钢压弯构件面内等效弯矩系数取值的改进(上)——两端支承的构件  

Improvement of the Equivalent Moment Factor for In-Plane Stability Calculation of Steel Beam-Columns Part (Ⅰ):Members Supported at Both Ends

作　　者：陈绍蕃[1] 

机构地区：[1]西安建筑科技大学结构工程与抗震教育部重点实验室,西安710055

出　　处：《建筑钢结构进展》2010年第5期1-7,共7页Progress in Steel Building Structures

摘　　要：首先阐述两端简支的弹性压弯构件面内等效弯矩系数的理论侧面及公式的简化。考虑了3种不同的加载工况。对于兼承横向荷载和端弯矩的工况,提出应用叠加原理的方法,可以得到简单而精度较好的解。其次,用现有面内稳定极限承载力资料校验建议的计算公式,3种工况都得到满意的结果。最后论证,把简支构件βm系数计算公式中的欧拉临界力改为端部约束杆的临界力,即可推广到构件端部有约束的情况。This article firstly deals with the theoretical aspect of the in-plane equivalent moment factor for elastic beam-columns supported at both ends, as well as the approximation of relevant analytical formulas. Three loading cases have been considered. For members subject simultaneously to end moments and transverse loading, application of the principle of superposition is suggested, leading easily to more precise solution. Secondly, the validity and accuracy of the recommended formulas are checked by available data of the ultimate stability capacity. Satisfactory results are obtained for all the three loading cases. Finally, it is argued that, by changing the Euler critical force into that of members restrained rotationally at the ends, the formulas of βm factor also apply to the latter case.

关 键 词：压弯构件 面内稳定 等效弯矩系数 

分 类 号：TU311.2[建筑科学—结构工程] TU318.01