矩形钢管混凝土键连接剪力墙框架柱的力学性能研究

Study on Mechanical Properties of Shear Wall and Frame Column Connected with CFRSTS Keys

目的研究矩形钢管混凝土键连接装配式混凝土结构框架柱和剪力墙的力学性能,分析不同参数对其影响,为该类结构连接提供设计依据.方法设计了19个采用矩形钢管混凝土键连接的墙柱试件,利用有限元方法模拟各试件在单调荷载加载下的受力过程,分析不同参数对荷载-位移曲线的影响.结果矩形钢管混凝土键连接墙柱的构件与现浇构件相比,延性很高,最大承载力较高,屈服荷载偏低;键的截面高度增加,构件承载力增加,初始刚度增加,延性系数不变;截面宽度增加,承载力增加,初始刚度不变,延性系数减小;键的长度增加,承载力基本不变,初始刚度减小,延性系数增加;混凝土强度对构件的抗剪承载力和初始刚度影响很小;键的纵向间距对构件的荷载-位移曲线几乎没有影响.结论矩形钢管混凝土键的截面高度是影响承载力的主要因素、长度是影响延性的主要因素.

In order to study the mechanical properties of prefabricated concrete column and shear wall connected with concrete rectangular filled steel tube(CFRST)keys and provide reference for designing,how the different factors influencing the load-displacement curves are analyzed and the main factors affecting the shear performance of such members are found out.19 such specimens are designed.Finite element method is used to simulate the load-bearing process of these specimens under monotonic load.The influence of different parameters on the load-displacement skeleton curves is analyzed.It shows that compared with cast-in-place member,prefabricated concrete frame column and shear wall connected with CFRST keys has high ductility,high maximum bearing capacity and low yield load.With the increasing of the section height of the keys,the bearing capacity and the initial stiffness of the member increases,but the ductility coefficient is not varied.With the increasing of the section width,the bearing capacity increases,and the initial stiffness does not change,yet the ductility coefficient decreases.With the increasing of the connection length,the bearing capacity is basically unchanged,and the initial stiffness decreases,yet the ductility coefficient increases.The concrete strength has little effect on the shear capacity and the initial stiffness of the member.The vertical spacing of the keys has little effect on the load-displacement skeleton curve.It can be concluded that the section height of the CFRST keys is the main factor affecting the bearing capacity,and the length of them is the main factor affecting the ductility.