高阻尼混凝土带钢板暗支撑双肢剪力墙抗震性能试验研究

STUDY ON SEISMIC PERFORMANCE OF HIGH DAMPING CONCRETE COUPLED SHEAR WALLS WITH CONCEALED STEEL PLATE BRACINGS

该文完成了2个四层1∶4缩尺高阻尼混凝土带钢板暗支撑双肢剪力墙低周反复加载试验,详细分析了该剪力墙结构的承载力、延性、耗能、破坏机制和破坏特征等,并与高阻尼混凝土带混合暗支撑双肢剪力墙进行了对比分析。利用有限元分析软件ABAQUS对试验模型进行了模拟,并分析了双肢剪力墙相对含钢率对高阻尼混凝土带钢板暗支撑双肢剪力墙承载力的影响。结果表明:与高阻尼混凝土带混合暗支撑相比,带钢板暗支撑的高阻尼混凝土双肢剪力极限承载力和耗能能力均有一定程度的提高,剪力墙连梁剪跨比越小,高阻尼混凝土剪力墙的抗震性能越好,当墙肢及连梁含钢率分别在2.5%和3%以下时,墙肢及连梁含钢率对双肢剪力墙的极限承载力有较大影响。

Quasi-static cyclic loading tests on two one-fourth scale models of four-story high damping concrete coupled shear walls（HDCSW） with concealed steel plate bracings are carried out, the bearing capacity, ductility, energy dissipation, and failure characteristics of the test models are analyzed systematically and are compared with those of HDCSW with mixed concealed bracings. Meanwhile, finite element analysis of HDCSW with concealed steel plate bracings under low-cycle load are conducted using the software ABAQUS. The results of numerical simulation and model experiments show that, compared with the HDCSW with mixed concealed bracings, the ultimate bearing capacity, the energy dissipation and the deformation capacity of the HDCSW with concealed steel plate bracings are improved; with decreasing span-depth ratio in the coupling beams, the HDCSW with concealed steel plate bracings show increasingly better seismic performance; when the steel ratios of wall limbs and coupling beams are less than 2.5% and 3%, respectively, the effect of the steel ratio on the ultimate bearing capacity of the HDCSW with concealed steel plate bracings is greater.