高强钢筋高强混凝土双连梁剪力墙抗震性能试验研究
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摘要
高强钢筋、高强混凝土剪力墙结构中使用双连梁可以有效改善结构受力性能,解决设计中经常遇到的诸如连梁超筋、截面受剪承载力不足等问题。基于此,设计并制作了2个3层1/4缩尺的高强钢筋高强混凝土双肢剪力墙试件,其中一个试件的连梁采用单连梁形式,另一个试件的连梁采用双连梁形式。在相同的试验条件下,对比研究二者在低周反复荷载作用下的承载力、滞回特性、延性、耗能能力,分析双连梁结构形式在高强钢筋高强混凝土双肢剪力墙中的性能及作用。试验结果表明:具有相同配筋率的分缝双连梁双肢剪力墙结构与小跨高比单连梁双肢剪力墙结构相比,承载力降低了20%~30%,延性增加了约30%,耗能能力增加了约20%,在弹性阶段刚度降低约30%。从最终的破坏形态来看,单连梁剪力墙试件连梁出现了明显的剪切斜裂缝,箍筋全部屈服,最终发生剪切破坏;双连梁剪力墙试件只在连梁端部出现了弯曲裂缝未出现斜裂缝,箍筋自始至终未屈服,最终发生弯曲破坏。双连梁剪力墙结构能有效降低连梁内力,提高其延性。
The use of high strength steel and high strength concrete in double beam structure is intended to enhance the mechanical performance of double beam,which can solve the problems existing in the design. In this research two three-layer 1 /4 scaled high strength reinforced concrete shear wall model were designed and manufactured. One model used single coupling beam and the other used double coupling beam. Comparative study on load carrying capacity,hysteretic behavior,ductility,energy dissipation capacity of the two models under low cycle reversed loading were carried out,and the role of double coupling beam in high strength reinforced concrete wall was explored. The results show that compared with the single coupling beam structure,the strength of the double coupling beam structure is reduced by 20% to 30%,the ductility is increased by about 30%,the energy dissipation capacity is increased by about 20%,and the stiffness in the elastic stage is reduced by about 30%. From the final failure pattern,the emergence of shear cracks on the single coupling beam is very obvious and all stirrups yield,resulting in shear failure.The double coupling beam has never developed any shear cracks and stirrups never yield,resulting inbending failure.From this point of view,the double coupling beam can effectively reduce the beam internal force and improve the ductility of the structure.
The use of high strength steel and high strength concrete in double beam structure is intended to enhance the mechanical performance of double beam,which can solve the problems existing in the design. In this research two three-layer 1 /4 scaled high strength reinforced concrete shear wall model were designed and manufactured. One model used single coupling beam and the other used double coupling beam. Comparative study on load carrying capacity,hysteretic behavior,ductility,energy dissipation capacity of the two models under low cycle reversed loading were carried out,and the role of double coupling beam in high strength reinforced concrete wall was explored. The results show that compared with the single coupling beam structure,the strength of the double coupling beam structure is reduced by 20% to 30%,the ductility is increased by about 30%,the energy dissipation capacity is increased by about 20%,and the stiffness in the elastic stage is reduced by about 30%. From the final failure pattern,the emergence of shear cracks on the single coupling beam is very obvious and all stirrups yield,resulting in shear failure.The double coupling beam has never developed any shear cracks and stirrups never yield,resulting inbending failure.From this point of view,the double coupling beam can effectively reduce the beam internal force and improve the ductility of the structure.
引文
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[9]GB 50010—2010混凝土结构设计规范[S].北京:中国建筑工业出版社,2010.(GB 50010—2010Code for design of concrete structures[S].Beijing:China Architecture&Building Press,2010.(in Chinese))
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[11]GB 50011—2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.(GB 50011—2010 Code for seismic design of buildings[S].Beijing:China Architecture&Building Press,2010.(in Chinese))
[2]梁兴文,邓明科,张兴虎,等.高性能混凝土剪力墙性能设计理论的试验研究[J].建筑结构学报,2007,28(5):80-88.(LIANG Xingwen,DENG Mingke,ZHANG Xinghu,et al.Experimental study on performance-based seismic design of high performance concrete shear wall[J].Journal of Building Structures,2007,28(5):80-88.(in Chinese))
[3]梁兴文,辛力,邓明科,等.高强混凝土剪力墙抗震性能及其性能指标试验研究[J].土木工程学报,2010,43(11):37-45.(LIANG Xingwen,XIN Li,DENG Mingke,et al.Experimental study on seismic performance of high-strength concrete shear wall[J].China Civil Engineering Journal,2010,43(11):37-45.(in Chinese))
[4]梁兴文,寇佳亮,邓明科.高强混凝土剪力墙性能指标研究[J].建筑结构,2012,42(4):90-93.(LIANG Xingwen,KOU Jialiang,DENG Mingke,et al.Research on the performance of high-strength concrete shear wall[J].Building Structure,2012,42(4):90-93.(in Chinese))
[5]储自莹,王慧英.连梁设计建议[J].建筑结构,1997(1):18-20.
[6]李杰.混凝土随机损伤力学的初步研究[J].同济大学学报(自然科学版),2004,32(10):1270-1273.(LI Jie.Research on the stochastic damage mechanics for concrete materials and structures[J].Journal of Tongji University(Natural Science),2004,32(10):1270-1273.(in Chinese))
[7]李奎明.高性能混凝土双连梁短肢剪力墙试验研究[J].地震工程与工程振动,2006,26(6):56-57.(LI Kuiming.Experimental study on HPC short-leg shear wall with a pair of beams[J].Earthquake Engineering and Engineering Dynamics,2006,26(6):56-57.(in Chinese))
[8]胥玉祥,朱玉华.双连梁受力性能研究[J].结构工程师,2010,26(3):31-37.(XU Yuxiang,ZHU Yuhua.Research on dual coupling beams based on mechanical performance[J].Structural Engineers,2010,26(3):31-37.(in Chinese))
[9]GB 50010—2010混凝土结构设计规范[S].北京:中国建筑工业出版社,2010.(GB 50010—2010Code for design of concrete structures[S].Beijing:China Architecture&Building Press,2010.(in Chinese))
[10]东南大学,同济大学,天津大学.混凝土结构与砌体结构设计[M].北京:中国建筑工业出版社,2005:248-252.(Southeast University,Tongji University,Tianjin University.Design of concrete structure and masonry structure[M].Beijing:China Architecture&Building Press,2005:248-252.(in Chinese))
[11]GB 50011—2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.(GB 50011—2010 Code for seismic design of buildings[S].Beijing:China Architecture&Building Press,2010.(in Chinese))
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