Dissertations / Theses on the topic 'High strength concrete Fire-testing'
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Mitchell, Andrew Douglass. "Shear friction behavior of high-strength concrete." Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/19274.
Full textEzekiel, Samson. "Fire resistance simulation for high strength reinforced concrete." Thesis, London South Bank University, 2015. http://researchopen.lsbu.ac.uk/2084/.
Full textZaina, Mazen Said Civil & Environmental Engineering Faculty of Engineering UNSW. "Strength and ductility of fibre reinforced high strength concrete columns." Awarded by:University of New South Wales. School of Civil and Environmental Engineering, 2005. http://handle.unsw.edu.au/1959.4/22054.
Full textYosefani, Anas. "Flexural Strength, Ductility, and Serviceability of Beams that Contain High-Strength Steel Reinforcement and High-Grade Concrete." PDXScholar, 2018. https://pdxscholar.library.pdx.edu/open_access_etds/4402.
Full textDabbagh, Hooshang Civil & Environmental Engineering Faculty of Engineering UNSW. "Strength and ductility of high-strength concrete shear walls under reversed cyclic loading." Awarded by:University of New South Wales. School of Civil and Environmental Engineering, 2005. http://handle.unsw.edu.au/1959.4/27467.
Full textMeyer, Karl F. "Transfer and development length of 06-inch diameter prestressing strand in high strength lightweight concrete." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/20727.
Full textIslam, Md Shahidul. "Shear capacity and flexural ductility of reinforced high- and normal-strength concrete beams." Thesis, Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B1766536X.
Full textReutlinger, Christopher George. "Direct pull-out capacity and transfer length of 06-inch diameter prestressing strand in high-performance concrete." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/19026.
Full textShams, Mohamed Khalil. "Time-dependent behavior of high-performance concrete." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/20682.
Full textChau, Siu-lee, and 周小梨. "Effects of confinement and small axial load on flexural ductility of high-strength reinforced concrete beams." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B31997661.
Full textWong, Hin-cheong Henry, and 黃憲昌. "Effects of water content, packing density and solid surface area on cement paste rheology." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B39326032.
Full textWong, Kong-yeung, and 黃剛揚. "Development of high strength concrete for Hong Kong and investigation of their mechanical properties." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1996. http://hub.hku.hk/bib/B31213765.
Full textInwood, Michael. "Review of the New Zealand Standard for Concrete Structures (NZS 3101) for High Strength and Lightweight Concrete Exposed to Fire." University of Canterbury. Civil Engineering, 1999. http://hdl.handle.net/10092/8276.
Full textLokuge, W. P. (Weena Priyanganie) 1967. "Stress-strain behaviour of confined high strength concrete under monotonically increasing and cyclic loadings." Monash University, Dept. of Civil Engineering, 2003. http://arrow.monash.edu.au/hdl/1959.1/9425.
Full textKirchhof, Larissa Degliuomini. "Estudo teórico-experimental da influência do teor de umidade no fenômeno de spalling explosivo em concretos expostos a elevadas temperaturas." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2010. http://hdl.handle.net/10183/32002.
