with FRP.
23
Zhang, Bing, Xia-Min Hu, Wei Wei, Qian-Biao Zhang, Ning-Yuan Zhang, and Yi-Jie Zhang. "Effect of Cross-Sectional Aspect Ratio on Rectangular FRP-Concrete-Steel Double-Skin Tubular Columns under Axial Compression." Advances in Polymer Technology 2020 (May 27, 2020): 1–15. http://dx.doi.org/10.1155/2020/1349034.
Full textAbstract:
Hybrid FRP-concrete-steel double-skin tubular columns (hybrid DSTCs) are novel hollow columns consisting of an outer FRP tube, an inner steel tube, and the concrete between the two tubes. Hybrid DSTCs possess important advantages, such as excellent corrosion resistance as well as remarkable seismic resistance. However, existing studies are mainly focused on hybrid DSTCs with a circular cross section or a square cross section. When a column is subjected to different load levels in the two horizontal directions, a rectangular column is preferred as it can provide different bending stiffness and moment capacity around its two axes of symmetry. This paper presents an experimental study on rectangular DSTCs with a particular focus on the effect of the cross-sectional aspect ratio (i.e., the ratio of the breadth to the width of the rectangular cross section). The effect of the cross-sectional shape of the inner steel tube (i.e., both elliptical and rectangular inner steel tubes were used) and the effect of FRP tube thickness were also investigated experimentally. Experimental results show that a larger aspect ratio will have no negative effect on the confinement effect in rectangular DSTCs; a rectangular DSTC with a larger aspect ratio generally has a larger ultimate axial strain and a higher axial stress at the ultimate axial strain; rectangular DSTCs with an elliptical steel tube generally have better performance than corresponding specimens with a rectangular steel tube. An existing model, which was developed based on a model for rectangular FRP-confined concrete columns and a model for circular DSTCs, is verified using the test results of the present study. The model generally provides close predictions for the peak axial stress of the confined concrete but yields conservative predictions for the ultimate axial strain for rectangular DSTCs.
24
Louk Fanggi, Butje Alfonsius, and Togay Ozbakkaloglu. "Influence of Concrete-Filling Inner Steel Tube on Compressive Behavior of Double-Skin Tubular Columns." Advanced Materials Research 838-841 (November 2013): 535–39. http://dx.doi.org/10.4028/www.scientific.net/amr.838-841.535.
Full textAbstract:
This paper reports on a part of an ongoing experimental program at the University of Adelaide on the behavior of fiber reinforced polymer (FRP)-concrete-steel double-skin tubular columns (DSTCs). Influence of concrete-filling inner steel tube on the compressive behavior of FRP-concrete-steel DSTCs was investigated experimentally through the test of 8 normal-and high-strength concrete DSTCs. The results of the experimental study indicate that concrete-filling inner steel tubes of DSTCs results in a slightly increase in the compressive strength and decrease in the ultimate strain of concrete in DSTCs, compared to companion DSTCs with hollow inner steel tubes. The results also indicate that concrete in both types of DSTCs is confined effectively by FRP and steel tubes.
25
Ali Dawoud, Ayman, Ahmed Abdelaal Abdelghany, Ahmed Abouzied, and Alaa Sherif. "EFFECT OF TRANSVERSE/AXIAL FIBER RATIOS ON THE FLEXURAL CAPACITY OF CONCRETE-FILLED FRP TUBE BEAMS." International Journal of Engineering Applied Sciences and Technology 6, no. 9 (January 1, 2022): 30–36. http://dx.doi.org/10.33564/ijeast.2022.v06i09.004.
Full textAbstract:
Fiber-reinforced polymer (FRP) composite materials have been used in the field of civil engineering constructions especially in corrosive environment. They can be used as internal reinforcement for beams, slabs, and pavements, or as external reinforcement for rehabilitation and strengthening different structures. One of their innovative applications is the concrete-filled FRP tubes (CFFTs) which are becoming an alternative for different structural members such as piles, columns, bridge girders, and bridge piers due to their high performance, durability and resistance to corrosion. In such integrated systems, the FRP tubes act as stay-in-place forms, protective jackets for the embedded concrete and steel, and as external reinforcement in the primary and secondary direction of the structural member [1,2,3]. This study investigates the flexural behaviour of square filament-wound FRP tubes filled with concrete, without any steel bars. The FRP tubes were fabricated by filament winding process and hand lay-up technique. Several test variables were chosen to investigate the effect of the fiber laminates structure, and the different ratios of axial-andtransverse fiber on the flexural behaviour of such CFFT beams. The beams were tested under four-point loading system. The results of the tested CFFT beams indicate significant gain in strength, stiffness, cracking moment and energy absorption with increasing the axial fiber percentage and by increasing the thickness of the FRP tube.
