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Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 29 січня 2023

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Статті в журналах з теми "Prestressed concrete construction Joints"

1

Yan, Xueyuan, Suguo Wang, Canling Huang, Ai Qi, and Chao Hong. "Experimental Study of a New Precast Prestressed Concrete Joint." Applied Sciences 8, no. 10 (October 10, 2018): 1871. http://dx.doi.org/10.3390/app8101871.

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Анотація:
Precast monolithic structures are increasingly applied in construction. Such a structure has a performance somewhere between that of a pure precast structure and that of a cast-in-place structure. A precast concrete frame structure is one of the most common prefabricated structural systems. The post-pouring joint is important for controlling the seismic performance of the entire precast monolithic frame structure. This paper investigated the joints of a precast prestressed concrete frame structure. A reversed cyclic loading test was carried out on two precast prestressed concrete beam–column joints that were fabricated with two different concrete strengths in the keyway area. This testing was also performed on a cast-in-place reinforced concrete joint for comparison. The phenomena such as joint crack development, yielding, and ultimate damage were observed, and the seismic performance of the proposed precast prestressed concrete joint was determined. The results showed that the precast prestressed concrete joint and the cast-in-place joint had a similar failure mode. The stiffness, bearing capacity, ductility, and energy dissipation were comparable. The hysteresis curves were full and showed that the joints had good energy dissipation. The presence of prestressing tendons limited the development of cracks in the precast beams. The concrete strength of the keyway area had little effect on the seismic performance of the precast prestressed concrete joints. The precast prestressed concrete joints had a seismic performance that was comparable to the equivalent monolithic system.
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2

RUBIN, O. D., S. E. LISICHKIN, and O. V. ZYUZINA. "THE INFLUENCE OF BASALT-COMPOSITE PRESTRESSED REINFORCEMENT ON THE OPERATION OF LOW-REINFORCED CONCRETE STRUCTURES WITH INTERBLOCK CONSTRUCTION JOINTS." Prirodoobustrojstvo, no. 5 (2020): 50–59. http://dx.doi.org/10.26897/1997-6011-2020-5-50-59.

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It is proposed to use prestressed basalt composite reinforcement to strengthen reinforced concrete structures of hydraulic structures. In order to substantiate technical reinforcement of reinforced concrete structures of hydraulic structures with prestressed basalt composite inforcement, experimental studies were carried out. For experimental studies, reinforced concrete beam-type structures with vertical interblock construction joints were adopted.The results of experimental studies of reinforced concrete models of beam type with interblock joints reinforced with prestressed basalt composite reinforcement by the method of tension “on concrete”are presented. The models are tested for bending moment and transverse force. A special character of cracking is noted; full restoration of the bearing capacity of reinforced concrete structures, weakened by interblock construction joints, was recorded due to the reinforcement of prestressed basalt composite reinforcement.
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3

Li, Qing Ning, Huang Huang, and Wei Shan Jiang. "Joint Construction of Assembled Integrally Floor." Advanced Materials Research 446-449 (January 2012): 775–79. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.775.

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This article expounds the floor ends and sides joint constructions of prestressed concrete floor and prestressed concrete hollow floor with added surface，as well as prestressed concrete hollow floor without added surface，and the comparation are available。Finally，some new construction methods are raised based on improving the seismic performance of integrally assembled prestressed concrete floor。
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4

Rubin, Oleg D., Sergey E. Lisichkin, and Oksana V. Zyuzina. "Experimental studies of the stress-strain state of reinforced concrete structures strengthened by prestressed basalt-composite rebar." Structural Mechanics of Engineering Constructions and Buildings 17, no. 3 (October 24, 2021): 288–98. http://dx.doi.org/10.22363/1815-5235-2021-17-3-288-298.

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Анотація:
Relevance. In recent years, composite materials have become widespread in the construction of reinforced concrete structures for industrial, civil and transport structures. It is proposed to strengthen the reinforced concrete structures of hydraulic structures with prestressed basalt composite rebar. It took an experimental and theoretical substantiation of technical solutions to strengthen the reinforced concrete structures of hydraulic structures with prestressed basalt composite reinforcement. The aim of the work was to carry out a set of experimental and theoretical studies of the stress-strain state and internal forces in low-reinforced concrete structures of hydraulic structures reinforced with prestressed basalt composite rebar. Methods. Experimental studies of the stress-strain state and internal forces were carried out on the basis of low-reinforced concrete beam-type models with interblock construction joints, harden with prestressed basalt composite reinforcement in the stretched (compressed) zones of the models. Theoretical studies of the stress-strain state and internal forces were carried out on the basis of the theory of reinforced concrete and structural mechanics. Results. As a result of the research carried out on typical low-reinforced concrete structures of hydraulic structures with interblock construction joints, the main stages of the stress-strain state of hydraulic reinforced concrete structures were formulated. Based on the data of experimental and theoretical studies, taking into account the reinforcement with prestressed basalt composite rebar, as well as with prestressed clamps in the shear zone, a method was developed for calculating the strength of low-reinforced hydrotechnical reinforced concrete structures with interblock construction joints.
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5

