【摘要】 本文采用梁单元、杆单元和索单元的混合有限元模型,对大跨度斜拉立体桁架进行了动力分析。首先,研究了结构的自振特性;然后,采用振型分解反应谱法和时程分析法分析了在竖向地震作用下,大跨度斜拉立体桁架内力系数的大小和分布规律,给出了竖向地震作用系数表,供工程设计人员参考。更多还原

【Abstract】 Mixed finite element method of spatial beam,rod and cable elments is applied to analyze the dynamic properties of long span cable-stayed space truss in this paper.Firstly free vibration behavior is conducted.Then the magnitude and distribution of vertical seismic internal force coefficient are studied by using response spectrum method and time history method under vertical earthquake.The table for vertical seismic internal force coefficient was given and could offer reference for design engineers.更多还原