26
Wang, Jian, Junwu Xia, Hongfei Chang, Youmin Han, Linli Yu, and Li Jiang. "Experimental Study on Axial Compressive Behavior of Gangue Aggregate Concrete Filled FRP and Thin-Walled Steel Double Tubular Columns." Coatings 11, no. 11 (November 18, 2021): 1404. http://dx.doi.org/10.3390/coatings11111404.
Full textAbstract:
In the present paper, the monotonic axial compression test of gangue aggregate concrete filled Fiber reinforced polymer (FRP) and thin-walled steel double tubular columns (DTCC) was carried out, and the gangue aggregate concrete filled FRP tubular columns (CFFT) were designed as a comparison. The main experimental factors were the confinement level of the FRP jacket, the relative diameter ratio (the ratio of the outer diameter of the steel tube to the inner diameter of the FRP jacket), and the different strengths of gangue aggregate concrete. The test results show that the bearing capacity and ductility of gangue aggregate concrete in CFFT were significantly improved. As the local buckling of thin-walled steel tube was effectively inhibited, the load bearing capacity of DTCC was further improved compared with CFFT, but the change of dilation behavior and ductility was insignificant. By analyzing the bi-directional stress state of the steel tube, the confinement level of the external FRP jacket was the most sensitive factor affecting the hoop stress of the steel tube, and the axial stress was obviously weakened under the bi-directional stress state. In addition, with the increase of steel tube diameter, the confinement effect of steel tube in DTCC became more obvious.
27
Vincent, Thomas, and Togay Ozbakkloglu. "Axial Compressive Behavior of High- and Ultra High-Strength Concrete-Filled AFRP Tubes." Advanced Materials Research 671-674 (March 2013): 626–31. http://dx.doi.org/10.4028/www.scientific.net/amr.671-674.626.
Full textAbstract:
Concrete-filled FRP tubes (CFFTs) have received significant research attention over the last two decades. However, the experimental studies on the behavior of CFFTs filled with high- and ultra high-strength concretes (HSC and UHSC) remain very limited. This paper presents the results of an experimental study on the compressive behavior of circular HSC- and UHSC-filled fiber reinforced polymer (FRP) tubes (HSCFFTs and UHSCFFTs). A total of 24 aramid fiber made CFFTs were tested under uniaxial compression to investigate the influences of concrete strength, amount of confinement and manufacturing method of FRP tubes. The influence of tube manufacturing method was investigated with specimens manufactured with either automated filament winding or manual wet lay-up techniques. In this paper the experimentally recorded stress-strain relationships are presented graphically and key experimental outcomes discussed. The results indicate that the manufacturing method of the FRP tubes significantly influence the compressive behavior of CFFTs.
28
Sui, Lili, Yanlei Liu, Zhongfeng Zhu, Biao Hu, Cheng Chen, and Yingwu Zhou. "Seismic Performance of LRS-FRP–Concrete–Steel Tubular Double Coupling Beam." Applied Sciences 11, no. 5 (February 25, 2021): 2024. http://dx.doi.org/10.3390/app11052024.
Full textAbstract:
To improve the ductility and seismic performance of a double coupling beam, the authors applied a polyethylene terephthalate (PET) sheet and steel tube to form fiber-reinforced polymer (FRP)–concrete–steel double-skin tubular (DST) composite coupling beams. A low-cyclic reversed experimental program was carried out which factored in the member form, steel tube diameter, and construction methods. The results indicate that the ductility and energy dissipation performance of double coupling beams—whether wrapped with a PET-FRP sheet or surrounded by an FRP–concrete–steel DST composite system—is a substantial improvement over the traditional reinforced-concrete double coupling beam (RC-DCB). The ductility coefficient and accumulated energy dissipation of the DST-DCB members improved above 170% and 2300%, respectively. These percentages compare to the RC-DCB and are based on the rupture of a PET-FRP sheet. The results are similar to those of the large rupture strain double coupling beam (LRS-DCB). Meanwhile, the external wrapped PET-FRP sheet does not affect the initial stiffness and peak strength of the RC-DCB. Relatively, the inner steel tube will improve the initial stiffness, yielding strength, and peak strength. DST-DCB members still have considerable deformability after 85% of peak strength since the external PET-FRP sheet provided an effective constraint effect on the core concrete and the inner steel tube could bear excellent shear deformation.
