火灾下中空钢管混凝土叠合短柱力学性能  

Mechanical properties of hollow concrete-encased cFsT short column under fire

作　　者：张波 秦笑笑 任庆新 任宝森 ZHANG Bo;QIN Xiaoxiao;REN Qingxin;REN Baosen(School of Civil Engineering,Shenyang Jianzhu University,Shenyang 110168,China;Liaoning Provincial College of Communications,Shenyang 110179,China;School of Transportation,Civil Engineering and Architecture,Foshan University,Foshan 528225,China)

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]辽宁省交通高等专科学校,辽宁沈阳110122 [3]佛山科学技术学院交通与土木建筑学院,广东佛山528225

出　　处：《混凝土》2025年第2期21-25,31,共6页Concrete

基　　金：国家自然科学基金(51808351)。

摘　　要：为分析火灾下方中空钢管混凝土叠合短柱耐火性能,提出相应的耐火极限简化计算式。与已有试验数据对比验证有限元模型的正确性,分析叠合短柱在相对两面受火和轴压下的力学性能,揭示不同参数下叠合短柱的耐火性能,结果可知:荷载比(n)、截面边长(B)和空心率(χ)是影响耐火极限的主要参数。荷载比由0.4增加至0.7时,叠合短柱耐火极限降低了76.5%;截面边长由200 mm增加至800 mm时,叠合短柱耐火极限增加了61.1%;空心率由10%增加至30%时,叠合短柱耐火极限降低了45.9%。方中空钢管混凝土叠合短柱具有较好的耐火性能,是一种能够满足实际工程中耐火性能需求的钢-混凝土组合结构。To analysis the fire resistance of the square hollow concrete-encased CFST short column under fire,it provides a corresponding simplified formula for calculating the fire resistance limit.Initially,the validity of the model are verified through experimental results.Additionally,FEA results are used to analyze the mechanical performance of the short column under relativefires and axial compression.The effects of diverse parameters on the fire resistance of the members is demonstrated.The key parameters of the fire resistance limit are n,B andχ,respectively.The load ratio increases from 0.4 to 0.7,the fire resistance limit decreases by 76.5%.The section edge length increases from 200 mm to 800 mm,the fire resistance limit increases by 61.1%.The hollow ratio increases from 10%to 30%,the fire resistance limit decreases by 45.9%.The square hollow concrete-encased CFST short column has better fire resistance.It is a steel-concrete composite structure that can meet the requirements for fire resistance in practical engineering.

关 键 词：中空钢管混凝土叠合柱 轴压 相对两面受火 破坏模态 耐火性能 

分 类 号：TU528.571[建筑科学—建筑技术科学]