【摘要】 目前,用于钢管混凝土框架结构动力时程分析的计算理论模型主要有:纤维模型和三维有限元模型,三维有限元模型计算量大,且数值计算收敛困难,在钢管混凝土结构动力时程分析中的应用受到一定限制。为了研究钢管混凝土框架结构在地震作用下的抗震性能,本文在构件层次上运用OpenSees计算平台中的非线性纤维梁-柱单元对钢管混凝土框架结构进行模拟计算,通过对其他研究者完成的某模拟地震振动台试验钢管混凝土框架模型进行数值模拟,输入不同工况的地震波对该模型进行了动力时程分析,总体上数值模拟结果和试验结果吻合较好,表明基于OpenSees平台的非线性纤维模型方法能够较好地模拟钢管混凝土框架结构的动力特性。更多还原

【Abstract】 There are two main kinds of approach to simulate the dynamic behavior of the concrete filled steel tubular(CFST) frame structures,i.e.,three dimension finite element method and fiber model based on nonlinear fiber beam-column.The three dimension finite element method is limited to be used because of it’s computational efficiency and convergence.In order to study the seismic performance of the CFST frame structures,the nonlinear fiber beam-column element based on the OpenSees platform is used in this paper.A typical frame structure model with circular CFST columns which is performed shaking table test by the other researcher is used to verify and simulate under different earthquake waves.The numerical results are match well with the tested results in general.It shows that the nonlinear fiber beam-column model can simulate the dynamic behavior of the CFST frame rationally and logically.更多还原