29
Miao, Kunting, Yang Wei, Xi Zhang, Kaiqi Zheng, and Fenghui Dong. "Performance of Circular Concrete-Filled FRP-Grooved Steel Composite Tube Columns under Axial Compression." Polymers 13, no. 21 (October 22, 2021): 3638. http://dx.doi.org/10.3390/polym13213638.
Full textAbstract:
A new structure termed “concrete-filled FRP-grooved steel composite tube (CFGCT) column” is proposed, which is composed of a stress-released steel tube (i.e., grooved steel tube), fiber-reinforced polymer (FRP) and concrete. Axial load tests were carried out on twenty-four specimens to investigate the constraint effect of this structure. Three main experimental variables were considered: the steel tube thickness, the FRP type, and the FRP layer. The failure modes, stress-strain relationships and the effect of the main experimental variables were discussed. The stress-strain curves of this new structure are composed of an initial linear part, a nonlinear transition part, a strengthening part and a residual part. The test results demonstrate that the bearing capacity of the structure was improved, and that the mechanical mechanism of the structure was simplified due to the stress-released grooves. Based on the test results and previous studies, formulas for calculating the ultimate stress (fcu), ultimate strain (εcu), peak stress (fcc) and peak strain (εcc) were proposed. In addition, models for predicting the stress-strain curves of CFGCT columns were put forward, and the models could precisely simulate the stress-strain curve of this new composite structure. Hence, this study indicates that a structure composed of FRP and stress-released steel tube can effectively constrain concrete.
30
Idris, Yunita, and Togay Ozbakkloglu. "Behavior of High-Strength Concrete-Filled FRP Tube Columns under Simulated Seismic Loading: An Experimental Study." Advanced Materials Research 743 (August 2013): 39–44. http://dx.doi.org/10.4028/www.scientific.net/amr.743.39.
Full textAbstract:
This paper reports on part of an ongoing experimental program at The University of Adelaide on the seismic behavior of high-strength concrete (HSC)-filled fiber reinforced polymer (FRP) tubes (HSCFFTs). The results from three square concrete-filled FRP tube (CFFT) columns that were tested under combined constant axial compression and reversed-cyclic lateral loading are presented. The main parameters of the experimental study included the axial load level, concrete strength, and FRP tube corner radius. The results indicate that square HSCFFT columns are capable of developing very high inelastic deformation capacities under simulated seismic loading. The results also indicate that increasing the corner radius beyond a certain threshold value provides no increase in column lateral drift capacities. It was observed that column deformability decreased with an increase in axial load level (P/Po) and concrete compressive strength (fc). The results of the experimental program are presented together with a discussion on the influence of the main parameters on the seismic behavior of CFFT columns.
31
Wang, Yanlei, Guipeng Chen, Baolin Wan, and Baoguo Han. "Compressive Behavior of Circular Sawdust-Reinforced Ice-Filled Flax FRP Tubular Short Columns." Materials 13, no. 4 (February 20, 2020): 957. http://dx.doi.org/10.3390/ma13040957.
