单层球面网壳结构的柱顶隔震研究

以带下部混凝土支承结构的单层联方型球面网壳为研究对象,针对工程实际中支承刚度过强的情形,提出了柱顶隔震的方法,从而改善了整体结构的抗震性能。非线性时程分析表明,多遇地震作用下LRB能在一定程度上降低支座反力,且使支座反力分布趋于均匀,降低了支座设计的要求;罕遇地震作用下LRB支座基本进入塑性状态,支座反力维持在屈服力附近,与原结构相比有大幅度的降低,支座滞回曲线饱满,同时上部网壳的塑性发展程度大大减轻,基本保持为弹性,取得了良好的减震效果。

A STUDY OF TOP-COLUMN SEISMIC ISOLATION FOR SINGLELAYER RETICULATED DOMES

The research object of this article is single-layer reticulated domes with the concrete supporting structure, in view of the situation that has strong support stiffness in the practical engineering, put forward to improve the performance of the structure in seismic through the method of top-column seismic isolation. Nonlinear time history analysis shows that, under small seismic LRB can reduce the reaction force, and the support reaction force distribution uniform, reduce the bearing design requirements; under major seismic LRB support get into the plastic state, the support reaction force is maintained in the yield force nearby, and is lower than the original structure, hysteresis loop of support is full, while the upper part of the shell plastic development greatly reduced, is essentially elastic, achieved good seismic absorption effect.