Full textIn the last years, the utilization of high-strength concrete (HSC) in the construction industry, with compressive strength grades greater than 40 MPa, has become wide spread due to remarkable characteristics of durability and load bearing capacity. However, the increased use of HSC has raised concerns regarding the behaviour of such concretes in fire. Evidences which were collected from structures exposed to the effects of fires, like Channel Tunnel and Mont Blanc Tunnel, have indicated that there is a possibility of the occurrence of explosive spalling in this condition. The phenomenon causes serious damages to the material and raises its thermal degradation in a significant way. This occurs because of its low porosity and permeability that contribute for the vapour pressure build-up in the pores, generating stresses which can exceed tensile strength of the material. The probability and severity of spalling process depend on a large number of inter-dependent factors that influence the behaviour of HSC in an unexpected manner. There is a consensus that the moisture content is one of the principal factors of the occurrence of explosive spalling. Recent investigations have demonstrated that spalling tends to occur only when the moisture content in the pores of concrete is elevated. Although fire is considered an exceptional event, the seriousness of spalling in concrete structures justifies the investigation of conditions in that the phenomenon can be happen and the implementation of preventive measures. In spite of the recent advances about the spalling process in HSC at high temperatures, there is still a lack of information in relation to the critical combinations of factors which affect the spalling occurrence. This work intends to help overcoming this lack of knowledge from the experimental data analysis with the purpose of establishing some critical conditions which collaborate in the spalling process as well as investigating the residual mechanical properties and changes in the microstructure of different concrete grades submitted to high temperatures. In addition, the experimental data are used to validate the proposition of a simplified model of spalling which was developed with the objective to take into account the effects of spalling in the thermo-mechanical analysis. This is an important need to complement the fire analysis of concrete structures. The spalling model was incorporated in the VULCAN software to simulate the phenomenon occurrence in a concrete beam exposed to fire. The results shown that the loss of mass in the beam cross-section, caused by spalling, reduces substantially its required time of fire resistance whereas it accelerates the damage in the concrete and aids the reduction of load bearing capacity of structural element. In conclusion, it is essential to consider the possibility of concrete spalling mainly in concrete grades greater than 40 MPa that present a saturation degree higher than 90%.
Britez, Carlos Amado. "Avaliação de pilares de concreto armado colorido de alta resistência, submetidos a elevadas temperaturas." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/3/3146/tde-31052011-170216/.
Full textIn spite of the several factors that influence the behavior of concrete columns under fire conditions, there is a belief among the research community, that the high-strength concrete is more susceptible to explosive spalling than normal-strength concrete. This doubt, in part, is attributed to the small unreinforced concrete samples (specimens) used in experimental programs, to evaluate the fire resistance of structural concrete. On the other hand, relevant aspects as the coarse aggregate type used in the concrete mixture, as well as the age and content moisture (relative humidity) are not considered in the researches and sometimes simply omitted. This research presents a pioneer experimental program, carried out in Brazil on a high strength colored reinforced concrete column (HSCC) with 200cm high, eight yearsold, fc,8years of 140MPa, basalt coarse aggregate, cross section of 700mm x 700mm, tested under no load and with three faces exposed to a standard fire curve ISO 834 for a period of 180min (3h). The column prototype is a replica of the actual columns of the e-Tower Building, constructed in 2002 in São Paulo city, Brazil. The results demonstrated concrete column integrity under experimental fire and that the iron oxide pigments can work as an excellent natural thermometer, contributing in the evaluation of the structure post-fire.
Ghasemi, Sahar. "Innovative Modular High Performance Lightweight Decks for Accelerated Bridge Construction." FIU Digital Commons, 2015. http://digitalcommons.fiu.edu/etd/2248.
Full textLeite, Junior Geraldo Silveira. "Colunas mistas esbeltas de aço preenchidas com concreto de alta resistencia em temperatura ambiente e em situação de incendio." [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/258263.