Full textAbstract:
Sawdust-reinforced ice-filled flax fiber-reinforced polymer (FRP) tubular (SIFFT) columns are newly proposed to be used as structural components in cold areas. A SIFFT column is composed of an external flax FRP tube filled with sawdust-reinforced ice. The compressive behavior of circular SIFFT short columns was systematically investigated. Four types of short columns with circular sections, including three plain ice specimens, three sawdust-reinforced ice specimens (a mixture of 14% sawdust and 86% ice in weight), nine plain ice-filled flax FRP tubular (PIFFT) specimens and nine SIFFT specimens, were tested to assess the concept of the innovative composite columns. The test variables were the thickness of flax FRP tubes and the type of ice cores. The test results indicated that the lateral dilation and the development of cracks of the ice cores were effectively suppressed by outer flax FRP tubes, thus causing a considerable enhancement in the compressive strength. Moreover, the compressive behavior, energy-absorption capacity, and anti-melting property of sawdust-reinforced ice cores were better than those of plain ice cores confined by flax FRP tubes with the same thicknesses. The proposed equations for estimating ultimate bearing capacities of PIFFT and SIFFT short columns were shown to provide reasonable and accurate predictions.
32
van Loon, R. R. L. (Rick), Ester Pujadas-Gispert, S. P. G. (Faas) Moonen, and Rijk Blok. "Environmental Optimization of Precast Concrete Beams Using Fibre Reinforced Polymers." Sustainability 11, no. 7 (April 11, 2019): 2174. http://dx.doi.org/10.3390/su11072174.
Full textAbstract:
Increasing importance is being attached to materials in the life-cycle of a building. In the Netherlands, material life-cycle assessments (LCA) are now mandatory for almost all new buildings, on which basis the building is then awarded a building environmental performance or MPG [Milieuprestatie Gebouwen] score. The objective of this study is to reduce the environmental–economic (shadow) costs of precast reinforced concrete (RC) beams in a conventional Dutch office building, thereby improving its MPG score. Two main optimizations are introduced: first, the amount of concrete is reduced, designing a cavity in the cross-section of the beam; second, part of the reinforcement is replaced with a fibre reinforced polymer (FRP) tube. The structural calculations draw from a combination of several codes and FRP recommendations. Hollow FRP-RC beams (with an elongated oval cavity), and flax, glass, and kenaf fibre tubes yielded the lowest shadow costs. In particular, the flax tube obtained shadow costs that were 39% lower than those of the hollow RC beam (with an elongated oval cavity); which also contributed to decreasing the shadow costs of other building components (e.g., facade), thereby reducing the MPG score of the building. However, this study also shows that it is important to select the right type of FRP as hemp fibre tubes resulted in a 98% increase in shadow costs.
33
Abdulla, Nwzad Abduljabar. "Strength of Concrete-Filled Plastic Tube Stub Columns Using a Normalized Stiffness Approach." Advanced Materials Research 1163 (April 2021): 174–89. http://dx.doi.org/10.4028/www.scientific.net/amr.1163.174.
Full textAbstract:
The polymeric plastic tube can encase concrete and provide an external shell for confining and insulating concrete core from the impact of the surrounding environment. The effect of the tube and concrete strength on the concrete-filled plastic tubes (CFPT) stub columns specimens was investigated. Test results show that the tube provides passive confinement to the concrete core, which increases both the maximum peak load and the ultimate strain capacities. However, the tube has low stiffness, which affects its confinement capacity and hindrance its applications for structural use. To examine the role of tube stiffness and express the strength of a concrete-filled plastic tube, a previously proposed normalized stiffness approach for both active and passive confinement of FRP-confined concrete was adopted for the present study. From the perspective of stiffness and to better understand the behavior of CFPT specimens under uniaxial compression loads, a database of recent studies were assembled combined with the results of the present study. Several existing strength models for FRP-confined concrete were also used to predict the mechanical strength of CFPT. Two models were proposed with good predictions of the experimental results of the database.
34
Li, Guoqiang, Su-Seng Pang, and Samuel I. Ibekwe. "FRP tube encased rubberized concrete cylinders." Materials and Structures 44, no. 1 (April 27, 2010): 233–43. http://dx.doi.org/10.1617/s11527-010-9622-8.
Full text
35
Louk Fanggi, Butje Alfonsius, and Togay Ozbakkloglu. "Influence of Inner Steel Tube Diameter on Compressive Behavior of Square FRP-HSC-Steel Double-Skin Tubular Columns." Advanced Materials Research 1119 (July 2015): 688–93. http://dx.doi.org/10.4028/www.scientific.net/amr.1119.688.
