一、前言在单层工业厂房中,柱间支撑是保证厂房纵向刚度和抵抗纵向地震荷载的主要受力构件之一。因它不属于车间主体承重构件,也就允许在地震过程中产生较大的塑性变形来消耗地震能量,震后拆换较易。现在采用的柱间支撑大多是交叉撑的型式,这种型式支撑在唐山地震(天津地区)有明显而普遍的震害,表现在杆件弯曲(图1)和部分节点破坏。震害表明:支撑拉杆在临震中产生塑性变形—它随着厂房振动次数的增加、加大而增长。反向受压时,残余变形并不消失。这样就使拉杆必须拉直以后 I. INTRODUCTION In a single-story industrial plant, support between columns is one of the main force components that ensure the longitudinal stiffness of the plant and resist longitudinal earthquake loads. Because it does not belong to the main body load-bearing components of the workshop, it also allows large plastic deformation during the earthquake process to consume seismic energy. Most of the intercolumn bracings currently used are of the cross bracing type. This type of bracing has obvious and widespread earthquake damage in the Tangshan earthquake (Tianjin region), which is manifested in the bending of the bar (Figure 1) and the destruction of some of the nodes. Earthquake damage shows that the support rods are plastically deformed during the impending earthquake — it grows as the number of vibrations in the plant increases and increases. When the pressure is reversed, the residual distortion does not disappear. In this way, the lever must be straightened