扇形铅粘弹性阻尼减震混凝土框架结构节点抗震性能试验对比研究

摘要

Aimed at studying the impact of sector lead viscoelastic damper(SLVD) on earthquake resistance performance of joints in concrete structure,both amortization concrete frame with SLVD and conventional concrete frame are tested by low-cycle reversed loading experiment.Additionally,both of the failure mechanism,performance of hysteretic energy dissipation,bearing capacity,displacement ductility,strength degradation and the changes about the strain of stressed rebar at beam end are studied comparatively.It reveals that because amortization concrete frame with SLVD is influeced by damper,its plastic hinge in beam end is relocated,which mitigates and controls cracks development of the core joints,as well as protecting the joints.The hysteretic curve of SLVD specimen,whose shape is tike "bow",is plumper than the conventional specimen's.Also,the joint plastic deformation ability is strong,which is enable to absorb great amout of energy of earthquake.Futhermore,SLVD obviously improves the cracking load,yield displacement ductility capacity,ultimate bearing capacity and overall hysteretic energy dissipation ability.The stiffness and stength degradation curve of SLVD is gentle.%为研究扇形铅粘弹性阻尼器对混凝土框架结构节点抗震性能的影响,对扇形铅粘弹性阻尼减震混凝土框架节点和混凝土普通框架节点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、强度退化和梁端受力筋应变等变化.结果表明:扇形铅粘弹性阻尼减震框架节点中由于阻尼器的影响,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.扇形铅粘弹性阻尼减震试件,其滞回曲线相对普通试件饱满,呈“弓形”,节点塑性变形能力强,能够吸收大量地震能量.扇形铅粘弹性阻尼器对框架节点的开裂荷载、屈服点位移延性能力、极限承载力及总体滞回耗能能力的提高较为明显,刚度和强度退化曲线也较为平缓.