Full textAbstract:
FRP-concrete-steel double-skin tubular columns (DSTCs) are a new form composite column system that effectively combines the advantages of the constituent materials. The performance of this column system has been experimentally investigated in a number of recent studies. However, apart from a single study reported on square DSTCs, all of the existing studies have been concerned with DSTCs with circular external tubes. This paper reports on part of an ongoing experimental program at the University of Adelaide on FRP-concrete-steel composite columns. The results from 12 square hollow and concrete-filled DSTCs and six companion hollow concrete-filled FRP tubes (H-CFFTs) that were tested under axial compression are presented. Results of the experimental study indicate that hollow DSTCs with larger inner steel tube diameters develop similar ultimate axial stresses to but significantly larger axial strains than companion DSTCs with smaller inner steel tubes. The results also show that, in concrete-filled DSTCs with similar Ds/ts ratios, an increase in the steel tube diameter leads to an increase in both axial stress and strain of concrete. It was observed that H-CFFTs perform significantly worse than both hollow and filled DSTCs under axial compression, and their behavior further degrades with an increase in the diameter of their inner voids.
36
Louk Fanggi, Butje Alfonsius, and Togay Ozbakkloglu. "Effect of Inner Steel Tube Cross-Sectional Shape on Compressive Behavior of Square FRP-Concrete-Steel Double-Skin Tubular Columns." Applied Mechanics and Materials 752-753 (April 2015): 578–83. http://dx.doi.org/10.4028/www.scientific.net/amm.752-753.578.
Full textAbstract:
Recently, a new type of composite system was proposed in the form of fibre reinforced polymer (FRP)-concrete-steel double-skin tubular columns (DSTCs). The performance of this column system, which consists of an outer tube made of FRP and an inner tube made of steel, has been experimentally investigated in a number of studies. However, apart from a single study reported on square DSTCs, all of the existing studies have been concerned with DSTCs with circular external tubes. This paper reports on part of an ongoing experimental program at the University of Adelaide that was aimed at addressing this research gap. The effect of cross-sectional shape of inner steel tube on compressive behaviour of square DSTCs was investigated through the test of 16 hollow and concrete-filled DSTCs. The result of the experimental study indicate that concrete in hollow DSTCs with circular inner steel tubes develop significantly larger ultimate axial stresses and strains than concrete in companion hollow DSTCs with square inner steel tubes. On the other hand, the results also indicate that the presence of a concrete-filling inside inner steel tubes results in a significant improvement in the behavior of DSTCs with square inner steel tubes.
37
Fam, Amir, and Britton Cole. "Tests on reinforced-concrete-filled, fiber-reinforced-polymer circular tubes of different shear spans." Canadian Journal of Civil Engineering 34, no. 3 (March 1, 2007): 311–22. http://dx.doi.org/10.1139/l06-104.
Full textAbstract:
This study examines the shear behavior of concrete-filled glass-fiber-reinforced-polymer (GFRP) tubes (CFFTs) reinforced with either steel or fiber-reinforced-polymer (FRP) longitudinal rebar. To evaluate the contribution of the GFRP tubes, control specimens with and without steel spirals, instead of the tubes, were also tested. Shear span-to-depth ratios (a/D) of 1 and 2 were considered in 14 three-point bending tests. CFFT specimens with a/D = 1 failed in shear by diagonal tension failure of the concrete core and tube, whereas those with a/D = 2 failed mostly in flexure. Control specimens failed in shear at both a/D = 1 and a/D = 2. The shear strength of CFFT beams was substantially higher than that of control specimens but was dependent on rebar type and size. Some slip occurred between the concrete core and both the GFRP tube and the rebar. It is concluded that shear failure may occur in reinforced CFFTs at a/D ≤ 2. Despite the shear failure of steel-reinforced CFFTs at a/D = 1, the measured moments at failure were only 9% lower than their respective ultimate flexural strengths. A simplified strut-and-tie model was developed, and it showed reasonable agreement with experimental results.Key words: concrete-filled glass-fiber-reinforced-polymer tube (CFFT), concrete-filled, fiber-reinforced polymer (FRP), rebar, shear span, shear strength, tube, strut-and-tie model.
38
Xu, Xian, Yudong Han, Kaiyu Zhang, Delong Chen, Haiping Wu, and Jincheng Wang. "Research on Performance of Vertical FRP Concrete Members." Academic Journal of Science and Technology 2, no. 3 (September 8, 2022): 98–99. http://dx.doi.org/10.54097/ajst.v2i3.1533.
