全过程火灾后中空夹层高强钢管混凝土短柱轴压力学性能研究  

Axial compressive performance of concrete filled double-skin high-strength steel tubular short columns after whole process fire

作　　者：付韩斌 毛小勇[1,2] 刘晓 贺海洋[3] FU Hanbin;MAO Xiaoyong;LIUXiao;HE Haiyang(Jiangsu Key Labatoary of Structure Engineering,SUST,Suzhou 215011,China;Suzhou City University,Su-zhou 215104,China;Shenyang Key Laboratory of Intelligent Disaster Prevention and Mitigation for Civil Build-ings,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）》2024年第4期25-30,共6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：为研究升降温全过程火灾后中空夹层高强钢管混凝土短柱的抗火性能,在确定不同阶段高强钢材和约束混凝土的本构模型的前提下,利用ABAQUS有限元软件,建立了中空夹层高强钢管混凝土短柱的温度场模型和热力学分析模型,并利用已有的试验数据对模型进行了验证。分析了升温时间、空心率、材料强度和轴压比等参数对短柱全过程火灾后剩余承载力的影响。结果表明,随着升温时间的增长,全过程火灾后中空夹层高强钢管混凝土短柱的剩余承载力大幅下降;随着空心率增加,短柱的剩余承载力系数先增加后减小,其空心率为0.52的短柱抗火性能最优;材料强度和轴压比对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。In order to study the fire resistance of concrete filled double-skin high-strength steel tubular short columns(CFDST)after fire in the whole process of rising and cooling,the temperature field model and thermodynamic analysis model of concrete filled double-skin high-strength steel tubular short columns were established by using the finite element software ABAQUS after determining the constitutive models of the high strength steel and constrained concrete at different stages.And the model is verified by the existing experimental data.The effects of heating time,hollow rate,material strength and axial compression ratio on the residual bearing capacity of short columns were analyzed.The results show that with the increase of heating time,the residual bearing capacity of concrete filled double-skin high-strength steel tubular short columns decreases significantly after the whole process fire;With the increase of hollow ratio,the residual bearing capacity coefficient of short columns first increases and then decreases,and the short column with hollow ratio of 0.52 has the best fire resistance;Material strength and axial compression ratio have little effect on the residual bearing capacity coefficient of short columns,and the residual bearing capacity increases with the increase of material strength.

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

分 类 号：TU528.34[建筑科学—建筑技术科学]