非对称钢梁截面组合框架梁端极限状态下有效翼缘宽度研究  

Study on effective flange width of end of composite frame beam with non-symmetrical steel section at ultimate limit state

作　　者：彭炜杰 陶慕轩 PENG Weijie;TAO Muxuan(Department of Civil Engineering,Tsinghua University,Beijing 100084,China;Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry,Tsinghua University,Beijing 100084,China;Beijing Engineering Research Center of Steel and Concrete Composite Structures,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学土木工程系,北京100084 [2]清华大学土木工程安全与耐久教育部重点实验室,北京100084 [3]清华大学北京市钢与混凝土组合结构工程技术研究中心,北京100084

出　　处：《建筑结构学报》2023年第5期221-231,共11页Journal of Building Structures

基　　金：国家自然科学基金项目(52178145)。

摘　　要：针对工程中常用的上翼缘小而下翼缘大的非对称截面钢梁,为了得到对应的混凝土楼板的有效翼缘宽度,基于已有对于对称钢梁截面情况的研究与相应的公式,通过精细化有限元参数分析修正相关系数,在有限元软件MSC.MARC(2018)中建立精细化数值模型,识别出影响极限状态有效翼缘宽度的主要变量,包括钢主梁的上下翼缘宽度、钢横梁的上翼缘宽度。对数值算例结果进行回归分析,得出非对称钢梁截面组合框架梁梁端极限状态有效翼缘宽度的计算方法。结果表明:建议公式计算的正弯矩和负弯矩下的有效翼缘宽度均满足工程精度要求,与已有研究和规范公式对比,研究中的建议公式计算得出的相对误差和离散性均最小。This study aims to obtain the effective flange width of the concrete floor slab for the non-symmetrical steel section beam with the top flange being smaller than the bottom flange,which is commonly used in the practice.Based on the previous study on the effective flange width of the composite frame beam with symmetrical steel section at the ultimate state,the relevant coefficients were modified by a parameter analysis using sophisticated finite element modelling.The critical parameters that affect the effective flange width at ultimate limit state were identified by sophisticated finite element analysis using MSC.MARC(2018),which include the width of the top and bottom flanges of the steel girder and the width of the top flange of the steel cross beam.The formulae were proposed for the effective flange width of end of composite frame beam with non-symmetrical steel section at the ultimate limit state based on regression of the numerical results.The results show that the effective flange widths obtained the proposed formulae meet the accuracy requirements for engineering under both positive and negative bending moments.Compared with formulae from the existing studies and codes,the proposed formulae have the smallest relative errors and dispersion.

关 键 词：钢-混凝土组合结构 框架梁 非对称钢梁截面 有效翼缘宽度 受弯承载力 

分 类 号：TU398.9[建筑科学—结构工程]