Full textAbstract:
In this paper, the theoretical research on the mechanical properties of FRP concrete vertical stressed members is described. The research progress on the mechanical properties of FRP concrete columns is summarized from three aspects: types of fiber-reinforced composites, applications in civil engineering and development prospects. Finally, the advantages of mechanical properties of FRP concrete column are studied by comparing with concrete filled steel tube column, and the further research direction of FRP concrete column is supplemented.
39
Mohamed, Hamdy M., and Radhouane Masmoudi. "Deflection Prediction of Steel and FRP-Reinforced Concrete-Filled FRP Tube Beams." Journal of Composites for Construction 15, no. 3 (June 2011): 462–72. http://dx.doi.org/10.1061/(asce)cc.1943-5614.0000172.
Full text
40
Wang, Ji Zhong, Lu Cheng, and Xin Pei Wang. "Experimental Research of FRP Composite Tube Confined Steel-reinforced Concrete Stub Columns Under Axial Compression." E3S Web of Conferences 38 (2018): 03035. http://dx.doi.org/10.1051/e3sconf/20183803035.
Full textAbstract:
A new column of FRP composite tube confined steel-reinforced concrete (FTCSRC) column was proposed. This paper elaborates on laboratorial and analytical studies on the behavior of FCTSRC columns subjected to axial compressive load. Eight circular FTCSRC stub columns and one circular steel tube confined concrete (STCC) stub column were tested to investigate the failure mode and axial compression performance of circular FTCRSC columns. Parametric analysis was implemented to inquire the influence of confinement material (CFRP-steel tube or CFRP-GFRP tube), internal steel and CFRP layers on the ultimate load capacity. CFRP-steel composite tube was composed of steel tube and CFRP layer which was wrapped outside the steel tube, while CFRP-GFRP composite tube was composite of GFRP tube and CFRP layer. The test results indicate that the confinement effect of CFRP-steel tube is greatly superior to CFRP-GFRP tube. The ductility performance of steel tube confined high-strength concrete column can be improved obviously by encasing steel in the core concrete. Furthermore, with the increase in the layers of FRP wraps, the axial load capacity increases greatly.
41
Uesugi, Kaoru, Keizo Nishiyama, Koki Hirai, Hiroaki Inoue, Yoichi Sakurai, Yoji Yamada, Takashi Taniguchi, and Keisuke Morishima. "Survival Rate of Cells Sent by a Low Mechanical Load Tube Pump: The “Ring Pump”." Micromachines 11, no. 4 (April 23, 2020): 447. http://dx.doi.org/10.3390/mi11040447.
Full textAbstract:
A ring pump (RP) is a useful tool for microchannels and automated cell culturing. We have been developing RPs (a full-press ring pump, FRP; and a mid-press ring pump, MRP). However, damage to cells which were sent by the RP and the MRP was not investigated, and no other studies have compared the damage to cells between RPs and peristaltic pumps (PPs). Therefore, first, we evaluated the damage to cells that were sent by a small size FRP (s-FRP) and small size MRPs (s-MRPs; gap = 25 or 50 μm, respectively). “Small size” means that the s-FRP and the s-MRPs are suitable for microchannel-scale applications. The survival rate of cells sent by the s-MRPs was higher than those sent by the s-FRP, and less damage caused by the former. Second, we compared the survival rate of cells that were sent by a large size FRP (l-FRP), a large size MRP (l-MRP) (gap = 50 μm) and a PP. “Large size” means that the l-FRP and the l-MRP are suitable for automated cell culture system applications. We could not confirm any differences among the cell survival rates. On the other hand, when cells suspended in Dulbecco’s phosphate-buffered saline solution were circulated with the l-MRP (gap = 50 μm) and the PP, we confirmed a difference in cell survival rate, and less damage caused by the former.
42
Zhou, Ying Wu, Li Li Sui, and Feng Xing. "Reliability Studies on Concrete Filled FRP Tube Columns Using Different Design Code Models." Applied Mechanics and Materials 405-408 (September 2013): 735–39. http://dx.doi.org/10.4028/www.scientific.net/amm.405-408.735.