Zyuzina, Oksana V. "Experimental studies of reinforced concrete structures of hydraulic structures strengthened with prestressed transverse reinforcement." Structural Mechanics of Engineering Constructions and Buildings 16, no. 6 (December 15, 2020): 504–12. http://dx.doi.org/10.22363/1815-5235-2020-16-6-504-512.

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Анотація:
Relevance. When repairing hydraulic structures, it is often necessary to face the task of strengthening them. Among the methods of strengthening retaining structures, the most interesting are those that allow to immediately include reinforcement elements in joint work with the structure and carry out work without removing the backfill soil from the rear edge. When choosing repair materials, attention should be paid to corrosion-resistant composite materials, the use of which in hydraulic engineering is not yet standardized, but the scope of their application is expanding every year. The main aim of experimental research is to strengthen the reinforced concrete structures of hydraulic structures, including those with interblock construction joints and transverse cracks, using prestressed transverse reinforcement. Methods. The investigations were carried out on a reinforced concrete model of a beam type reinforced with prestressed transverse reinforcement in the zone of inclined cracks formation. The model was made taking into account the typical tasks encountered during the repair of long-term operating retaining hydraulic structures with open seams and cracks, insufficient transverse reinforcement, low reinforcement coefficient, and initial deflection. Results. The task of strengthening a special reinforced concrete model using prestressed transverse reinforcement was realized. Experimental data were obtained on the nature of deformation and destruction, the opening of interblock construction joints and cracks, and the stresses in the reinforcement. Recommendations are given for strengthening the operated low-reinforced concrete structures of hydraulic structures with interblock construction joints with prestressed reinforcement.
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6

Yang, Min. "Prestressed Concrete Building Coal Mine Stent Design." Applied Mechanics and Materials 651-653 (September 2014): 1224–26. http://dx.doi.org/10.4028/www.scientific.net/amm.651-653.1224.

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With the continuous development of China's coal technology, prestressed concrete stand in the coal mine construction jobs because of the building structure stiffness, mechanical characteristics, and other characteristics of joints less widely used. Firstly, the main concepts of prestressed concrete is analyzed, combined with the building of a coal mine stent design prestressed concrete examples of the main problems in the mine design process involved the stent to expand a detailed analysis and discussion, hoping to mine construction of large buildings play a guiding role in improving mine safety production conditions, to provide reliable protection for coal mine safety.
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7

Han, Wei Wei, Dong Sheng Zhang, Na Li, Xi Juan Xu, and De Sheng Jia. "Research on the Construction Technology of Cross-Prestressed Concrete Pavement." Advanced Materials Research 857 (December 2013): 283–87. http://dx.doi.org/10.4028/www.scientific.net/amr.857.283.

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Cross-prestressed concrete pavement, without setting expansion joints, can extend its service life, improve its bearing capacity and make the continuous construction possible. In recent years, it has been successfully applied to toll plazas, short subgrade of the highway and the overweight or overloaded road. Materials choosing, construction method of the cross-prestressed concrete pavement was presented in details and some relevant problems during the construction have been discussed in this paper.
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8

Tang, Mengxiong, Zao Ling, and Yuliang Qi. "Bending Strength of Connection Joints of Prestressed Reinforced Concrete Pipe Piles." Buildings 13, no. 1 (January 3, 2023): 119. http://dx.doi.org/10.3390/buildings13010119.

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Анотація:
The connection joint of prestressed concrete pipe piles is a typical steel–concrete structure, and its bending strength has evolved into a critical factor affecting the safety of supporting structures in underground engineering. Based on full-scale bending tests of five specimens of large-diameter prestressed reinforced concrete (PRC) pipe piles and connection joints, as well as the corresponding finite element numerical simulation, the bending bearing and deformation characteristics of connection joints of PRC pipe piles were analyzed, together with the effects of concrete strength, precompression stress, and connection mode of joints. The results showed that the crack resistance of the welded joint of PRC pipe piles was equivalent to that of the pipe pile shaft, but the ultimate bending moment of the joint was about 58–87% of that of the pile shaft. The bending failure mode of the pipe pile joint was mainly manifested in the end plate yielding into a drum shape, with the tension side of the pile hoop and the end plate clearly separated from the pipe pile, and crushed concrete at the upper edge of the pile hoop. The bending strength of the joint can be improved by increasing the bonding strength between the end plates of the joint or embedding Rachel reinforcement in concrete. In addition, synchronously increasing the strength grade and reinforcement ratio of concrete or strengthening the precompression stress of concrete are favorable measures.
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9

