冷弯薄壁卷边Z形钢梁的弹性畸变屈曲荷载  

DISTORTIONAL BUCKLING LOADS OF COLD-FORMED LIPPED ZED-BEAMS

作　　者：姚谏[1,2] 程婕[2] 卢哲刚[2] 

机构地区：[1]浙江树人大学城建学院,杭州310015 [2]浙江大学结构工程研究所,杭州310027

出　　处：《工程力学》2013年第1期81-86,共6页Engineering Mechanics

摘　　要：该文以既有理论研究成果为基础,结合应用广义梁理论,对两端简支的冷弯薄壁卷边Z形钢梁在绕截面强轴弯矩作用下的弹性畸变屈曲荷载进行了深入细致的分析。通过对45个截面的参数分析,将原先适用于冷弯薄壁卷边槽钢梁的参数计算公式推广应用于Z形钢梁,并根据Z形钢截面的几何特性对相应参数进行了重新推导和修改。利用以上结果,最后提出了冷弯薄壁卷边Z形钢梁在绕强轴弯矩作用下的弹性畸变屈曲荷载简化计算公式。简化公式具有足够的精度、便于手算、实用性强,可供工程设计人员和各国冷弯薄壁型钢设计规范修订相应内容时参考采用。This paper presents a set of simple formulae for the elastic distortional buckling load of simply supported cold-formed lipped zed-beams subjected to major axis bending. These formulae are derived on the basis of an existing theoretical solution in conjunction with numerical results obtained using the Generalized Beam Theory （GBT）. Firstly, numerical results for the distortional buckling loads of forty five sections from GBT analysis are presented and interpreted, and then the formulae, which are used to calculate the parameters of cold-formed lipped channels, are modified according to the unique geometric properties of zed-sections. Based on these approximate expressions, a simplified equation is finally presented to predict the elastic distortional buckling load of cold-formed lipped zed-purlins subjected to major axis bending. This formula is shown to be accurate through comparisons with results from GBT analysis. The proposed formula is easy to apply, and may be directly used in practical design and incorporated into future design codes or guidelines.

关 键 词：冷弯薄壁型钢 卷边Z形钢檩条 绕强轴弯矩 畸变屈曲 简化计算公式 

分 类 号：TU318[建筑科学—结构工程]