弯曲缩短对杆件结构非线性分析的影响  

EFFECT OF CURVATURE SHORTENING ON NONLINEAR RESPONSE OF FRAME STRUCTURES

作　　者：刘永华[1] 张耀春[2] 

机构地区：[1]天津城市建设学院土木工程系,天津300384 [2]哈尔滨工业大学(威海)土木工程系,山东威海264209

出　　处：《工程力学》2013年第7期61-67,共7页Engineering Mechanics

基　　金：国家自然科学基金项目(51108300)

摘　　要：为了考察弯曲缩短对杆件结构非线性分析的影响(弓形效应),利用ANSYS用户可编程特性(UPFs)研究了考虑弓形效应的实用方法,采用ANSYS数值模拟方法对若干杆件结构算例进行了弹性及弹塑性大位移分析。算例分析结果表明:对于扁平刚架等易发生跃越失稳的结构,弯曲缩短的影响大,分析时应予以考虑;而对于普通矩形框架结构,弯曲缩短的影响可以忽略不计。采用弓形函数的近似表达式可有效考虑弯曲缩短效应。To investigate the bowing effect of frame structures, practical methods for taking into account bowing effect are studied by using User Programmable Features （UPFs） of ANSYS program. Elastic and non-elastic large displacement analyses are performed for several frame structures taking advantage the numerical analysis of ANSYS. The numerical results show that bowing effect is considerable for shallow frame structures, in which snap-through buckling is likely to happen, thus bowing effect should be accounted for in the analysis of this kind of structures. However, for rectangular frames, bowing effect is negligible in most cases. The approximate expressions of bowing functions can account for bowinz effect effectively.

关 键 词：弯曲缩短 弓形效应 杆件结构 非线性分析 转角-位移方程 ANSYS用户可编程特性 

分 类 号：TU323.5[建筑科学—结构工程]