钢管混凝土剪力墙竖向接合面抗剪机理分析

SHEAR MECHANISM OF VERTICAL JOINTS FOR SHEAR WALL WITH CONCRETE FILLED STEEL TUBE COLUMNS

钢管混凝土剪力墙以其侧向刚度大、承载力高及多道抗震防线等特点,常作为主要抗侧力结构构件被广泛应用于高层建筑中。为研究钢管混凝土剪力墙中钢管混凝土边框或暗柱与剪力墙竖向接合面的抗剪机理以及该竖向接合面抗剪承载力计算方法,基于ABAQUS软件对钢管混凝土剪力墙竖向接合面进行有限元分析,同时考虑钢管混凝土与剪力墙之间有无连接的影响。结果表明:该竖向接合面有无连接对两者脱开裂缝宽度影响显著。在以往试验研究基础上,提出了钢管混凝土剪力墙竖向接合面抗剪承载力计算模型,并对其抗剪机理进行分析,依据该计算模型对19个接合面和7个墙体试件抗剪承载力进行计算,所得结果与试验结果吻合较好,能够合理反映钢管混凝土剪力墙的实际工作形态,对其抗剪性能的计算分析精度高、实用性强。

Shear wall with concrete filled steel tube columns is widely used in high-rise buildings as the common members of resisting horizontal force, because of its great lateral stiffness, high load carrying capacity and multiple seismic fortifications. In order to study the shear mechanism of vertical joint surface of concrete filled steel tube columns and shear wall in the structure, and the computing methods of the bearing capacity, finite element analysis of the vertical joint surface model for concrete filled steel tube shear wall was conducted by ABAQUS software, the effect of connection design was considered, and the results showed that the joints connecting design had significant effects on the crack width. The shear bearing capacity calculation model of shear walls with concrete filled steel tube joint surface was presented based on the existing experimental results, and the shear mechanism was analyzed, and the calculation results according to the calculation model agreed well with the tests results for 19 joints specimens and 7 wall specimens, and then the model could be used to analyze the actual working performance of the vertical joints with high precision.