高层结构偏心受拉剪力墙的抗震分析与应用研究

Seismic Analysis and Application Research on Eccentric Tensile Shear Wall of high-rise structure

剪力墙拉应力过大导致墙身抗剪承载力大幅下降而出现裂缝,抗侧刚度急剧退化形成脆性破坏,该问题在高层及超高层结构设计中应引起足够的重视。本文通过对剪力墙体系的简化力学模型分析,得到了影响结构底部是否受拉及拉力大小的因素,通过对典型高层结构若干剪力墙分析,得到了影响剪力墙构件拉应力大小的因素。采用有限元软件模拟受拉剪力墙构件在单调加载和滞回加载的受力过程可知,拉力将大幅减少普通剪力墙的抗剪承载力,设置型钢可大幅提高剪力墙的抗剪承载力,但当拉应力比过大时,增设型钢的效果也较有限;设置型钢可大大增加剪力墙的滞回耗能能力;增设型钢可使得剪力墙混凝土应变分布较为均匀连续,且有较好的受力形态。对设计规范中偏心受拉剪力墙的计算公式进行理论分析,并结合有限元模拟的结果得出受拉墙肢拉应力比的控制指标,给出了剪力墙受拉状态的调整方法及对受拉剪力墙增设型钢的量化建议,可供设计参考。

When shear stress of the shear wall is too large, the shear strength of the wall will sharply decrease, causing the appearance of cracks and deterioration of lateral stiffness and brittle failure of the wall This problem should be paid enough attention in the design of high-rise and super high-rise buildings By analyzing the simplified mechanical model of the shear wall system, the factors that affect the situation of tensile in the bottom of the structure are obtained By analyzing the shear walls of typical high-rise buildings, the factors that affect the size of tensile stress of the shear walls are obtained By using ABAQUS to simulate the shear wall components under monotonic and hysteretic loading, the tension will significantly reduce the shear capacity of RC shear wall can be found out , but its shear capacity can be improved by setting up steels in the walls However this measure could achieve little effects when the tension is too large In addition, setting up steels in the walls can greatly increase the hysteretic energy dissipation capacity, which can make the strain distribution of concrete of the walls more uniform and continuous The adjustment method of the shear wall＇s tensile state is given, and the quantitative suggestion for setting up steels in shear wall is proposed by analyzing the calculation formula of eccentric tension shear wall in design code and the results of ABAQUS simulation, which can be used for reference in design .