【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。更多还原

【Abstract】 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.更多还原