摘要
楼板有效翼缘宽度是组合框架梁梁端极限承载力验算的关键参数之一,已有的有效翼缘宽度计算公式存在荷载模式不匹配、等效准则不匹配、无法考虑钢梁截面的非对称性等不足。为此,该文重点讨论了侧向荷载作用下采用圆形截面柱的组合框架中非对称钢梁截面框架梁端的承载力极限状态有效翼缘宽度的计算方法。在有限元软件MSC.MARC(2018)中建立精细化数值模型,通过单变量分析筛选出对有效翼缘宽度有显著影响的关键变量。在合理的取值范围内对这些关键变量进行充分的排列组合,得到一系列的数值算例结果。对这些数值结果进行回归分析,基于前人得出的对称钢梁截面情况的计算公式,保留其基本框架而修改其中相关参数,得出侧向荷载作用下非对称钢梁截面组合框架梁有效翼缘宽度的计算方法。
Effective flange width is one of the critical parameters when checking the flexural strength of end of composite frame beams.The existing formulae for effective flange width have inappropriate load case,inappropriate equivalence rule,and thus cannot reasonably consider the non-symmetry of steel sections.Therefore,the main focus of this paper is to study the effective flange width of end of circular-section-column composite frame beams with non-symmetrical steel section under lateral load at ultimate limit state.Elaborate numerical models are established using MSC.MARC(2018)and the critical parameters that significantly affect effective flange width are identified by univariate analysis.An extensive numerical analysis is carried out with varied critical parameters within reasonable ranges.The formulae for effective flange width of the composite frame beams with non-symmetrical steel section under lateral load are put forward by keeping the basic framework which is established in previous research,and modifying some parameters in the formulae for symmetrical steel section through regression of numerical results.
作者
彭炜杰
陶慕轩
PENG Wei-jie;TAO Mu-xuan(Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry,Department of Civil Engineering,Tsinghua University,Beijing 100084,China;Beijing Engineering Research Center of Steel and Concrete Composite Structures,Tsinghua University,Beijing 100084,China)
出处
《工程力学》
EI
CSCD
北大核心
2023年第8期59-67,256,共10页
Engineering Mechanics
基金
国家自然科学基金项目(52178145)。
关键词
钢-混凝土组合结构
框架梁
非对称钢梁截面
极限抗弯承载力
有效翼缘宽度
steel-concrete composite structure
frame beam
non-symmetrical steel section
ultimate flexural strength
effective flange width
