横梁均布荷载下单层无侧移刚架稳定承载力研究  

Stability Capacity of Single-Story Non-sway Frame with Uniform Beam Loading

作　　者：张浩[1] 苏明周[1] 程倩倩 李腾飞 ZHANG Hao;SU Mingzhou;CHENG Qianqian;LI Tengfei(School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China)

机构地区：[1]西安建筑科技大学土木工程学院

出　　处：《建筑钢结构进展》2019年第4期94-102,共9页Progress in Steel Building Structures

基　　金：国家重点研发计划课题(2016YFC0701503)

摘　　要：为考虑横梁荷载下单层无侧移刚架的稳定承载力,首先采用转角位移法对横梁荷载下刚架稳定承载力进行分析,明确柱顶作用集中荷载与横梁作用均布荷载下的刚架稳定承载力相差很大。对横梁均布荷载下无侧移刚架的实用计算方法进行阐述,刚架需区分弱梁与弱柱刚架,前者采用梁柱易位法,后者采用传统的标准法确定柱计算长度系数。比较考虑二阶效应与实用计算方法所得柱计算长度系数,计算结果表明,考虑二阶效应将使柱计算长度系数偏于保守,横梁轴压力宜采用一阶分析。其次,采用有限元软件Abaqus分析两种典型无侧移刚架的屈曲性能,验证实用计算方法的正确性。最后,设计了96组算例对刚架类型的实用判别公式进行分析计算,并与有限元分析结果进行对比,验证了实用判别公式的正确性。For calculating stability capacity of single-story non-sway frame with uniform beam loading, the stability capacity of frames with beam loading is analyzed using the slope-deflection method. It is shown that stability capacity changes significantly for concentrate load and uniform load. More realistic calculation method of single-story non-sway frame is introduced. It is necessary to distinguish weak-beam frame from weak-column frame. For calculating column effective length coefficient,weak-beam frame is calculated by the method of transposed position and weak-column frame by code. By comparing column effective length coefficients obtained from two methods, second-order analysis and practical calculation,the results show that the former is conservative, and the axial pressure of beam should apply first-order analysis. Secondly,two typical frame buckling performance is analyzed by Abaqus for verification. Finally, the practical evaluation formulas are analyzed by designing 96 examples and compared with the FEM analysis results, and the correctness of the practical evaluation formulas is verified.

关 键 词：单层刚架 无侧移刚架 计算长度系数 有限元分析 实用判别公式 

分 类 号：TU311.2[建筑科学—结构工程] TU328