Full textTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Civil, Arquitetura e Urbanismo
Made available in DSpace on 2018-08-13T04:09:02Z (GMT). No. of bitstreams: 1 LeiteJunior_GeraldoSilveira_D.pdf: 5865663 bytes, checksum: d49ee862fe97f6a26434a033e8947468 (MD5) Previous issue date: 2009
Resumo: Neste trabalho, foi investigado em laboratório o efeito do fogo em colunas esbeltas de aço sem preenchimento e preenchidas com concreto de alta resistência que foram submetidas a três diferentes níveis de carga (30%, 50% e 70%). O nível de carga é a razão entre a carga axial a ser aplicada em situação de incêndio e a carga última obtida no ensaio da coluna à temperatura ambiente. Assim sendo, colunas esbeltas de aço sem preenchimento e preenchidas com concreto de alta resistência também foram investigadas à temperatura ambiente, uma vez que os resultados obtidos nessa situação serviram de referência para o estabelecimento das cargas axiais que foram aplicadas em situação de incêndio. Ao todo, foram investigadas 32 colunas esbeltas, sendo 4 sem preenchimento e 4 preenchidas com concreto de alta resistência em temperatura ambiente. Além dessas colunas, 12 foram ensaiadas sem preenchimento e 12 preenchidas com concreto de alta resistência em situação de incêndio. Os valores experimentais de carga última obtidos com as colunas de aço sem preenchimento e preenchidas com concreto de alta resistência à temperatura ambiente e em situação de incêndio foram comparados a aqueles determinados a partir da formulação proposta respectivamente pelo EUROCODE 3 (prEN 1993-1-1:2001), EUROCODE 4 (prEN1994-1-1:2003), EUROCODE 3 (prEN 1993-1-2:2002) e pelo EUROCODE 4 (prEN1994-1-2:2002), além de outras propostas de pesquisadores que foram encontradas na escassa literatura sobre o assunto. Como parte numérica, os resultados obtidos para as colunas mistas em situação de incêndio foram comparados a aqueles determinados por meio da utilização de dois softwares, que foram o SuperTempCalc e o PotFire. Ao final, observou-se que o preenchimento das colunas esbeltas de aço com concreto de alta resistência, propiciou melhorias significativas no tempo de resistência ao fogo dessas colunas, porém, comprovou-se que, de forma geral, somente as colunas em situação de incêndio que atingiram o tempo mínimo de resistência ao fogo, estipulado tanto no EUROCODE 4 (prEN 1994-1-2:2002), quanto na NBR 14432 (2000) em 30 minutos, foram as que apresentaram os resultados mais satisfatórios.
Abstract: In this work, it was investigated in laboratory the effect of fire in slender steel columns unfilled and filled with high strength concrete submitted to three different levels of axial load (30%, 50% and 70%), which is the relation between the axial load to be applied in fire situation and the ultimate load obtained in the column test to room temperature. So, slender steel columns unfilled and filled with high strength concrete were also investigated to room temperature, once the results obtained in this situation have served of reference to the establishment of axial loads applied in fire situation. Altogether 32 slender columns were tested, being 4 unfilled and 4 filled with high strength concrete in room temperature. Besides these columns, 12 were tested filled with high strength concrete in fire situation and 12 unfilled. The experimental values of ultimate load obtained with steel columns unfilled and filled with high strength concrete to room temperature and in fire situation were compared to those determinated from the formulation proposed by EUROCODE 3 (prEN 1993-1-1:2001), EUROCODE 4 (prEN1994-1-1:2003), EUROCODE 3 (prEN 1993-1-2:2002) and EUROCODE 4 (prEN1994-1-2:2002), besides others researchers' proposals found in scarce literature about the subject. As a numeric part, the results obtained for mixed columns in fire situation were compared to those determinated by means of using two softwares, the SuperTempCalc and the PotFire. At the end, it was observed that the filling of slender steel columns with high strength concrete have provided significant improvement in the time of resistance to fire in these columns, but it was proved that, in general, only the columns in fire situation which reached the minimum time to fire resistance, stipulated in EUROCODE 4 (prEN 1994-1-2:2002), as in NBR 14432 (2000) in 30 minutes, were the ones that have presented the most satisfactory results.
Doutorado
Estruturas
Doutor em Engenharia Civil
Arakelian, Andrea Katherine. "Strength analysis of bolted shear connections under fire conditions using the finite element approach." Worcester, Mass. : Worcester Polytechnic Institute, 2008. http://www.wpi.edu/Pubs/ETD/Available/etd-122208-145717/.
Full textProcházka, David. "Vytvoření předpokladů pro hodnocení vlastností vysokopevnostních betonů s využitím nedestruktivních metod zkoušení." Doctoral thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-233795.
