半刚接钢框架内填暗竖缝混凝土剪力墙结构的简化滞回分析模型

Composite inclined strut hysteretic model for partially-restrained steel frame with concealed vertical slit reinforced concrete infill walls

为解决半刚接钢框架内填暗竖缝混凝土剪力墙结构(简称PSRCW)在工程应用中的数值分析问题,根据PSRCW结构试验所获得的破坏模式、钢筋混凝土(RC)墙的裂缝分布规律和结构传力机理,提出了可用于分析PSRCW结构抗震性能的组合斜压带滞回模型。暗竖缝RC墙组合斜压带滞回模型主要由两部分构成。(1)主对角斜压带部分,用于模拟暗竖缝对PSRCW结构水平承载力的贡献。(2)壁柱部分,用于模拟缝间墙的力学行为。基于暗竖缝RC墙的受力机理推导了主对角斜压带的有效宽度计算方法,并结合混凝土的应力-应变关系给出了主对角斜压带的滞回恢复力模型。采用组合斜压带模型模拟了已有的典型试验,并与试验结果进行了比较,两者吻合较好,进一步证实了本文所提出的组合斜压带滞回模型的合理性。

To solve numerical simulation of partially-restrained （PR） steel frame with concealed vertical slit reinforced concrete （RC） infill walls （PSRCW） in the engineering design stage,a simplified compo- site inclined strut hysteretic model was proposed based on the experimental phenomena, the cracks distri- bution of RC infill wall, and the transferring mechanism of PSRCW. The simplified composite inclined strut hysteretic model of concealed vertical slit RC infill wall was simulated via two parts. The main diagonal inclined strut was used to reflect the transferring lateral force by the contribution of the thick- ness of concealed vertical slits. The wall-column part was to simulate the mechanical behavior of slit walls. The effective width of the main diagonal inclined strut was deduced through the internal mechanism of the concealed vertical slit RC infill walls,and the cyclic restored force model of the main diagonal inclined strut was deduced based on the stress vs. strain relationship curves of concrete. In addition,the comparison between the results of calculation using the composite inclined strut hysteretic model and those of corresponding tests showed good agreement.