摘要
为研究钢管混凝土叠合柱在偏心荷载和相对两面火灾共同作用下的耐火性能,文中基于ABAQUS有限元软件,采用热力顺序耦合的方法,分别建立了叠合柱温度场模型和力学分析模型,并用已有试验数据进行验证。利用数值模型对钢管混凝土叠合柱在相对两面火灾作用下的温度场变化、破坏形态和内力重分布等力学性能进行分析;基于参数分析结果,给出了钢管混凝土叠合柱在相对两面受火下耐火极限的简化计算公式。研究结果表明:叠合柱在相对两面受火下达到耐火极限时,叠合柱的破坏类型为整体弯曲破坏,温度场呈双轴对称分布;荷载比、长细比、核心面积比、含钢率、外围混凝土强度和截面尺寸是影响钢管混凝土叠合柱耐火极限的主要因素。
In order to study the fire resistance of steel tube-reinforced concrete(ST-RC)columns under the combined eccentric load and two-opposite-side fire,temperature field model and mechanical analysis model of composite columns were established based on ABAQUS finite element software and thermal sequential coupling method.The finite element model was verified by the existing related experimental results.Numerical model was used to analyze the mechanical properties of ST-RC columns,such as temperature field variation,failure mode and internal force redistribution under two-opposite-side fire.Based on the results of parameters analysis,the simplified calculation formula for ST-RC columns on two sides subjected to fire is given.The results show that when ST-RC columns reach the fire resistance under two-opposite-side fire,the failure mode of ST-RC column is integral bending failure,and the temperature field is biaxial symmetric distribution.Fire load ratio,slenderness ratio,core area ratio,section steel ratio,external concrete compression strength and section size have significant effect on fire resistance of ST-RC columns.
作者
李介溶
包延红
LI Jierong;BAO Yanhong(School of Civil Engineering,Qinghai University,Xining 810016,China;Qinghai Provincial Key Laboratory of Energy-saving Building Materials and Engineering Safety,Xining 810016,China)
出处
《自然灾害学报》
CSCD
北大核心
2023年第1期150-160,共11页
Journal of Natural Disasters
基金
青海省自然科学基金青年项目(2019-ZJ-971Q)。
关键词
相对两面受火
数值模拟
钢管混凝土叠合柱
参数分析
耐火极限
two-opposite-side fire
numerical simulation
steel tube-reinforced concrete(ST-RC)column
parameter analysis
fire resistance