Full textMaluk, Cristian. "Development and application of a novel test method for studying the fire behaviour of CFRP prestressed concrete structural elements." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/15926.
Full textPessôa, José Renato de Castro. "Análise numérico-experimental de estruturas de concreto com utilização da energia de fraturamento." Universidade do Estado do Rio de Janeiro, 2007. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=780.
Full textA evolução dos concretos utilizados nas últimas décadas deu origem ao Concreto de Alto Desempenho (CAD), que tem, entre suas características, alta resistência à compressão e baixa permeabilidade. Com o desenvolvimento dos produtos químicos utilizados na construção civil, em especial os superplastificantes e superfluidificantes, a utilização desse tipo de concreto tornou-se cada vez mais freqüente pela possibilidade de se obter uma mistura suficientemente trabalhável utilizando-se fatores água/cimento menores do que 0,35. Devido à sua microestrutura mais homogênea, esse tipo de concreto apresenta um comportamento mais frágil do que os concretos convencionais, exigindo uma melhor caracterização do material. A partir do final da década de 70 começou-se a aplicar os conceitos da Mecânica da Fratura para análise do comportamento de estruturas construídas com esse tipo de concreto. Como em algumas situações a resistência nominal de peças de concreto diminui com o aumento de suas dimensões, houve a necessidade de se considerar o efeito de escala das estruturas a fim de se obter níveis de segurança mais adequados no seu dimensionamento, o que justificou a utilização da Mecânica da Fratura. Neste trabalho a energia de fraturamento foi obtida experimentalmente pelo método do trabalho de fraturamento e pelo método do efeito de escala, por meio de ensaios estáveis de flexão de três pontos em amostras de concreto de alto desempenho com entalhe. Foi também desenvolvida a simulação numérica de uma viga com entalhe, analisada pelo método dos elementos finitos e empregando-se na modelagem constitutiva os conceitos da Mecânica da Fratura aplicada ao concreto. As vigas foram moldadas e ensaiadas no Instituto Politécnico do Rio de Janeiro (IPRJ) da Universidade do Estado do Rio de Janeiro (UERJ) na cidade de Nova Friburgo. Os ensaios foram realizados com controle de deslocamento da célula de carga. Foram ensaiadas três séries de 12 vigas, com quatro dimensões diferentes, geometricamente proporcionais, e três amostras para cada dimensão, totalizando 36 vigas. As alturas utilizadas para as vigas foram 38, 76, 152 e 304 mm, e sua espessura foi mantida constante igual a 38 mm. Os corpos de prova cilíndricos, para caracterização da resistência à compressão do concreto, foram moldados no IPRJ e rompidos no laboratório de engenharia civil da UERJ, na cidade do Rio de Janeiro. Os concretos utilizados apresentaram resistência à compressão média de 70 MPa.
The evolution of the concrete mixes used during the last decades gave birth to the High Performance Concrete (HPC), which, among its main characteristics, presents high strength and low permeability. With the development of chemical products used in civil engineering constructions, mainly the superplasticizers, the use of this kind of concrete has become more and more frequent due to the possibility of obtaining a workable mixture with a water/cement ratio lower than 0.35. Due to its more homogeneous microstructure, the HPC presents a more fragile behavior than the conventional concrete, demanding a better characterization of the material. At the end of the 1970s, concepts of the Fracture Mechanics started to be used for the analysis of the structural behavior of concrete structures. As the nominal stress of the material decreases as the size of the structure increases, it became necessary to consider this size effect in the analysis in order to obtain more suitable levels of security. This fact justifies the use of the Fracture Mechanics in the structural analysis of concrete structures. In this work, the fracture energy was experimentally obtained using the work-offracture method and the size effect method by performing three-point bend tests in HPC notched beams. It was also developed a numerical simulation of the tests, performing the analysis through the Finite Element Method and applying the concepts of the Fracture Mechanics of Concrete into the constitutive model. The notched beams were molded and tested at the Polytechnic Institute of the State University of Rio de Janeiro (IPRJ/UERJ), located in the city of Nova Friburgo. The tests were controlled by the vertical displacement of the load cell. Three series of twelve beams with four geometrically similar sizes were tested. Three samples for each size were cast, making an amount of 36 beams. The beams were 38, 76, 152 and 304 millimeters high and the width was kept constant equal to 38 millimeters. To characterize the concrete compression strength, 100x200 millimeters cylinders were molded at the IPRJ and tested at the UERJ civil engineering laboratory in the city of Rio de Janeiro. The tested concretes presented a medium compressive strength of 70 MPa.
