摘要
大跨越输电塔线体系塔身极高,塔线耦合作用显著,抗震分析时需采用精细的三维有限元方法。针对某大跨越输电塔线体系,采用振型分解反应谱法和时程分析法进行考虑三向输入的地震响应研究。自重作用下塔线体系各杆件的轴应力比单塔体系大。地震作用下两种体系各杆件轴应力的差别不大,但对于支座的基底剪力,塔线体系的结果比单塔体系小。同时两种计算结果之间的可比性很好,说明方法应用和计算过程的准确性。
For the long-span transmission tower, whose height is large, the coupling effect of tower and line is prominent, and 3D Finite Element Method is required to analyze its seismic responses. In order to study the seismic behavior of a long-span transmission tower-line system, the mode-decomposition method and time-history analysis method are both employed considering three-dimensional earthquake excitation effect. Under gravity load, the tower-line system develops larger axial stresses and smaller shear forces in members than single tower does, but they are almost equal under earthquake load. The seismic results obtained from the mode-decomposition method and time-history analysis method are well matched, which indicates the correctness of the analysis.
出处
《工程力学》
EI
CSCD
北大核心
2008年第11期212-217,共6页
Engineering Mechanics
基金
国家自然科学基金项目(50608063,50638010)
关键词
输电塔
地震
大跨越
有限元
塔线体系
transmission tower
earthquake
long-span
finite element method
tower-line system
