侧向支撑对楔形梁整体稳定性的有限元分析  

FINITE ELEMENT ANALYSIS OF OVERALL STABILITY OF TAPERED BEAM WITH LATERAL BRACINGS

作　　者：刘茉[1] 樊江[1] 陈光[1] 

机构地区：[1]昆明理工大学建筑工程学院,昆明650224

出　　处：《工业建筑》2010年第S1期459-465,共7页Industrial Construction

摘　　要：借助ANSYS有限元分析软件,分析侧向支撑对钢结构中腹板高度线性变化的简支双轴对称工字型楔形梁的整体稳定性能的影响,着重研究楔形梁的楔率及两端不等端弯矩比值变化时,侧向支撑个数、间距及作用位置的改变对其整体稳定性能的影响,找到楔率、不等端弯矩比值的不同组合下,支撑间距为多少时可忽略支撑个数增加对楔形梁整体稳定性能的影响。研究发现,当支撑作用在楔形梁上翼缘时,满足要求的支撑间距及个数要根据楔率和不等端弯矩的比值情况而定;当支撑作用在楔形梁下翼缘时,以3 m为间距布置支撑已经足够保证梁的整体稳定性,且数量较为合理。Using the finite element program ANSYS analysed overall stability of the doubly-symmetrical simply supported tapered I-beam with tapered web in steel struc tures.Research focuses on the effect factors of tapered beam's overall stability,such as taper、moment gradient ratio,the number of lateral bracing,the spacing of lateral bracing and the location of lateral bracing.It is tried to find the spacing of lateral bracing that continue to increase the number of lateral bracing can't influence overall stability of tapered beam.The study found that the spacing of lateral bracing based on taper and moment gradient ratio when the lateral bracing acts on top flang.But when the lateral bracing acts on bottom flang,the spacing of lateral bracing can be 3 m and the number is more reasonable.

关 键 词：楔形梁 侧向支撑 整体失稳临界荷载 有限元分析 

分 类 号：TU391[建筑科学—结构工程]