Song, Manrong, Jiaxuan He, Yuan Liu, Hang Zhang, Chenjun Ge, Yadong Jin, Bingkang Liu, Shenjiang Huang, and Yan Liu. "Seismic Behavior of Three-Story Prestressed Fabricated Concrete Frame under Dynamic and Low Reversed Cyclic Loading." Advances in Civil Engineering 2018 (September 10, 2018): 1–10. http://dx.doi.org/10.1155/2018/7876908.

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Анотація:
Precast concrete structure is the building industrialization of the sure route. It can realize the construction process of low energy consumption and low emission and effectively meet the green development requirements of the construction industry. Based on prestressing technique, the connections of the precast concrete structure obtain prestress producing integrate joints and continuous frames, which improve the seismic safety and are applied widely in the earthquake area. To study seismic behavior of prestressed fabricated concrete frame structure, the experiments on the concrete frame under dynamic loading and low reversed cyclic loading were carried out. The single-span three-story prestressed fabricated concrete frame can accurately represent the load-carrying capability and the failure mechanism of multistory frame. Results of the study show that experimental specimens have good behaviors such as full hysteresis curves, proper displacement restoring capacity, and energy dissipation; the maximum interlayer drift ratio arrives 0.27% which has no damage to the frame in small earthquakes subjected to the 102 gal peak ground acceleration; the frame is repairable in moderate earthquakes when the maximal interlayer drift ratio arrives 0.73% subjected to the 204 gal peak ground acceleration; plastic hinges appeared at the ends of beam under low reversed cyclic loading firstly where the section curvature ductility factor ranges from 3.64 to 5.62; biaxial compression is acquired at beam-column joints with the help of column axial force and horizontal prestressing force; the beam fails before the column in the prestressed fabricated concrete frame at interlayer drift ratio between 1.56% and 2.56%.
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10

Li, Hong Jiang. "Influence of Stiffness Weakening at Construction Joints on the Deflection of Cantilevering-Cast Prestressed Concrete Box Girder." Applied Mechanics and Materials 777 (July 2015): 34–37. http://dx.doi.org/10.4028/www.scientific.net/amm.777.34.

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Анотація:
For a long-span prestressed concrete box-girder bridge erected by the double-cantilever segmental method, concrete of segmental joints and concrete in their nearby area may be different from integrally-cast concrete in structural performances. For example, the stiffness of segmental joints could be weakened significantly. To reveal influences of weakening in the stiffness of segmental joints on the deflection at mid-span of box girder, a typical continuous rigid frame bridge in China was taken as the analysis example, and its finite element models were established. In these models, weakening joints were simulated. After the validity of finite element models were warranted, the deflection in the completed construction stage and the long-term deflection in the running period of box girder were calculated, and then the variation of these deflections with the stiffness reduction in all segmental joints was described. Results showed that, compared with the shearing stiffness reduction in segmental joints, the bending stiffness reduction played more significant role in affecting the deflection of box girder. When the weakening times of joint stiffness arrived at 100, deflection values of the box girder increased significantly. However, in the practical engineering, the determination of stiffness reduction in segmental joints according by their damages, and the incorporation of weakening segmental joints into the bearing capacity assessment for existing box girders were all worth further study.
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Дисертації з теми "Prestressed concrete construction Joints"

1

Chlosta, Alexander. "Analysis of Prestressed Concrete Deck Bulb Tee Girder Bridges with Ultra-High Performance Concrete Longitudinal Joints." Ohio University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1574349161211748.

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2

Matthews, Debra Sue. "Blast effects on prestressed concrete bridges." Online access for everyone, 2008. http://www.dissertations.wsu.edu/Thesis/Summer2008/D_Matthews_072908.pdf.

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3

Semendary, Ali A. "Behavior of Adjacent Prestressed Concrete Box Beam Bridges Containing Ultra High Performance Concrete (UHPC) Longitudinal Joints." Ohio University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1518181442348314.

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4

Xu, Jiangong Barnes Robert W. "Nondestructive evaluation of prestressed concrete structures by means of acoustic emissions monitoring." Auburn, Ala, 2008. http://hdl.handle.net/10415/1429.

