火灾后设置加劲钢筋的十字形薄壁钢管混凝土短柱轴压机理  

Axial compression mechanism of cross-shaped thin-walled concrete-filled steel tube(CFST)short columns with stiffened steel bars after fire

作　　者：王微微 刘鑫 郑君 张琳 吕学涛 WANG Weiwei;LIU Xin;ZHENG Jun;ZHANG Lin;LV Xuetao(School of Architectural Engineering,Guangzhou Vocational University of Science and Technology,Guangzhou 510550,China;School of Civil Engineering and Transportation,Foshan University,Foshan 528225,China)

机构地区：[1]广州科技职业技术大学建筑工程学院,广东广州510550 [2]佛山大学土木与交通学院,广东佛山528225

出　　处：《佛山科学技术学院学报(自然科学版)》2025年第1期62-69,共8页Journal of Foshan University(Natural Science Edition)

基　　金：国家自然科学青年基金项目(51208246);广东省教育厅普通高校特色创新项目(2023KTSCX218);广东省教育厅普通高校创新团队项目(2024KCXTD068)。

摘　　要：利用ABAQUS软件,建立了火灾后设置加劲钢筋的十字形薄壁钢管混凝土短柱的有限元分析模型,在验证模型有效性的基础上,研究了钢管和核心混凝土协同作用机理、钢管对核心混凝土法向接触力分布规律、核心混凝土的纵向应力分布规律。研究结果表明,火灾后钢管混凝土短柱受压过程分为弹性阶段、弹塑性阶段、强化阶段或下降阶段;钢管承担的荷载比例随受火时间延长而增大;钢管与混凝土之间的相互作用随升温时间、宽厚比和加劲钢筋间距的增加而减小。In this paper,ABAQUS is used to establish the finite element model of cross-shaped thin-walled concrete-filled steel tube after fire.On the basis of model verification,the synergistic mechanism of steel tube and core concrete,the distribution law of normal contact force between steel tube and core concrete,and the distribution law of longitudinal stress of core concrete are studied.It can be seen that the compression process of the short column was divided into elastic stage,elastoplastic stage,hardening stage or softening stage.The proportion of load borne by steel tube increased with heating time.The interaction between steel tube and concrete decreased with the increase of heating time,width-thickness ratio and steel bar’s spacing.

关 键 词：火灾后 十字形截面 薄壁钢管混凝土 加劲钢筋 轴压机理 

分 类 号：TU398[建筑科学—结构工程]