Lu, Tien Tsai, and 盧天財. "Study on High Strength Fiber Concrete Slab Exposed to Fire." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/77096362394191645597.
Full text國立交通大學
土木工程系
91
Recently, the use of high strength concrete (HSC) in high rise building was increased significantly. Therefore, the endurance capability of HSC at elevated temperature was an important research topic. Series study were conducted in our campus for HSC at elevated temperature. The study of mechanical behavior of slab at elevated temperature will be included in proposal. The adding of fibers to increase the ductility of HSC will be investigated too. The effect of adding fibers, strength concrete will be tested to compared with the results from HSC. Whole study will be under the guide line of ASTM E119 and ACI216. Simple supported slab with will be studies. The distribution of temperature inside of slab and the deflection of slab will be measured in the progress of tests.
Espinos, A., M. L. Romero, and Dennis Lam. "Fire performance of innovative steel-concrete composite columns using high strength steels." 2016. http://hdl.handle.net/10454/8142.
Full textThis paper presents the results of a numerical investigation on strategies for enhancing the fire behaviour of concrete-filled steel tubular (CFST) columns by using inner steel profiles such as circular hollow sections (CHS), HEB profiles or embedded steel core profiles. A three-dimensional finite element model is developed for that purpose, which is capable for representing the various types of sections studied and the nonlinear behaviour of the materials at elevated temperatures. High strength steel is considered in the numerical model, as a possible way to lengthen the fire endurance. The numerical model is validated against experimental results available in the literature for various types of steel-concrete composite sections using inner steel profiles, obtaining satisfactory results. Based on the developed numerical model, parametric studies are conducted for investigating the influence of the cross-sectional geometry and the steel grade of the inner profiles on the fire performance of these composite columns, for eventually providing some practical recommendations.
劉靖國. "Flexural behaviors of reinforced high-strength concrete beams after exposure to fire." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/57982472816900674919.
Full textJheng, Guan-wei, and 鄭冠威. "Effect of Fire on Compressive Strength of Early Cured High Performance Concrete." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/80688395868400507545.
Full text國立高雄第一科技大學
環境與安全衛生工程研究所
100
This study investigated the effect of high temperature on early cured concrete with and without fly ash (w/c=0.5). Parameters studied included the ratio of fine/coarse aggregates (1:1 and 1.5:1), curing duration (3, 7, 14, 28 and 56 days), exposure temperature (300℃, 450℃, 600℃ and 850℃). After specimens were exposed to the high temperatures, residual compressive strength test (RCS) and ultrasonic pulse velocity test (UPV) were carried out on the next day, 35th day after casting and 21-day recurring. The data shows that the UPV decreased for all specimens after exposed to high temperature, and the reduction was more significant for specimens with higher temperature. Internal structural damage caused by the high temperature lowered their densities. In addition, the RCS of normal concrete significantly rose after the concrete exposed to 450℃. The rise was attributed to the evaporation of free water and crystallization water, and then transportation of moisture in concrete. The high temperatures accelerated hydration at the early stage of concrete. Furthermore, the compressive strength at 450℃ decreased for the fly ash concrete. Because fly ash concrete has low permeability and high density, water vapor did not easily dissipate, increasing the pore pressure and eventually leading the production of microcracks. Additionally, insignificant recovery of the UPV and RCS after post-fire-curing existed. Moisture supply with air-curing to continue and expedite the rehydration reactions was not effective.
