碟簧-螺栓组件连接全装配式混凝土剪力墙抗震性能研究

SEISMIC PERFORMANCE OF PRECAST CONCRETE SHEAR WALL WITH DISC SPRING-BOLT ASSEMBLY CONNECTIONS

  • 摘要: 本文通过在螺栓连接盒内设置组合碟簧,提出了一种碟簧-螺栓组件连接剪力墙结构。这一结构利用碟簧提供自复位能力,利用钢连接盒协助混凝土受压,具有良好的功能可恢复能力。设计并制作了一片采用传统“强连接”的盒式螺栓连接剪力墙试件(S-1)和一片新型剪力墙试件(S-2),对其进行了多个工况下的拟静力试验,对比分析了两种结构的抗震性能和损伤模式,并研究了新型剪力墙的功能可恢复能力以及轴压比、碟簧类型对新型剪力墙抗震性能的影响。试验结果表明:由于剪力墙受弯承载力存在一定程度超强,试件S-1内出现了连接盒锚筋顶端和水平拼缝附近两个塑性部位,两部位的纵筋和高强螺栓均达到屈服,混凝土也均严重压碎;试件S-2的损伤则集中在水平拼缝附近,墙体本身损伤轻微,试件残余变形小;试件S-2滞回曲线呈旗帜形,耗能能力与S-1相比较小;S-2加载至顶点位移角为1/100后重复试验,滞回环几乎重合,表明剪力墙罕遇地震后即使不加修复仍具有良好的抗震性能;采用C类碟簧的工况开裂后刚度和相同位移时的强度均低于采用A类碟簧工况。

     

    Abstract: Through introducing disc springs into one bolt box, a new type of shear wall structures with disc spring-bolt assembly connections was proposed in this study. This structure utilizes disc springs to provide self-centering capabilities and employs steel bolt boxes to assist with concrete compression, resulting in excellent resilience. A traditional bolted shear wall specimen with a "strong connection" (S-1) and a shear wall specimen with the new connection (S-2) were designed and fabricated. Quasi-static tests under various test conditions were conducted to the two specimens, and the seismic performance and damage patterns of the two specimens were compared and analyzed. Furthermore, the resilience of the new shear wall, as well as the impact of the axial compression ratio and disc spring type on the seismic performance of the structure was evaluated. The test results indicated that: due to the over strength of the wall panel, plastic zones appeared both near the top end of the anchorage bar of the bolt box and near the horizontal joint of specimen S-1. In these regions, the longitudinal reinforcement and high-strength bolts yielded, and the concrete was severely crushed. The damage of specimen S-2 was concentrated near the horizontal joint, while the wall panel suffered only minor damage and exhibited small residual deformation. The hysteresis curve of specimen S-2 presented a flag shape, exhibiting a smaller energy dissipation capacity compared to S-1. When specimen S-2 was subjected to repeated tests after reaching a drift ratio of 1/100, the hysteresis loops almost overlapped, indicating that the shear wall still possessed a good seismic performance even without a repair after a rare earthquake event. The post-cracking stiffness and strength at the same displacement of the test condition using Class C disc springs are lower than those using Class A disc springs.

     

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