混合联肢部分外包组合剪力墙抗震性能试验研究

Experimental study on seismic performance of hybrid coupled partially encased composite shear wall

为满足高层建筑对抗震性能及装配性能的要求,提出一种混合联肢部分外包组合剪力墙结构。通过对一榀三层对称双肢2/3缩尺试件的低周反复加载试验,观测混合联肢部分外包组合剪力墙结构在循环荷载作用下的破坏全过程,分析试件的滞回性能、承载力、延性、刚度退化、耗能能力及连梁转动能力。研究表明:混合联肢部分外包组合剪力墙结构的滞回曲线饱满而稳定,没有明显的捏缩现象,该试件正反向位移延性系数平均值达到3.65,抗震性能及协同工作能力良好;剪切型钢连梁的损伤集中在连梁腹板处,极限塑性转角达到0.05rad;由于墙肢中部区格翼缘的设置,限制墙肢底部混凝土剪切裂缝的发展,剪力墙破坏的主要形式为弯曲破坏;钢连梁及型钢部分外包组合剪力墙均表现出优良延性和耗能能力;结构极限层间侧移角达到1/45,超过罕遇地震下规范限值要求。按照整体结构屈服时耦连比为45%设计的试件,塑性铰的发展满足"强墙肢弱连梁"的规律。基于试验结果,利用有限元软件ABAQUS进行拟静力分析,与试验吻合较好。

In order to meet the requirements of seismic performance and assembly performance of high-rise buildings, a hybrid coupled partially encased composite shear wall is proposed.Low cyclic loading test was conducted on a 3-story symmetrical double-leg with a scale of 2/3, by which the whole process of the hybrid coupled partially encased composite shear wall under cyclic loading was observed, and the hysteretic performance, bearing capacity, ductility, stiffness degradation, energy dissipation capacity and rotation capacity of coupling beam were analyzed.The results showed that the hysteretic curve of the hybrid coupled partially encased composite shear wall was full and stable, and there was no obvious pinch phenomenon.The average ductility coefficient of the forward and backward displacement was 3.65, which showed good seismic performance and cooperative working ability.The damage of shear steel coupling beam mainly concentrated in the web of coupling beam, and its ultimate plastic angle can reach 0.05 rad.The grid flange in the middle of wall limb could limit the development of shear crack at the bottom of wall limb.The main failure mode of shear wall was bending failure.The steel coupling beam and shear wall exhibited good ductility and energy dissipation capacity.The ultimate displacement angle between stories was 1/45, which exceeded the code limit under rare earthquakes.The steel coupling beam and the PEC shear wall both showed excellent ductility and energy dissipation capacity.According to the specimen designed with the coupling ratio of 45% when the whole structure yields, the development of plastic hinge conforms to the law of "strong-wall-limb and weak-coupling-beam".The quasi-static analysis results by using the finite element software ABAQUS agree well with the test ones.