密肋框格防屈曲低屈服点钢板剪力墙抗震性能试验研究

摘要

Buckling-restrained multi-stiffened low yield point steel plate shear walls (BRMS-LYP-SPSWs),which uses LYP steel as infill plate and multiple stiffeners to restrain its overall buckling,is a new type of system to resist lateral force.Three specimens with 1/3 scale of single-span and two and a half stories semi-rigid frame with BRMS-LYP steel plate were tested under low-cycle reverse loading,in order to systematically study the seismic behavior of the new structural member.Comparative analyses on loading capacities,ductility,lateral resistant stiffness and energy dissipation capacities of the specimens were conducted,and then the influence of joint stiffness and connection form between frame and shear wall were evaluated,so that the failure modes of three specimens can be investigated.The test results indicate that the BRMS-LYP-SPSWs possesses stable bearing capacity,excellent plastic deformation behavior,high initial lateral stiffness and good energy dissipation capacity.All of the hysteretic curves appear to be spindle,which may be attributed to the utilization of BRMS and the role identical to two-side connection due to BRMS.As a result,the mechanical performance of the steel plate can be effectively enhanced and the pinch shrinkage of hysteretic loop can be obviated.The innovative structural system possesses the desirable yielding sequences and reasonable failure mode.The beamcolumn joint has slight effect on the seismic behavior of specimens,and decreasing the stiffness of connection may improve the structural ductility and energy dissipation.Eventually,the theoretical predictions of bearing capacity and initial stiffness of each specimen were compared with the experimental results,and good agreements could be observed.%密肋框格防屈曲低屈服点钢板剪力墙是一种新型抗侧力体系,采用力学性能优良的低屈服点钢作为内填墙板,通过密肋框格抑制钢板面外屈曲.为系统研究其抗震性能,进行了3榀1/3比例单跨两层半试件的低周往复荷载试验.对比分析各试件在循环荷载作用下的承载力、延性、刚度和耗能能力,探究不同节点刚度和框-墙连接方式的影响,考察三者的破坏形态.试验结果表明:密肋框格防屈曲钢板墙具有稳定的承载力和良好的塑性变形能力,结构初始侧向刚度大,耗能性能优良.防屈曲密肋框格的设置起到类似两边连接的作用,有效改善了内填板的受力特性,试件的滞回曲线饱满,避免出现“捏缩”现象.结构具有理想的屈服顺序和较为合理的破坏模式.梁柱节点对试件的抗震性能影响较小,降低连接刚度能够提高结构的延性和耗能.最后将各试件承载力和初始刚度的理论计算值与试验结果进行对比,二者较为吻合.