翼缘约束对波形钢腹板弹性剪切屈曲的嵌固效应  

Embedding Effect of Flange Restraint on Elastic Shear Buckling of Corrugated Steel Webs

作　　者：张博珊 蔚江江 陈惟珍[1] ZHANG Boshan;YU Jiangjiang;CHEN Weizhen(Department of Bridge Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学桥梁工程系,上海200092

出　　处：《结构工程师》2022年第6期15-22,共8页Structural Engineers

基　　金：国家自然科学基金项目(52108168)。

摘　　要：现有波形钢腹板剪切性能设计和评估公式,是基于四边简支波形板或具有某种特定翼缘的波形钢腹板工字梁分析结果提出的,不能合理反映翼缘约束对波形钢腹板剪切屈曲的嵌固效应。弹性剪切屈曲是波形钢腹板剪切性能研究的重要基础。本文采用通用有限元分析软件ANSYS,通过特征值屈曲分析,对9组四边简支波形板模型和63组波形钢腹板工字梁模型的弹性剪切屈曲行为进行模拟。分析模型按腹板波形和腹板长宽比划分为9个系列。通过对各系列模型翼缘尺寸的参数化分析,探索翼缘约束作用及其对波形钢腹板弹性剪切屈曲应力的影响规律。提出了翼缘约束程度的定量化评价参量及其对波腹板弹性剪切屈曲嵌固效应的定量化评价系数。研究结果表明,翼缘约束对波形钢腹板的弹性剪切屈曲具有嵌固效应,波腹板的弹性剪切屈曲应力高于相应的四边简支波形板。Existing design and evaluation formulas for shear behavior of corrugated steel webs are mainly based on analyses of simply-supported corrugated plates or corrugated steel webs in I-beams with specific flanges, which could not refeclt the influence of flange constraint on shear buckling. Elastic shear buckling is the important basis for shear behavior of corrugated steel webs. In this paper, the elastic shear buckling behavior of 9 groups of four-edge simply-supported corrugated plates and 63 groups of I-beams with corrugated steel webs were simulated by the finite element analysis software ANSYS, adopting the eigenvalue buckling analysis. The models were divided into 9 series according to the web profiles. Based on the parametric study of flange dimentions, flange restraint and its influence on elastic shear buckling stress of corrugated steel webs were explored. The coefficients to describe the flange constraint level and the embedding effect were proposed.The results showed that the flange restraint had embedding effect on elastic shear buckling of corrugated steel webs, thus the elastic shear buckling stress of the corrugated web in an I-beam was higher than that of a simply-supported corrugated plate.

关 键 词：剪切屈曲 数值分析 波形钢腹板 嵌固效应 翼缘约束 

分 类 号：U441[建筑科学—桥梁与隧道工程]