基于广义塑性铰线法的压弯钢构件极限承载力计算-《建筑科学与工程学报》

文章信息/Info

Title:: Calculation of Ultimate Bearing Capacity of Steel Beam-columns Based on Generalized Yield Line Method

Author(s):: CHEN Yi-yi, HE Ya-wen; College of Civil Engineering, Tongji University

Keywords:: generalized yield line method; H-section; beam-column; local buckling; interactive effect of plate; ultimate bearing capacity

摘要:: 采用广义塑性铰线法对H形截面钢构件绕强轴压弯区段板件组的极限状态进行了分析，并选用合理假定求解受压翼缘屈曲后达到的极限承载力；分析了表征极限状态截面的应力分布，并研究了周边板件约束与受压翼缘板件厚实程度对屈曲翼缘发展塑性的影响；采用考虑板件屈曲相关的等效荷载法分析了构件截面极限状态应力分布，针对广义塑性铰线法相对于传统塑性铰线法的适用性拓展及其应用现状，分析其存在的问题并做出解答；将计算结果与试验结果及有限元结果进行了对比。结果表明：基于广义塑性铰线法可准确预判构件绕强轴压弯的极限承载力。

Abstract:: The limit state of plate group bending about strong axis of H-section steel beam-columns was investigated based on generalized yield line method. Reasonable assumptions were chosen to solve the ultimate bearing capacity of the compression flange after buckling. The stress distribution of the cross section under the limit state and influences on plastic status of buckling flange derived from the constraint of circumjacent plates and compactness of the compression flange were discussed. A method denoted as “equivalent load method” was proposed describing the stress distribution of the cross section under the limit state considering interactive effect of buckling plates. On the basis of the review on extended applicability of generalized yield line method compared to classical yield line theory, the existing problems of generalized yield line method were analyzed and feasible solutions were proposed. The calculation results were compared with test results and finite element analysis results. Results show that the ultimate bearing capacity of beam-columns bending about strong axis can be accurately predicted based on generalized yield line method.