罕遇地震作用下单层框架支撑体系的塑性极限分析

THE PLASTIC LIMIT ANALYSIS OF BRACED-FRAMES STRUCTURE UNDER STRONG SEISMIC ACTION

针对单层框架支撑体系 ,运用结构塑性极限分析原理 ,给出了在罕遇地震作用下可能出现的破坏机构及相应的极限荷载半解析解。通过比较分析 ,得出最可能出现的几种破坏机构 ,从而可求出最小的破坏地震作用。再按刚度分配原则 ,可求出实际结构不形成机构体系可能承受的最大水平地震作用。

The different collapse mechanisms subjected to vertical load and horizontal strong earthquakes are obtained for the single bracedframes system.The semianalytic solution is derived by the way of plastic analysis for ultimate loads of the structures.The most possible collapse mechanisms are found by comparison and the minimum collapse earthquake attack is given.The maximum bearing horizontal seismic actions of a structure that mechanism system is not formed are calculated based on principle of stiffness distribution for a structure.