压弯荷载作用下内置T肋方钢短柱的承载力与延性性能  

Load-carrying Capacity and Ductility Behavior of Steel Square Stub Column with T-shaped Stiffeners Under Compression and Bending Loads

作　　者：董江磊 高圣彬 高玉学 DONG Jianglei;GAO Shengbin;GAO Yuxue(School of Civil Engineering,Shanghai Normal University,Shanghai 201418,China)

机构地区：[1]上海师范大学建筑工程学院,上海201418

出　　处：《河北工程大学学报（自然科学版）》2024年第3期16-22,共7页Journal of Hebei University of Engineering:Natural Science Edition

基　　金：国家自然科学基金资助项目(51778361)。

摘　　要：为研究内置T肋方钢短柱在承受压弯荷载作用下的承载力与延性性能,建立了考虑初始几何缺陷和焊接残余应力的内置一字肋方钢短柱的三维弹塑性有限元分析模型,通过与既有研究结果比较,验证了有限元分析模型的准确性;采用参数化分析的方法对内置T肋方钢短柱的三维有限元模型进行分析,探究翼缘正则化宽厚比、加劲肋正则化长细比以及轴压比等参数对方钢短柱最大受弯承载力和极限应变的影响规律;基于参数化分析结果,提出了预测该类方钢短柱最大受弯承载力和极限应变的计算公式。研究结果表明,随着翼缘正则化宽厚比、加劲肋正则化长细比与轴压比的减小,内置T肋方钢短柱的最大受弯承载力与延性性能得到提升。In order to study the load-carrying capacity and ductility behavior of steel square stub columns with T-shaped stiffeners under combined compression and bending loads,a three-dimensional elastic-plastic finite element analysis model of steel square stub columns with rectangular stiffeners was established,taking into account initial geometric defects and welding residual stresses.The accuracy of the finite element model was verified by comparing it with existing research results.A series of parametric studies were carried out to investigate the effect of normalized flange width-thickness ratio,normalized stiffener’s slenderness ratio and axial compression ratio on the maximum flexural capacity and ultimate strain of steel square stub columns with T-shaped stiffeners.Based on the results of the parametric analysis,the calculation formulas for predicting the maximum flexural capacity and ultimate strain of these stub columns were proposed.The research results indicate that as the normalized flange widththickness ratio,normalized stiffener’s slenderness ratio and axial compression ratio decrease,the maximum flexural capacity and ductility behavior of steel square stub columns with T-shaped stiffeners are improved.

关 键 词：T形加劲肋 参数化分析 最大受弯承载力 极限应变 

分 类 号：TU391[建筑科学—结构工程]