Yeh, Ming-Jia, and 葉明家. "The Effects of Fire-Retardant Coating on Strength of Concrete under High Temperature." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/56898374716502358124.
Full text國立屏東科技大學
土木工程系所
98
Student ID: N9633018 Title: The Effects of Fire-Retardant Coating on Strength of Concrete under High Temperature Pages: 49 Name of Institute: National Pingtung University of Science and Technology Name of Department: Department of Civil Engineering Date of Graduation: January 2010 Degree Conferred: Master Name of student: Ming-Jia Yeh Adviser: Dr. Jun-Kai Lu Abstract content: Fire-Retardant Coatings are used wildly in wooden building, steel structures and interior partitions. It is hardly used in concrete structure. The concrete are very popular material for structure in Taiwan. The mechanical behaviors of concrete are changing with respected to the changing of temperature. Present paper investigates the effects of the Fire-Retardant Coating on strength of concrete under high temperature. Three different Fire-Retardant Coatings are investigated. Five different temperatures are discussed in present paper. There are room temperature, 400℃,500℃,600℃,700℃. It is shown that the strength of concrete specimen with Fire-Retardant Coating are high than the strength of concrete specimen without fire-retardant coating. Also, the strength of concrete specimen with different fire-retardant coating is different from each other.
Wu, Miin Chyi, and 吳敏祺. "Factors affect the spalling behavior of high strength concrete in fire and its material properties after fire." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/41229957923159006925.
Full textHUANG, PO-CHIA, and 黃柏嘉. "Seismic Testing of High-Strength Reinforced Concrete Exterior Beam-Column-slab connections." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/49818516948465088936.
Full text國立雲林科技大學
營建工程系
104
To study the degradation of joint shear strength, this paper designed four New RC exterior beam-column connections with slabs and transverse beams covers 2/3 or 3/4 width of the joint face using current codes. Four beam-column connections were made with 70 MPa concrete, SD685 longitudinal reinforcement and SD785 transverse reinforcement. Test results showed that the current ACI 318 code is conservative. The transverse beams which covered 2/3 width of the joint face still had some confining effect to enhance the joint shear strength. Typical pushover analysis use beam-column centerline models with rigid joints, which may get unconservative results. This paper also presents nonlinear modeling of the joint with two equivalent compression struts using a commercial structural analysis tool. Following the recommendations of ASCE 41 and ACI 369, the joint keep elastic if the shear demand is less than the nominal shear strength. This paper propose to model the joint shear failure after beam yielding. Using empirical formula obtained by prior database investigation, the joint nonlinear springs are adjusted according to the prediction of failure mode. The proposed skills can improve the results of pushover analysis and well predict the envelopes for the cyclic loading test results. Further calibration and verification of the modeling parameters are recommended to widely use in practice.
Liu, Wen-hao, and 柳文皓. "Seismic Testing of High-Strength Reinforced Concrete Interior Beam-Colunm-slab connections." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/z9fj97.
Full text國立雲林科技大學
營建工程系
104
For high-rise buildings, columns made of normal-strength reinforced concrete have large cross-sectional dimensions which cannot be accepted by end users. Using high-strength reinforcement and concrete have many advantages, including smaller member sizes, lighter structure elements, lesser steel reinforcement, longer span capability, and more space available for end users. This paper presents experiments of the sub-project “behavior, design, and modeling of new RC frame joints subjected to seismic loading” in the Taiwan New RC Project. Four new RC interior beam-column connections with transverse beams and slabs were tested according to the acceptance criteria for moment frames, evaluating the effect of transverse beams covers 1/2 or 3/4 width of the joint face. The degradation of the joint shear strength is also investigated. Four beam-column connection specimens were made with 100-MPa concrete, SD685 longitudinal reinforcement, and SD785 transverse reinforcement. Two connection specimens have precast concrete units with cast-in-place concrete joint and slabs, while the other two specimens are monolithic beam-column-slab connections. Test results show that the precast beams and columns with cast-in-place concrete joint perform as well as expected for seismic design of moment frames. Test results shows that the 1/2-column-width-wide transverse beams still have partial confinement effect. It is recommended that the nominal joint strength between calculated by linear interpolation between 1.25√(f_c^' ) MPa(15√(f_c^' ) psi) and 1.67√(f_c^' ) MPa(20√(f_c^' ) psi) for transverse beams cover 1/2 and 3/4 width of the column, respectively.