Full textAbstract:
The paper presents an in-deep reliability study on concrete filled FRP tube columns using four well-known design codes which include the ACI 4402R-08, the CNR-DT200, UK code (TR55) , and the Chinese code. Monte Carlo method is utilized to calculate the reliability index of the column. The simulation results reveal that the reliability index depends heavily on the design code and the ACI 4402R-08 design code is found to be the most reliable one for the design of concrete filled FRP tube columns. The variation of the unconfined concrete strength has remarkable influences on the reliability of the column while the variation of the FRP tensile strength can hardly affect the reliability. Consequently, it is concluded that the partial safety factor for concrete or the FRP proposed in existing design codes may be suitably enhanced in order to make up the reliability loss due to the increment of the variation of concrete.
43
Park, Joon Seok, Seong Sik Lee, Jeong Hun Nam, In Kyu Kang, Dong Jun An, and Soon Jong Yoon. "Load Carrying Capacity of Hybrid FRP-Concrete Composite Pile." Advanced Materials Research 250-253 (May 2011): 1165–72. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.1165.
Full textAbstract:
In the study, in order to enhance the durability and constructability of the pile foundation, hybrid FRP-concrete composite pile is developed and its applicability considering construction is discussed. Existing FRP-concrete composite pile is consisted of concrete pile and filament winding FRP wound outside of the pile. To improve the axial and transverse load carrying capacities longitudinal reinforcement is also needed additionally, and hence a new type hybrid FRP-concrete composite pile (HCFFT) is suggested. A new type HCFFT which is composed of pultruded FRP, filament winding FRP, and concrete filled inside of the FRP tube is proposed to improve compressive strength as well as flexural strength of the HCFFT pile. The load carrying capacity of proposed HCFFT pile is evaluated and discussed based on the result of experimental and theoretical investigations.
44
Degefa Zewdu, Brhanu, and Temesgen Wondimu Aure. "Numerical Investigation of Carbon Fiber Reinforced Polymer Confined Concrete-Filled Steel Tube Columns under Eccentric Load." Advances in Civil Engineering 2022 (May 14, 2022): 1–15. http://dx.doi.org/10.1155/2022/4807436.
Full textAbstract:
Recently, Fiber Reinforced Polymer (FRP) materials have emerged as a viable alternative to confined columns due to their high ultimate tensile strength to weight ratio and corrosion resistance under harsh and corrosive environments. Many previous studies were focused on the confining capability of FRP on concentric axial loads. This study presents a nonlinear finite element (FE) investigation of the effects of the thickness of Carbon Fiber Reinforced Polymer (CFRP), the thickness of steel tube, cross-sectional shape, and slenderness effect of an FRP confined concrete-filled steel tube (FCCFST) column under eccentric load. The FE model was validated by comparing the results with experimental data available in the literature, and good agreement was found. From the FE results, it was found that the steel tube and CFRP confinement improved the load resistance capacity by about 34% to 39%, and the axial shortening of the column at the peak load, from 136% to 57%, in rectangular and circular cross-sections, respectively. The efficiencies of steel tube and CFRP confinement first increase with an increasing eccentricity of the axial load and then start to decrease as the failure mode of the column changes to stability.
45
Vincent, Thomas, and Togay Ozbakkaloglu. "Lateral Strain-to-Axial Strain Model for Laterally Prestressed Concrete-Filled FRP Tubes." Key Engineering Materials 729 (February 2017): 134–38. http://dx.doi.org/10.4028/www.scientific.net/kem.729.134.
Full textAbstract:
Concrete-filled FRP tube (CFFT) columns have recently gained significant research attention, with a number of experimental studies identifying significant benefits of using high-strength concrete (HSC) to produce high-performance CFFT columns. A recent experimental investigation revealed that prestressing the fibers in the fiber reinforced polymer (FRP) confining shell leads to significant improvements in the axial compressive behavior of HSC-CFFTs. This paper reports the findings from an analytical investigation into the lateral strain-to-axial strain relationship for prestressed HSC-CFFTs. This understanding of the lateral strain-to-axial strain relationship is of particular importance for prestressed CFFTs due to the influence of the additional lateral prestrain. Initially a database that consists of 23 aramid FRP- (AFRP) confined HSC cylindrical specimens with lateral prestress of up to 7.3 MPa is presented. Based on close examination of the experimentally recorded data, an expression to predict the lateral strain-to-axial strain relationship for prestressed HSC-CFFTs is proposed. The comparison of the proposed model predictions with the experimental test results for specimens prepared with prestressed FRP tubes shows good agreement.
