非对称单层厂房剪扭振动地震反应

在海城、唐山地震中大量单层厂房的破坏情况表明,厂房发生侧移和扭转振动的同时,屋盖自身还产生显著的纵向和横向水平变形。一些厂房的实测变形曲线和屋盖动力实验,则进一步给出了屋盖水平刚度的具体数值。为了确切反映非对称单层厂房的实际振动性状,合理确定构件地震内力,本文提出考虑厂房扭转、屋盖变形和围护墙刚度三要素的空间结构力学模型和“串并联多质点系”计算简图,进行双向地面平动分量作用下的三维振动分析。实例计算表明,此方法能较好地反映单层厂房的震害规律。

Seismic Analysis of Asymmetric Mill Buildings in Shear-Torsion Vibration

Earthquake damages of a great deal of single-story mill buildings show that once the side-sway and torsion are occurring in the vibration of the building, the horizontal deformation of the roefing in both transverse and longitudinal direction are produced. According to the measured datas of dynamic experiment and the horizontal deformation curve of the roof slab of several existing single-story mill buildings, the approximate value of horizontal stiffness of roof slab is obtained.In this paper, appropriate mechanical model in consideration of torsion and roof deformation and effective stiffness of brick masonry Avail is set up, and the "series-parallel multiple lumped-mass system" is used for three-dimensional seismic analysis of spatial structure subject to two-way ground motion. The calculating results are approximately quite close to the rules of earthquake damages of sigle-story mill buildings in Tangshan earthquake.