全过程火灾后中空夹层高强钢管混凝土偏压短柱力学性能研究  

Eccentric compressive properties of concrete filled double-skin high-strength steel tubular short columns after the full-course fire

作　　者：李业峰 毛小勇[1,2] 刘晓 刘昭辉[3] LI Yefeng;MAO Xiaoyong;LIU Xiao;LIU Zhaohui(Key Laboratory of Structure Engineering of Jiangsu Province,SUST,Suzhou 215011,China;Suzhou City University,Suzhou 215104,China;Shenyang Key Laboratory of Intelligent Disaster Prevention and Mitigation for Civil Buildings,Shenyang University,Shenyang 110044,China)

机构地区：[1]苏州科技大学江苏省结构工程重点实验室,江苏苏州215011 [2]苏州城市学院,江苏苏州215104 [3]沈阳大学沈阳市民用建筑智慧防灾减灾重点实验室,辽宁沈阳110044

出　　处：《苏州科技大学学报(工程技术版)》2025年第1期1-8,共8页Journal of Suzhou University of Science and Technology(Engineering and Technology Edition)

基　　金：国家自然科学基金项目(52078306);江苏省高等学校自然科学研究重大项目(21KJA560002)。

摘　　要：确定了全过程中空夹层钢管混凝土构件的本构模型,利用有限元软件ABAQUS建模,对高温后中空夹层钢管混凝土偏压构件的全过程曲线进行计算,计算结果与试验结果验证良好。在此基础上,对全过程火灾后中空夹层钢管混凝土偏压构件的工作机理进行深入分析,以升温时间、空心率、内外钢管屈服强度、混凝土强度、长细比、偏心距为变化参数,建立有限元模型,考查影响全过程中空夹层钢管混凝土偏压极限承载力的因素。结果表明,材料强度和空心率对偏压短柱的剩余承载力系数影响不大,剩余承载力随材料强度增加而增加;随着偏心距的增加,构件的极限承载力显著下降,剩余承载力系数逐渐增大。随着长细比的增加,剩余承载力下降较大,长细比对偏压短柱的剩余承载力系数影响较大。随着升温时间的增长,短柱的剩余承载力系数大幅下降。The constitutive model of the concrete filled double-skin steel tubular(CFDST)after high temperature was determined,and the finite element software ABAQUS was used to model,the entire process curve of the concrete-filled double skin steel tubular after high temperature was calculated,and the results were verified well with the experimental results.On this basis,a thorough analysis is conducted on the working mechanism of the ec⁃centric compression components.A finite element model is established with temperature rise time,hollow ratio,yield strength of inner and outer steel tubes,concrete strength,slenderness ratio,and eccentricity as variable param⁃eters so as to examine the factors that affect the ultimate bearing capacity of the eccentric compression throughout the entire process.The results show that material strength and void fraction have little effect on the residual bearing capacity coefficient of eccentrically compressed short columns,and the residual bearing capacity increases with the increase of material strength;as the eccentricity increases,the ultimate bearing capacity of the component signifi⁃cantly decreases,and the residual bearing capacity coefficient gradually increases;as the slenderness ratio in⁃creases,the residual bearing capacity decreases significantly,and the slenderness ratio has a significant impact on the residual bearing capacity coefficient of eccentrically compressed short columns;as the heating time increases,the residual bearing capacity coefficient significantly decreases after the entire process of fire.

关 键 词：全过程火灾后 中空夹层高强钢管混凝土短柱 偏压力学性能 剩余承载力 

分 类 号：TU352.5[建筑科学—结构工程]