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5

Gross, Shawn Patrick. "Field performance of prestressed high performance concrete highway bridges in Texas /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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6

Yip, Hing-lun, and 葉慶倫. "Serviceability performance of prestressed concrete buildings taking into account long-term behavior." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B48330085.

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Анотація:
A common problem faced by engineers nowadays is the restriction on structural member dimensions due to architectural and spatial concerns. Such restrictions have resulted in the use of high-strength concrete in vertical members to reduce sizes, the use of central core walls and peripheral columns to increase window areas, the use of prestressed concrete floors to increase spans, etc. Serviceability problems such as cracking may, however, arise in the long term if these problems have not received proper attention during the design stage. This paper addresses several major issues associated with this type of buildings. Firstly, the differential axial shortening between the core walls and columns caused by large differences in stress levels will induce additional stresses and strains in the horizontal structural members, which are not normally accounted for in the traditional design methods. Secondly, the post-tensioning of concrete floors gives rise to additional internal forces induced in several ways such as time-dependent effects, sequential construction, and secondary “P-δ” effects of the high-strength slender columns. Thirdly, the soil-structure interaction could induce significant additional deformations and stresses in the buildings, although they are not always taken into account properly especially when carrying out simple or preliminary designs. These issues are vital and should be carefully considered in regular structural analyses and designs. With the common practice that most of the designs of prestressed concrete building structures are sublet to prestressing specialists, common structural engineers seldom have the insight into the structural performance of these buildings. Furthermore, utilities for calculating steel relaxation, which is an important factor governing the behaviour of prestressed concrete buildings, and its interactions with other time-dependent effects of concrete are hardly found in popular commercial software packages developed for building designs. All of these problems present obstacles in the correct modelling of prestressed concrete buildings. In the light of this, a practical but accurate method of modelling steel relaxation using the equivalent creep in commercial packages, that are normally good at dealing with complicated geometry, has firstly been developed in this work. The accuracy and reliability of the method are examined by comparing the results with available numerical solutions. Good agreement is observed. Secondly, a series of studies have been carried out based on a typical prestressed concrete building to examine various effects on the structural performance. It is found that the most influential effect is the time-dependent behaviour. It induces extra column moments, differential axial shortening, losses of tendon stresses, and P-delta moments. The construction sequence and soil-structure interactions are also found to affect the structural performance but they are less critical compared with the time-dependent effects. Finally, a parametric study has been carried out to evaluate the likely ranges of time-dependent effects on the structural behaviour.
published_or_final_version
Civil Engineering
Master
Master of Philosophy
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7

Maruri, Rodolfo Felipe. "Iterative computer analysis of post-tensioned concrete beams and frames." Thesis, Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/19510.

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8

黃崑 and Kun Huang. "Design and detailing of diagonally reinforced interior beam-column joints for moderate seismicity regions." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B31244233.

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9

Lemay, Lionel. "Repair of prestressed concrete bridge girders for shear." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=65943.

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10

Shapiro, Kelli Ann. "Finite-element modeling of a damaged prestressed concrete bridge." Auburn, Ala., 2007. http://repo.lib.auburn.edu/2007%20Spring%20Theses/SHAPIRO_KELLI_19.pdf.

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Книги з теми "Prestressed concrete construction Joints"

1

Mattock, Alan H. Strength of members with dapped ends. Chicago, Ill: Prestressed Concrete Institute, 1986.

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2

Clough, D. P. Design of connections for precast prestressed concrete buildings for the effects of earthquake. Chicago, Ill: PCI, 1986.

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3

1946-, Mitchell Denis, ed. Prestressed concrete structures. Englewood Cliffs, N.J: Prentice Hall, 1991.

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4

Prestressed concrete design. 2nd ed. London: E & FN Spon, 1998.

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5

Hurst, M. K. Prestressed concrete design. 2nd ed. London: E&FN Spon, 1998.

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6

A, Faulkes K., ed. Prestressed concrete. 2nd ed. Melbourne: Longman Cheshire, 1988.

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7

Prestressed concrete design. London: Chapman and Hall, 1988.

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8

Hurst, M. K. Prestressed concrete design. London: Chapman and Hall, 1988.

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9

Paul, Gauvreau, ed. Prestressed concrete bridges. Basel [Switzerland]: Birkhäuser Verlag, 1990.

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10

Prestressed concrete technology. Budapest: Akadémiai Kiadó, 1986.

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Частини книг з теми "Prestressed concrete construction Joints"

1

Libby, James R. "Bridge Construction." In Modern Prestressed Concrete, 620–41. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4615-3918-6_14.

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2

Libby, James R. "Construction Considerations." In Modern Prestressed Concrete, 696–733. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4615-3918-6_17.