EN, LEE CHEN, and 李承恩. "The Effects of Fire Resistance Materials on Strength of Concrete and Bonding Strength of Rebar under High Temperature." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/69vhk8.
Full text逢甲大學
土木工程學系
107
This study is to investigate the difference in compressive strength and the bonding strength between concrete specimens and specimens coated with fire resistance material under various fire temperatures. There are a total of 84 concrete cylindrical specimens with dimensions of ∅12cm×24cm, in which 21 specimens are embedded with 22 cm length of #4 rebar and 24 specimens with different embedment length of #3 rebar, all with design strength of 245 kgf/〖"cm" 〗^"2" . The experimental parameters include the thickness of fire resistance material coating, fire temperature, and fire exposure duration. The concrete compression test and pullout test of concrete specimens and reinforced concrete specimens are made after the specimens are exposed to fire. From the test results, the compressive strength of concrete cylindrical specimen decreases less as the thickness of fire resistance material increases, with a better fire protection effect. The pullout strength of reinforced concrete specimen drops less as the thickness of fire resistance material increases, with a better bonding strength protection effect. The results also show that the pullout strength of the specimen coated by the fire resistance material increases as the embedment length of rebar increases after being heated, with a better bonding force protection effect.
Wu, Y. F. (Yu-Fei). "Seismic retrofitting of rectangular reinforced concrete columns with partial interaction plating." 2002. http://web4.library.adelaide.edu.au/theses/09PH/09phw9591.pdf.
Full textWu, Y. F. (Yu-Fei). "Seismic retrofitting of rectangular reinforced concrete columns with partial interaction plating / by Yu-Fei Wu." Thesis, 2002. http://hdl.handle.net/2440/21836.
Full textIncludes bibliographical references (leaves 349-374)
xxxix, 416 leaves : ill., plates ; 30 cm.
Thesis (Ph.D.)--University of Adelaide, Dept. of Civil and Environmental Engineering, 2002
Clark, W. S. "Axial load capacity of circular steel tube columns filled with high strength concrete." Thesis, 1994. https://vuir.vu.edu.au/18153/.
Full textHsiao, Cheng-Chieh, and 蕭政杰. "Nondestructive testing and evaluation of the residual strength and material properties of fire-damaged slag concrete." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/26166237827463160812.
Full text國立中興大學
土木工程學系所
99
The effects of the fire on safety and durability of concrete structures is profound. This study focuses on the slag concrete with a slag replacement of 60%, and uses different curing methods under different curing periods after the concrete exposed to high temperature for two hours. This research is to investigate the relationship between residual velocity and residual strength by using the ultrasonic pulse velocity method and the impact-echo method. Furthermore, to explore the relationship among heating temperature and the residual strength ration, residual density ration, the residual Poisson ration, the residual static elastic modulus, residual dynamic elastic modulus of slag concrete under fire damage. According to the experimental results, the reduction in residual strength of slag concrete is significant at the temperature over 600 ℃. And the fire-damaged concrete has a better recovery after water-curing, rather than air curing condition. The two aforementioned methods are used to investigate the relationship between residual velocity and residual compressive strength of fire-damaged concrete under different curing conditions. The result also shows that the relationship for the water curing case is not consistent. This might be attributed to the rehydration and crack-healing process during water-curing. The present study can form a basis for the future application of the stress wave velocity technique for assessment of the engineering properties of the fire-damaged slag concrete.