支撑布置对钢框架结构抗侧刚度的影响

纯钢框架建筑结构体系刚度较小,层间位移起主要控制作用,设置支撑体系可有效地提高结构的整体抗侧刚度,减少结构用钢量。以广泛应用的多高层钢框架支撑结构为对象,通过计算不同支撑类型及支撑布置方式下钢框架支撑结构的顶点位移,研究了支撑形式对多、高层钢框架结构抗侧刚度的影响。研究结果表明,对于不同的支撑类型,支撑沿竖向集中布置于中间跨的钢框架结构抗侧移刚度好于将支撑布置在边跨以及其他跨上。对于相同的支撑布置方式,不论是中心支撑,还是偏心支撑,在抗侧刚度和经济性方面,人字形支撑框架均好于单斜杆支撑框架。

EFFECTS OF LAYOUT OF BRACING ON LATERAL STIFFNESS OF STEEL FRAMES

Since its low lateral stiffness,the inter-storey drifts of an un-braced steel-frame building usually become key factors in structural design.Adding bracing to the structure is an effective measure which can improve the overall lateral stiffness and decrease the steel-consumption.The multi-storey and high-rise braced steel-frames are taken as an object,through calculating the top displacements of the steel-frames braced by different types and layouts of bracing,it studied the influence of bracing kinds on the lateral stiffness of the multi-storey and high-rise braced steel-frames.The results shows that,for different kinds of bracing,the lateral stiffness of a steel frame with bracings on middle spans is higher than that on side spans or other spans;for the same layouts of bracing,either centrically braced frame,or eccentrically braced frame,in the facets of lateral stiffness and economy,herringbone braced frame is better than single sway rod braced frame.