带竖缝钢筋混凝土剪力墙板的简化静力分析模型

带竖缝钢筋混凝土剪力墙板在弹性状态下有较大刚度,而在弹塑性状态下又有较好的延性,是一种抗震性能较好的结构单元。但由于缺少有效的分析模型,带竖缝钢筋混凝土剪力墙板在国内的工程应用很少。根据带竖缝钢筋混凝土剪力墙板的V-u曲线,按照侧向刚度相同的原则将之等效为偏心交叉支撑简化模型,并给出了简化模型的截面特性和材料本构关系曲线。通过算例统计分析给出了偏心距的取值范围及简化分析模型的适用范围。与更接近于实际墙板特性的等效带竖缝板模型的算例对比分析表明,在框架结构静力分析中采用简化模型模拟带竖缝钢筋混凝土剪力墙板是可行的。

A simplified model for static analysis of slit RC shear walls

Slit RC shear walls,which have appropriately large lateral stiffness in elastic state and good ductility in inelastic state,may serve as desirable aseismic structural members.However,there are few applications of slit RC shear walls in China due to lacking an effective model for global structural analysis.A simplified model,i.e.,an eccentric cross-bracing model,is proposed to represent the structural actions of the slit RC shear wall in a global analysis.The model is established on the basis of an equivalent lateral stiffness according to the shear force versus lateral deflection curve of the slit RC shear walls.Both section characteristics and material constitutive curve of the simplified model are introduced.Numerical examples involving both the simplified model and a more accurate model,named the equivalent slit panel model,are presented to demonstrate the accuracy of the simplified model.According to the statistical results of the numerical examples,the range of brace eccentricity and the applicability of the simplified model are identified.Numerical results indicate that the simplified model of a slit RC shear wall can be effectively utilized for the global static analysis of frame structures.