空间曲折管线支架的上界地震力

UPPER BOUND SEISMIC LOADS ON SUPPORTING FRAMES OF SPATIAL BROKEN PIPELINES

在管线刚度分布不明的情况下确定支架的地震力,传统的分析方法失去效用。本文提出一种新的方法,对文中定义的积函数求极值,便可求得地震反应的上界,设计时只需考虑两个仅有的有贡献的振型。

The conventional methods will never be valid to calculate the seismic responses of supporting frames under the condition of unknown rigidity distribution of the pipelines. In this paper, an approach with novel idea is presented. The upper bound seismic responses can be determined by putting the product function specially defined in this paper in extrema. Only two modes which have contributions to the responses need to be considered in design,as all the other high modes have strictly no contributions.