火灾作用下钢管混凝土叠合柱偏压力学性能研究  

Research on Mechanical Properties of Concrete Filled Steel Tube Reinforced Concrete Column Under Fire

作　　者：李永进 任庆新[2] 翁兴贵 Li Yongjin;Ren Qingxin;Weng Xinggui(College of Engineering,Fujian Jiangxia University,Fuzhou 350108,China;School of Civil Engineering,Shenyang Jianzhu University,Shenyang 110168,China;Construction&Development CO.,LTD.of China Construction Fourth Bureau Investment Branch,Xiamen 361010,China)

机构地区：[1]福建江夏学院工程学院,福建福州350108 [2]沈阳建筑大学土木工程学院,辽宁沈阳110168 [3]中建四局建设发展有限公司,福建厦门361010

出　　处：《华东交通大学学报》2022年第6期10-17,共8页Journal of East China Jiaotong University

基　　金：福建省自然科学基金项目(2018J01632);福建江夏学院科研创新团队项目(19KTXZ02)。

摘　　要：建立了钢管混凝土叠合柱有限元模型,分析了火灾作用下叠合柱的偏压力学性能,进而利用该模型,系统地分析了火灾作用下叠合柱的力学性能,并进行参数分析,讨论了截面尺寸、构件长细比和截面含钢管率等参数对承载力折减系数的影响。结果显示,在火灾作用下,叠合柱表现出较好的塑性和稳定性,构件呈明显的整体失稳破坏模态;柱的偏压力学响应可以大致分为3个阶段,柱中的各部分存在内力重分布的现象;随着受火作用进行,柱截面受拉区域逐渐发展扩大,钢管与混凝土之间的相互作用力也逐渐变大;截面尺寸和构件长细比对火灾下叠合柱承载力影响较大。To study the eccentric mechanical properties of concrete filled steel tube reinforced concrete column(CFSTRC)under fire,a finite element model is developed.The failure mode,deformation,internal force,strain and stress,interaction between steel and concrete under fire are analyzed,and the results with different parameters are discussed.The results show that under fire,the CFSTRC column shows good plasticity with overall instability failure mode,and the eccentric mechanical response of the column can be roughly divided into three stages.There is a phenomenon of internal force redistribution in each part of the column.With the tensile area of the column section gradually expanding,the interaction force between steel tube and concrete also increases gradually under fire.The section size and slenderness ratio of column have great influence on the bearing capacity of square steel tube-reinforced concrete column under fire.

关 键 词：钢管混凝土叠合柱 火灾作用 偏压力学性能 参数分析 

分 类 号：TU398[建筑科学—结构工程] U24[交通运输工程—道路与铁道工程]