四肢格构式钢管混凝土轴压构件承载力研究  

A Research on the Bearing Capacity of Four-Legged CFST Latticed Members Under Axial Compression

作　　者：杨有福[1] 刘敏[1] 别雪梦 YANG Youfu;LIU Min;BIE Xuemeng(State Key Laboratory of Costal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024

出　　处：《建筑钢结构进展》2022年第5期18-26,共9页Progress in Steel Building Structures

基　　金：国家自然科学基金(51678105)。

摘　　要：鉴于现有标准中的设计公式不适用于计算四肢格构式钢管混凝土轴压构件的承载力,在选择合理钢材和混凝土本构模型的基础上,建立了四肢格构式钢管混凝土轴压构件的非线性有限元模型,并通过现有试验结果验证了模型的准确性,再进一步利用有限元模型确定了四肢格构式钢管混凝土标准轴压短柱的几何条件和强度承载力计算公式,以及四肢格构式钢管混凝土轴压构件的稳定系数和稳定承载力计算公式。结果表明:与现有标准中的设计公式相比,建议公式能够更加准确地预测四肢格构式钢管混凝土轴压构件的承载力,可为相关标准的修订提供参考。Currently the design formulae in the existing standards are not applicable to the calculation of the bearing capacity of four-legged concrete-filled steel tube(CFST)latticed members under axial compression.In this paper,a nonlinear finite element(FE)model of such composite member is built by selecting reasonable constitutive model of steel and concrete,and the accuracy of the model is verified by comparing with available experimental results.Based on the verified FE model,the geometric conditions and the equation for the bearing capacity of the axially compressed fourlegged CFST latticed stub columns,and the formulae for the stability coefficient and the stable bearing capacity are further determined.The results show that,comparing with the design formulae in the existing standards,the formulae proposed in this paper can more accurately predict the bearing capacity of four-legged CFST latticed members under axial compression,and thus can provide a reference for the revision of related standards.

关 键 词：四肢格构式钢管混凝土构件 轴心受压 承载力 有限元模型 计算公式 

分 类 号：TU398[建筑科学—结构工程] TU312