钢筋混凝土带暗支撑双肢剪力墙抗震性能试验研究

提出了一种新型钢筋混凝土延性双肢剪力墙,即带暗支撑双肢剪力墙,进行了3个四层双肢剪力墙1/4缩尺模型的抗震性能试验研究。较系统地分析了结构的刚度及其衰减过程,以及承载力、延性、耗能、破坏机制和破坏特征等。试验结果表明在连梁中加配交叉斜筋对提高承载力和延性效果显著,但对两道抗震防线的控制不太理想;两墙肢加设暗支撑后,两墙肢抗震能力明显增强,有明确的两道抗震防线,同时结构整体变形和耗能能力显著增强,带暗支撑双肢剪力墙的关键在于合理地控制了剪力墙的破坏机制。文中还建立了带暗支撑双肢剪力墙的力学模型、承载力计算公式,计算结果与实测值符合较好。

Experimental study on seismic behavior of RC coupled shear wall with concealed bracings

A new ductile RC coupled shear wall, named RC coupled shear wall with concealed bracings, is put forward. The experimental study of seismic behavior for 3 four-floor 1/4 scale models of coupled shear wall were carried out. The structural stiffness and its deterioration process, bearing capacity, ductility, energy dissipation, failure mechanism and failure feature were analysed systematically. Through experimental analysis, it proved that there were more prominent effects in improving the bearing capacity, ductility, the structure integer deformation and energy dissipating of shear wall with concealed bracings in the two wall limbs than only with across inclined reinforcement in the coupling beams. And the key point of the RC coupled shear wall with concealed bracings was that concealed bracings could control the failure mechanism of the shear wall rationally. The mechanical model and the calculation formulas of the bearing capacity for RC coupled shear wall with concealed bracings were established as well. The calculated results of bearing capacity of the specimens were found to agree well with the actual measured ones.