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3

Menn, Christian. "Design and Construction of Special Bridge Types." In Prestressed Concrete Bridges, 293–438. Basel: Birkhäuser Basel, 1990. http://dx.doi.org/10.1007/978-3-0348-9131-8_7.

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4

Sur, Suchintya Kumar. "Joints in Concrete Structures." In A Practical Guide to Construction of Hydropower Facilities, 277–302. First edition. | New York, NY : CRC Press/Taylor & Francis Group, 2019.: CRC Press, 2019. http://dx.doi.org/10.1201/9781351233279-12.

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5

Pimenta do Vale, C., M. L. Sampaio, and R. F. Póvoas. "The introduction of prestressed concrete in Portugal: Teixeira Rêgo." In History of Construction Cultures, 554–61. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003173359-72.

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6

Menegotto, Marco, Giorgio Monti, and Marc’Antonio Liotta. "Prestressed FRP Fabrics for Flexural Strengthening of Concrete." In Innovative Materials and Techniques in Concrete Construction, 267–82. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1997-2_17.

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7

Bedirhanoglu, Idris, Alper Ilki, and Nahit Kumbasar. "Innovative Techniques for Seismic Retrofitting of RC Joints." In Innovative Materials and Techniques in Concrete Construction, 243–51. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1997-2_15.

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8

Bertero, Vitelmo V. "Partially Prestressed Concrete Members for Earthquake-Resistant Design and Construction." In Partial Prestressing, From Theory to Practice, 151–88. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4438-1_7.

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9

Wang, Ziyi, and Huifeng Su. "Study on construction control of expressway prestressed concrete continuous beam bridge." In Advances in Frontier Research on Engineering Structures Volume 1, 465–69. London: CRC Press, 2023. http://dx.doi.org/10.1201/9781003336631-73.

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10

Zayan, Hend S., and Akram S. Mahmoud. "Estimations the Combined Flexural-Torsional Strength for Prestressed Concrete Beams Using Artificial Neural Networks." In Geotechnical Engineering and Sustainable Construction, 583–96. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-6277-5_47.

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Тези доповідей конференцій з теми "Prestressed concrete construction Joints"

1

Song, Shoutan. "Analysis of the Shear Strength of Joints in Segmental Prestressed Concrete Bridges." In IABSE Congress, Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2016. http://dx.doi.org/10.2749/stockholm.2016.2066.

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2

Huber, Tobias, Stephan Fasching, and Johann Kollegger. "Shear connection between precast concrete bridge segments built with thin-walled elements." In IABSE Congress, Christchurch 2021: Resilient technologies for sustainable infrastructure. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2021. http://dx.doi.org/10.2749/christchurch.2021.0054.

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<p>Segmental bridge construction combines the advantages of prefabrication, for example the reduction of construction time and very high product quality, with those of common bridge erecting methods. Short precast segments are assembled and prestressed to form the complete superstructure. New methods divide these segments into prefabricated elements to create new lighter versions of the segments. For this to work, new joint types must be developed which can ensure the force transfer between the segments. In this paper, several methods, including a new concept for joining thin-walled pre-fabricated elements, are described. Push-off tests with a constant lateral force were carried out to assess the shear strength and deformation behaviour. The main parameters were the joint type (wet joints: plain, grooved, keyed; dry joints), the mortar type, and the level of lateral force. In this paper, the test results are presented and recalculations with a design code are shown.</p>
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3

Kim, Hyeong-Yeol, Sang-Yoon Lee, and Jae-Joon Song. "A Study On A Grout Joint For Precast Prestressed Concrete Slab Bridges." In The Seventh International Structural Engineering and Construction Conference. Singapore: Research Publishing Services, 2013. http://dx.doi.org/10.3850/978-981-07-5354-2_st-38-95.

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4

Needham, Mike, and James Collins. "The New Storstrøm Bridge – Pier Design." In IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2022. http://dx.doi.org/10.2749/prague.2022.0104.

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<p>The New Storstrøm Bridge in Denmark has 40 concrete piers ranging from 18 to 35m high. The piers comprise multi-faceted stems and pier heads. To simplify offshore construction a precast segmental solution was used, with a prestressed insitu pier head. The design was optimised through parametric analysis including non-linear modelling and automated calculation reporting. A modular approach maximised repetition of segments between different pier heights to enable precast construction in a factory environment prior to assembly offshore. Non-linear dynamic modelling was used to validate resistance to ship impact. Detailed analysis of the insitu joints between segments was undertaken, using headed bars to provide the required anchorages. The pier head was designed using finite element models to confirm the strut and tie behaviour and a prestress layout that minimised external pockets.</p>
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Lepourry, Clemence, Hugues Somja, Pisey Keo, Piseth Heng, and Franck Palas. "An innovative concrete-steel structural system allowing for a fast and simple erection." In 12th international conference on ‘Advances in Steel-Concrete Composite Structures’ - ASCCS 2018. Valencia: Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/asccs2018.2018.7014.

