布置阻尼器的现浇与预制装配式框架梁柱组合体抗震性能试验研究

Experimental study on seismic performance of beam-column subassembly between cast-in-situ and precast frame structure with dampers

为研究安装有扇形铅黏弹性阻尼的现浇和预制混凝土框架梁柱组合体试件抗震性能的差异,对这两种梁柱组合体试件进行了低周反复加载试验,对比研究了两者的破坏模式、滞回耗能性能、承载能力、位移延性、承载力退化、节点核心区钢筋应变和受剪承载力。结果表明:扇形铅黏弹性阻尼器改变了预制试件的受力模式,使其梁端塑性铰外移,减缓和控制了节点核心区裂缝开展,保护了节点;减震试件的滞回曲线饱满,塑性变形能力强,刚度和承载力退化曲线也较为平缓,提高节点抗震能力;预制试件抗震性能与现浇试件基本相同,实现了阻尼器改善预制框架节点抗震性能目标。

Cyclic loading tests of three specimens were carried out to study seismic performance of beam-column subassembly in two kinds of frames( cast-in-situ concrete frame and precast concrete frame) with sector lead viscoelastic dampers( SLVD),and the seismic performances including failure mode,hysteresis energy-dissipating capacity,bearing capacity,displacement ductility,carrying capacity degradation,and strain of reinforcing-rebar in beam-column core region. The results indicate that SLVD can protect the beam-column joint through changing the stress pattern of precast concrete frame joint,which shifts away the plastic hinge from beam ends,and delays development of cracks in joint core area. The hysteretic curve of the joint in frame structure with SLVD is plump. It has strong plastic deformation capacity,and degradation curve of stiffness and carrying capacity is not reduced seriously. The seismic performance of the precast frame structure with SLVD is approximately the same as the cast-insitu frame structure with SLVD,so as to reach the objective of improving seismic performance of joint in precast concrete frame structure.