双向偏压方钢管混凝土柱三面受火耐火性能有限元分析  

Finite Element Analysis on Fire Resistance of Square CFST Columns with Biaxial Eccentric Loading under Fire on Three-surface

作　　者：张波 徐光朋 任庆新[1] 刘香余 ZHANG Bo;XU Guangpeng;REN Qingxin;LIU Xiangyu(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,China,110168;Liaoning Qingchuang High-tech Building Industrialization Consulting Co.Ltd.,Shenyang,China,110179)

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]辽宁清创高科建筑工业化咨询有限公司,辽宁沈阳110179

出　　处：《沈阳建筑大学学报（自然科学版）》2023年第1期9-16,共8页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(51808351)。

摘　　要：目的 研究双向偏压方钢管混凝土柱在三面受火作用下的耐火性能,为该类型结构的工程应用提供理论依据。方法 采用ABAQUS软件建立双向偏压方钢管混凝土柱三面受火的热学分析模型与力学分析模型,分析其受力机理及常见参数对其耐火极限的影响。结果 荷载偏心角、荷载比、长细比、截面边长和偏心率是影响构件耐火极限的主要参数,荷载偏心角越大,荷载比越大,长细比越大,截面边长越小,其耐火极限越小。偏心率在0~0.3区间存在明显的极强中心,其耐火极限最大,可比轴压时提高80%以上。结论 在参数分析范围内,提出的耐火极限简化计算公式与有限元计算结果吻合较好。The fire resistance performance of square concrete-filled steel tubular(CFST)columns with biaxial eccentric loading under fire on three-surface is studied to provide a theoretical basis for the application of this type of structure in engineering.The thermal analysis model and mechanical analysis model of square CFST columns with biaxial eccentric loading under fire on three-surface are established by ABAQUS,and its stress mechanism and the influence of common parameters on its fire resistance limit are analyzed.Load eccentric angle, load ratio, slenderness ratio, section side length and eccentricity are the main parameters that affect the fire resistance of members.The greater the load eccentric angle, the load ratio and the slenderness ratio, the smaller the side length of the section, and the smaller the fire resistance limit.When the eccentric ratio is 0~0.3,there is a very strong center, and the maximum fire resistance can be increased by more 80% than that of the axial pressure.Within the range of parameter analysis, the simplified calculation formula of fire resistance limit proposed is in good agreement with the results of finite element calculation.

关 键 词：双向偏压 方形截面 钢管混凝土柱 三面受火 耐火极限 

分 类 号：TU391[建筑科学—结构工程]