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In usual concrete buildings, medium to long span slabs can only be achieved by using prestressed beams. However, these elements are heavy, making their handling expensive; the cladding of these beams to vertical elements creates several difficulties, particularly in case of moment resisting frames; at last, their precamber implies a cautious management of the concreting and is a source of defects. Steel-concrete composite beams may offer an alternative, with similar performances. However they are not considered by concrete builders, because specific tools and skills are needed to erect them on site. Moreover usual composite members require a supplementary fire protection, which is costly and unsightly. This article presents an innovative steel-concrete moment resisting portal frame that overcomes these difficulties. It is based on composite tubular columns, and a composite beam made of a U-shaped steel profile used as permanent formwork to encase a concrete beam. This steel-concrete duality of beams allows an erection on site without any weld or bolt by a wise positioning of the construction joints. Moreover, as the resistance to fire is ensured by the concrete beam, the system does not require any additional fire protection. Finally, as only steel elements have to be handled on site, there is no need of heavy cranes. This system has been used to build a research center near Rennes, in France. As it is not covered in present norms, an experimental validation was required. After a detailed description of the structural system, the full-scale tests which have been performed are presented : - A series of asymmetrical push-out tests in order to determine the behaviour and resistance of shear connectors; - One 6-point bending test made to investigate the resistance of the USCHB under sagging bending moment; Two tests of the beam-column joint.
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Novák, Balthasar, Vazul Boros, and Jochen Reinhard. "Strengthening strategies of highway viaducts in Germany." In IABSE Congress, Christchurch 2021: Resilient technologies for sustainable infrastructure. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2021. http://dx.doi.org/10.2749/christchurch.2021.0245.

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<p>An entire generation of reinforced concrete highway bridges built in the post-war period in Germany meanwhile is approaching the end of their service life. The federal government and regional highway administrations have realized the need to repair, strengthen or to replace these structures and engage in extensive infrastructural investments to meet this challenge. It is not possible to replace those bridges in a short period, so that a guideline for reassessment of bridges has been developed to enable to prioritize the structures. Besides the replacement of the bridges, measures need to be taken in order to extend the lifespan of the decaying bridges until such replacement becomes available. Using the examples of four major highway viaducts near Frankfurt/Main and Hamburg efficient strategies to strengthen existing structures will be presented.</p><p>In the first example the efficient usage of external tendons to reduce the danger of a fatigue induced failure of a 50 years old prestressed concrete bridge will be presented.</p><p>A bridge of five spans with a total length of approximately 300 m showing inadequate shear resistance has been enhanced by installing inclined steel struts at the pillars. The struts are activated with a predefined force by built-in hydraulic jacks, while special spring elements used as supports reduce the effect of imposed deformations. Furthermore in critical areas of the webs additional shear reinforcement is mounted and subsequently covered by a concrete layer.</p><p>Another large viaduct was showing signs of fatigue at the coupling joints. A detailed analysis of the structure revealed, that the lifespan could be sufficiently prolonged by supporting the critical coupling joints with a predetermined force. The magnitude of the force is maintained constant by a balanced beam resembling a seesaw, which is mounted on a steel tower and fitted at its opposite end with counterweights.</p><p>The final example shows how to apply controlled uplift forces using an elastic bedded supporting beam construction.</p><p>These realized examples demonstrate, how with smart and intelligent measures critical bridges can be strengthened and an essential increase in lifespan can be achieved.</p>
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7

Chang, Luh-Maan, and Yu-Tzu Chen. "Precast Prestressed Concrete Pavement Construction." In Ninth Asia Pacific Transportation Development Conference. Reston, VA: American Society of Civil Engineers, 2012. http://dx.doi.org/10.1061/9780784412299.0074.

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8

Singh, Pramod Kumar, Vikash Khatri, and Tyagi R. K. "Prestressed Steel – Concrete Composite Bridge." In Research, Development and Practice in Structural Engineering and Construction. Singapore: Research Publishing Services, 2012. http://dx.doi.org/10.3850/978-981-08-7920-4_st-90-0286.

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9

Romer, Andrew E., Graham E. C. Bell, and R. Dan Ellison. "Failure of Prestressed Concrete Cylinder Pipe." In International Conference on Pipeline Engineering and Construction. Reston, VA: American Society of Civil Engineers, 2007. http://dx.doi.org/10.1061/40934(252)64.

