钢管混凝土格构式柱受力性能研究

为研究不同含钢率对钢管混凝土格构式柱受力性能的影响,对4个不同含钢率试件在单向水平荷载和水平循环荷载作用下进行了非线性有限元分析.结果表明:含钢率对钢管混凝土格构式柱的刚度影响比较显著.随着含钢率的增加,钢管混凝土格构式柱无论在弹性阶段还是在非线性强化阶段,其刚度均有所提高,承载能力和极限位移也同时提高.但是当含钢率增大到一定程度,再增加含钢率,钢管混凝土格构式柱的极限承载力和刚度提高的幅度反而会降低.延性性能和耗能性能增加的幅度也同时会降低.为提高结构的安全性和可靠性,实际工程钢管混凝土格构柱的设计过程中,要控制合理的含钢率.

Research on mechanical behavior of concrete-filled rectangular steel tubular columns

In order to analysis the influence of different steel ratio to concrete filled steel tubular（CFST）laced columns under horizontal loading and cyclic loading,the nonlinear finite element analysis was applied to four different CFST of steel rate.The results showed that： the steel ratio significant influenced the stiffness of CFST.With the increase of steel ratio,the rigidity of CFST carrying capacity and ultimate displacement increased in terms of enhanced flexibility phase or the nonlinear stage,However,when the steel ratio increased to a certain extent,the increase rate of strength and stiffness would decrease.Ductility and energy dissipation rate of increase would also be reduced.Therefore,in order to improve the safety and reliability of structural,the actual construction of concrete lattice steel columns in the design process must to control a reasonable rate of steel ratio.