46
Fanggi, Butje Alfonsius Louk, and Togay Ozbakkaloglu. "Influence of Inner Steel Tube Properties on Compressive Behavior of FRP-HSC-Steel Double-Skin Tubular Columns." Applied Mechanics and Materials 438-439 (October 2013): 701–5. http://dx.doi.org/10.4028/www.scientific.net/amm.438-439.701.
Full textAbstract:
This paper reports on part of an ongoing experimental program at The University of Adelaide on FRP-concrete-steel composite columns. A total of eight high-strength concrete double-skin tubular columns (DSTCs) were tested under axial compression. The column parameters examined included the diameter, thickness, and shape of inner steel tube. The results of the experimental study show that increasing the inner steel tube diameter leads to an increase in the ultimate axial stress and strain of concrete in DSTCs. The results also show that increasing inner steel tube thickness leads to an increase in the ultimate axial stress and strain of DSTCs. Furthermore, it is observed that concrete inside DSTCs with square inner steel tubes is not confined as effectively as concrete inside DSTCs with circular inner steel tubes.
47
Ozbakkloglu, Togay. "Concrete-Filled FRP Tubes: New Forms for Improved Confinement Effectiveness." Applied Mechanics and Materials 256-259 (December 2012): 657–61. http://dx.doi.org/10.4028/www.scientific.net/amm.256-259.657.
Full textAbstract:
This paper reports on the development and testing of a new concrete-filled fiber reinforced polymer (FRP) tube (CFFT) system. The CFFT system was designed to enhance the effectiveness of rectangular FRP tubes in confining concrete. The technique used in the development of the CFFT system involved the incorporation of an internal FRP panel as an integral part of the CFFT. The performance of the system was investigated experimentally through axial compression tests of six unique CFFTs. The results of the experimental study indicate that the new CFFT system presented in this paper offer significantly improved performance over conventional CFFTs with similar material and geometric properties. Examination of the test results have led to a number of significant conclusions in regards to confinement effectiveness of each new CFFT system. These results are presented and a discussion is provided on the parameters that influenced the compressive behavior of the new CFFT system.
48
Park, Joon Seok, In Kyu Kang, Jong Hwa Park, Joo Kyung Park, Hong Taek Kim, and Soon Jong Yoon. "An Experimental Investigation on the Structural Behavior of FRP-Concrete Composite Compression Members." Materials Science Forum 654-656 (June 2010): 2644–47. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.2644.
Full textAbstract:
In construction industries, new construction materials are needed to overcome some problems associated with the use of conventional construction materials due to the change of environmental and social requirements. Accordingly, the requirements to be satisfied in the design of civil engineering structures are diversified. As a new construction material in the civil engineering industries, fiber reinforced polymeric plastic (FRP) has a superior corrosion resistance, high specific strength/stiffness, etc. Therefore, such properties can be used to mitigate the problems associated with the use of conventional construction materials. Nowadays, new types of bridge piers and marine piles are being studied for new construction. They are made of concrete filled fiber reinforced polymeric plastic tubes (CFFT). In this paper, a new type of FRP-concrete composite pile which is composed of reinforced concrete filled FRP tube (RCFFT) is proposed to improve compressive strength as well as flexural strength of an RCFFT. The load carrying capacity of proposed RCFFT is discussed based on the result of experimental and analytical investigations.
49
Li, Guoqiang, Sadi Torres, Walid Alaywan, and Christopher Abadie. "Experimental Study of FRP Tube-encased Concrete Columns." Journal of Composite Materials 39, no. 13 (July 2005): 1131–45. http://dx.doi.org/10.1177/0021998305048743.
Full text
50
Mohamed, Hamdy M., and Radhouane Masmoudi. "Flexural strength and behavior of steel and FRP-reinforced concrete-filled FRP tube beams." Engineering Structures 32, no. 11 (November 2010): 3789–800. http://dx.doi.org/10.1016/j.engstruct.2010.08.023.
Full text