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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 double-girder in high-strength steel bar and high-strength concrete shear wall structure can effectively improve the mechanical performance of the structure and solve the problems frequently encountered in design such as connecting beam and overbending, insufficient shear capacity of section. Based on this, two 3-ply, 1/4-scale high strength concrete high-strength concrete shear walls with double-wall shear walls were designed and fabricated. One of the specimens was connected by a single beam and the other was connected by Double beam form. Under the same experimental conditions, the bearing capacity, hysteretic behavior, ductility and energy dissipation capacity of the two beams under cyclic low-cycle loading were compared and analyzed. Performance and function. The experimental results show that compared with single-beam double-wall shear wall structure with single-beam with small span ratio, the load-bearing capacity of the split double-beam double-wall shear wall with the same reinforcement ratio is reduced by 20% -30% and the ductility is increased About 30%, energy consumption increased by about 20%, stiffness decreased by about 30% in the elastic phase. From the final form of failure, the shear-crack of the shear-wall specimens with single-beam shear walls shows obvious oblique shear cracks, and the stirrups all yield and eventually shear failure. The specimens with double- Bending cracks appeared in the end without diagonal cracks, and the stirrups did not give in until they reached the end. Finally, the bending failure occurred. The double-beam shear wall structure can effectively reduce the internal force of the connecting beam and improve its ductility.