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10

Jing, Yuan, Z. John Ma, Richard M. Bennett, and David B. Clarke. "Lateral Impact of Railroad Bridges With Hybrid Composite Beams: Finite Element Modeling and Preliminary Dynamic Behavior Study of HCB." In 2014 Joint Rail Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/jrc2014-3739.

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Grade separations have been used along High-Speed Rail (HSR) to decrease traffic congestion and the danger that occurs at grade crossings. However, the concern with grade separations is the potential damage due to lateral impact of bridge superstructures by over-height vehicles. This is a concern with existing bridges, and lateral impact is not included in standard bridge code provisions. A new bridge technology, Hybrid Composite Beam (HCB), was proposed to meet the requirements of another HSR objective, that of a sustainable solution for the construction of new and replacement bridges in rail infrastructure. The hybrid composite beam combines advanced composite materials with conventional concrete and steel to create a bridge that is stronger and more resistance to corrosion than conventional materials. The HCB is composed of three main parts; the first is a FRP (fiber reinforced polymer) shell, which encapsulates the other two parts. The second part is the compression reinforcement which consists of concrete or cement grout that is pumped into a continuous conduit fabricated into the FRP shell. The third part of the HCB is the tension reinforcement that could consist of carbon or glass fibers, prestressed strands, or other materials that are strong in tension, which is used to equilibrate the internal forces in the compression reinforcement. The combination of conventional materials with FRP exploits the inherent benefits of each material and optimizes the overall performance of the structure. The behavior of this novel system has been studied during the last few years and some vertical static tests have been performed, but no dynamic or lateral impact tests have been conducted yet. Therefore, the main objective of this study is to evaluate the performance of HCB when subjected to lateral impact loading caused by over-height vehicles. This paper explains the advantages of HCB when used in bridge infrastructures. The commercial software ABAQUS was used to perform the finite element (FE) modeling of a 30ft long HCB. Test data was used to validate the results generated by FE analysis. A constant impact loading with a time duration of 0.1 second was applied to an area at the mid-span of the HCB. Lateral deflection and stress distribution were obtained from FE analysis, and local stress concentration can be observed from the stress contour. Full-scale beam dynamic testing will be conducted in the future research to better study the behavior of HCB when subjected to over-height vehicles.
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Звіти організацій з теми "Prestressed concrete construction Joints"

1

Brewer, K. N. Effects of rebar and concrete construction joints on the migration of 4 M HNO{sub 3} in concrete test cylinders. Office of Scientific and Technical Information (OSTI), June 1993. http://dx.doi.org/10.2172/10102789.

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2

Nema, Arpit, and Jose Restrep. Low Seismic Damage Columns for Accelerated Bridge Construction. Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA, December 2020. http://dx.doi.org/10.55461/zisp3722.

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This report describes the design, construction, and shaking table response and computation simulation of a Low Seismic-Damage Bridge Bent built using Accelerated Bridge Construction methods. The proposed bent combines precast post-tensioned columns with precast foundation and bent cap to simplify off- and on-site construction burdens and minimize earthquake-induced damage and associated repair costs. Each column consists of reinforced concrete cast inside a cylindrical steel shell, which acts as the formwork, and the confining and shear reinforcement. The column steel shell is engineered to facilitate the formation of a rocking interface for concentrating the deformation demands in the columns, thereby reducing earthquake-induced damage. The precast foundation and bent cap have corrugated-metal-duct lined sockets, where the columns will be placed and grouted on-site to form the column–beam joints. Large inelastic deformation demands in the structure are concentrated at the column–beam interfaces, which are designed to accommodate these demands with minimal structural damage. Longitudinal post-tensioned high-strength steel threaded bars, designed to respond elastically, ensure re-centering behavior. Internal mild steel reinforcing bars, debonded from the concrete at the interfaces, provide energy dissipation and impact mitigation.
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3

DeSantis, John, and Jeffery Roesler. Longitudinal Cracking Investigation on I-72 Experimental Unbonded Concrete Overlay. Illinois Center for Transportation, February 2022. http://dx.doi.org/10.36501/0197-9191/22-002.

