角部构造改进装配式组合剪力墙力学性能试验研究
Experimental Study on Mechanical Performance of Prefabricated Composite Shear Wall with Improved Corner Construction
在地震荷载作用下,剪力墙结构角部混凝土常发生压碎脱落,进而导致构件承载力下降,确保角部混凝土不提前损伤失效是提升其抗震性能的有效途径之一。针对内藏钢板-外包混凝土板装配式组合剪力墙结构,提出了角部加厚处理、角部直边加肋处理、角部圆边加肋处理三种构造改进方式,文中设计制作了4组装配式组合剪力墙试件,并对其开展了低周往复加载试验研究,探讨了不同角部构造改进方式对组合剪力墙抗震性能的影响。结果表明:三种角部构造改进方式均能有效提升减轻装配式组合剪力墙的抗震性能,消除加载过程中角部混凝土提前损伤失效、墙身斜裂缝交织的问题;角部构造改进后,试件的承载力、抗侧刚度、滞回耗能等力学性能较角部构造未改进试件均有大幅提升,其中以角部圆边加肋构造的改进效果最优,该改进试件在加载位移角达到1/37时,峰值承载力、抗侧刚度较未改进试件分别提升了16.77%和26.67%。
Under seismic loads, the concrete at the corners of shear wall structures often experiences crushing and spalling, leading to a decrease in the bearing capacity. Ensuring that the concrete at the corners is not damaged or fails prematurely is one of the effective ways to improve the seismic performance of shear walls. Three construction improvement methods are proposed for the assembled composite shear wall structure with embedded steel plate and outer concrete plate, including corner thickening treatment, corner straight edge rib treatment, and corner circular edge rib treatment. Four kinds of assembly composite shear wall test specimens are designed. Low cycle reversed tests are conducted for the four specimens to explore the influence of different corner construction improvement methods on the seismic performance of composite shear walls. The results show that the three improved methods of corner construction can effectively improve the seismic performance of prefabricated composite shear walls. The improved methods can mitigate the early damage and failure of corner concrete and interweaving of diagonal cracks in the wall body during the loading process of specimens. The mechanical properties of the specimen, such as load-bearing capacity, lateral stiffness, and hysteresis energy dissipation, have been significantly improved compared to the specimens without improvement in the corners, and the optimal treatment is corner circular edge rib treatment. The peak bearing capacity and lateral stiffness were increased by 16.77% and 26.67% respectively when the loading displacement angle reached 1/37 compared to the unmodified specimen.
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