单层厂房剪-扭振动抗震简化分析

邢台、海城、唐山等地震中,一些非对称单层厂房的破坏状况,表明了各层屋盖在产生水平变形的同时,还伴生整体转动。为了确切反映地震期间厂房的剪-扭振动,本文提出非对称空间结构力学模型、“串并联多质点系”计算简图及抗震空间分析方法。按照抗震规范修订要求,利用计算机,对420例厂房进行空间分析和单榀排架分析的对比计算,据此给出便于手算的简化方法。

Seismic Spatial Analysis and Its Simplified Calculation for Unsymmetrical Single-Story Mill Building

Many single-story mill buildings were destroyed in Tangshan,Hai-cheng and Xingtai Earthquakes. In these buildings the damage of corner columns and columns remote from the terminal transverse wall are more serious than others. It means that the roof slabs were deformed and rotated in horizontal plane during earthquakes. According to the experimental data and conclusions drawn from the earthquake damage surveys, a spatial structural mechanical model in consideration of lateral stiffness of transverse masonry wall and its spatial action and rotational effect of roof slab has been established in the paper. The calculating scheme with "series-parallel multiple mass particles system" is adopted in the translation-torque coupling earthquake response analysis for single-story unsymmetrical mill buildings. A practical method according to the earthquake response spectrum is also given. Based on the calculation results of spatial analysis of several hundreds mill buildings, some applicable tables are made and a simplified method for manual calculation is presented in the paper as well.