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A research study investigated longitudinal cracking developing along an experimental unbonded concrete overlay (UBOL) on I-72 near Riverton, Illinois. The project evaluated existing literature on UBOL (design, construction, and performance), UBOL case studies, and mechanistic-empirical design procedures for defining the mechanisms that are contributing to the observed distresses. Detailed distress surveys and coring were conducted to assess the extent of the longitudinal cracking and faulting along the longitudinal lane-shoulder joint. Coring over the transverse contraction joints in the driving lane showed stripping and erosion of the dense-graded hot-mix asphalt (HMA) interlayer was the primary mechanism initiating the longitudinal cracks. Cores from the lane-shoulder joint confirmed stripping and erosion was also occurring there and leading to the elevation difference between the driving lane and shoulder. Field sections by surrounding state departments of transportation (DOTs), such as Iowa, Michigan, Minnesota, Missouri, and Pennsylvania, with similar UBOL design features to the I-72 section were examined. Site visits were performed in Illinois, Michigan, Minnesota, and Pennsylvania, while other sections were reviewed via state DOT contacts as well as Google Earth and Maps. Evidence from other DOTs suggested that HMA interlayers, whether dense graded or drainable, could experience stripping, erosion, and instability under certain conditions. An existing performance test for interlayers, i.e., Hamburg wheel-tracking device, and current models reviewed were not able to predict the distresses on I-72 eastbound. Adapting a dynamic cylinder test is a next step to screen HMA interlayers (or other stabilized layers) for stripping and erosion potential. To slow down the cracking and faulting on I-72 eastbound, sealing of the longitudinal lane-shoulder joint and driving lane transverse joints is suggested. To maximize UBOL service life, an HMA overlay will minimize water infiltration into the interlayer system and significantly slow down the HMA stripping and erosion mechanism that has led to longitudinal cracking and lane-shoulder faulting.
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4

State-of-the-Art Report on Precast Concrete Pavements. Precast/Prestressed Concrete Institute, 2012. http://dx.doi.org/10.15554/pp-05-12.

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This publication is a combination of four documents on the use of precast concrete pavement systems (PCPS) and constitutes a state of the art report on this topic. The documents were developed through a cooperative agreement between the Precast/Prestressed Concrete Institute, PCI and the Federal Highway Administration (FHWA). The topics include: Applications for Precast Concrete Pavements, Design and Maintenance of Precast Concrete Pavements, Manufacture of Precast Concrete Pavement Panels and Construction of Precast Concrete Pavement.
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5

PCI Standard Design Practice Ref ACI-318-05. Precast/Prestressed Concrete institute, 2020. http://dx.doi.org/10.15554/sdp-318-05.

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PCI Standard Design Practice Ref ACI-318-05 Precast and prestressed concrete structures have provided decades of satisfactory performance. This performance is the result of the practices reported herein, conformance with ACI 318-05, Building Code Requirements for Structural Concrete,1 incorporation of industry-specific research programs, and a plant certification program that provides an industry-wide quality control system beyond those found in onsite construction.
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6

PCI Standard Design Practice Ref ACI-318-08. Precast/Prestressed Concrete institute, 2020. http://dx.doi.org/10.15554/sdp-318-08.

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PCI Standard Design Practice Ref ACI-318-08 Precast and prestressed concrete structures have provided decades of satisfactory performance. This performance is the result of the practices reported herein, conformance with ACI 318-08 Building Code Requirements for Structural Concrete and Commentary, incorporation of industry specific research programs and a plant certification program that provides an industrywide quality control system beyond that found in on-site construction. Section 1.4 of the ACI 318-08 specifically allows variances when the adequacy of which has been shown by successful use or by analysis or test. Suggested changes to code provisions resulting from experience, analysis or testing can provide a point for discussion with building officials for acceptance of revised provisions within the guidance and scope of Section 1.4 of ACI 318-08.
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7

PCI Standard Design Practice Ref ACI-318-11. Precast/Prestressed Concrete institute, 2020. http://dx.doi.org/10.15554/sdp-318-11.

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PCI Standard Design Practice Ref ACI-318-11 Precast and prestressed concrete structures have provided decades of satisfactory performance. This performance is the result of the practices reported herein, conformance with ACI 318-11 Building Code Requirements for Structural Concrete and Commentary, incorporation of industry specific research programs and a plant certification program that provides an industrywide quality control system beyond that found in on-site construction. Section 1.4 of the ACI 318-11 specifically allows variances when the adequacy of which has been shown by successful use or by analysis or test. Suggested changes to code provisions resulting from experience, analysis or testing can provide a point for discussion with building officials for acceptance of revised provisions within the guidance and scope of Section 1.4 of ACI 318-11. This list of provisions is based on ACI 318-11, and the numbers refer to sections in that document and are presented in numerical order. For notation used within this document refer to the notation used in Chapter 2 of ACI 318-11. Excerpts from ACI 318-11 are reprinted here with permission by the American Concrete Institute, Farmington Hills, Michigan.
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