内藏不同高宽比分块钢板双肢剪力墙抗震性能试验研究

Experimental study on seismic behavior of coupled shear walls with concealed partitioned steel plates

内藏分块钢板双肢剪力墙是由钢管混凝土边框、型钢混凝土叠合暗柱、墙肢内藏分块钢板、连梁内藏钢板、混凝土墙体、混凝土连梁等构件组成。对4个1∶5缩尺,剪跨比为1.68,轴压比为0.3的组合双肢剪力墙试件进行了低周反复荷载试验。研究不同内藏钢板布置形式、不同钢板用钢量对试件抗震性能的影响,考察了内藏分块钢板双肢剪力墙的破坏形态、滞回特性、刚度、变形及耗能能力,分析了剪力墙各部件在水平荷载作用下的合理屈服破坏顺序。试验结果表明:4个试件均发生弯剪型破坏,内藏分块钢板双肢剪力墙相比于钢管混凝土边框双肢剪力墙整体抗侧刚度大,具有较强的耗能能力、变形能力及延性,对抗震有利;分块钢板参数选择对双肢剪力墙抗震性能影响明显。

A coupled shear wall with concealed partitioned steel plate contains concrete filled steel tube （CFST） frame, steel reinforced concrete （SRC） columns, concealed partitioned steel plates within walls, concealed steel plates within beams, reinforced concrete （RC） walls and RC coupling beams. Four 1 ： 5 scaled coupled shear wall specimens were experimentally studied to investigate the behavior under simulated seismic action. The aspect ratios and compression ratios of the four specimens were 1.68 and 0.4 respectively. The test focused on effect of arrange- ment scheme of concealed partitioned steel plates and steel ratios on the seismic behavior of specimens. The failure patterns, hysteretic characteristics, stiffness, deformation capacity and energy dissipation capacity were studied. The yielding sequence of various elements in the coupled shear walls was discussed. Test results indicate that all four specimens fail in flexure-shear dominant patterns. Comparing coupled shear wall with CFST frame, energy dis- sipation, deformation and ductility of coupled shear walls with concealed partitioned steel plates is higher. The seis- mic behavior of coupled shear wall is influenced significantly by concealed partitioned steel plates.