摘要
纵向框架支撑有两个主要作用:抵抗水平力和保证框架纵向刚度。从整体稳定性角度,考虑交叉支撑和柱顶横系杆的相互影响:通过研究理想体系得到支撑的刚度要求;考虑实际框架中构件初始缺陷,得到水平和竖向荷载共同作用下支撑体系的强度要求。可以发现支撑为保持框架稳定性的承载力要求和抵抗水平力的承载力要求不能直接叠加,水平力降低了框架的抗侧刚度,增大了对支撑的承载力要求。拟合得到水平和竖向力共同作用下支撑承载力要求的计算公式。
Longitudinal bracings are used to carry horizontal loads and to maintain the stability of the longitudinal frame. This paper investigated the stiffness and capacity requirements to be imposed on the bracing system to maintain the stability of the building. The interaction of the cross bracings and the connecting bars at the top of the columns was considered in the derivation. The stiffness requirement was derived from an ideal elastic model. The capacity requirement was derived taking into account the initial imperfections. It is found that the capacity requirement of bracings to maintain the system stability and the capacity requirement to carry the horizontal load are not simply additive. Horizontal loads will decrease the lateral stiffness of the frame and therefore increase the capacity requirement. Explicit formulae are proposed for the capacity requirement of bracing.
出处
《科技通报》
2006年第2期241-246,共6页
Bulletin of Science and Technology
关键词
支撑
稳定性
强度
刚度
水平荷载
竖向荷载
bracing, stability, capacity, stiffness, horizontal load, vertical load
