建筑钢结构进展2025，Vol.27Issue(9)：73-82,10.DOI:10.13969/j.jzgjgjz.20240420001
基于节点损伤的钢管混凝土平面框架火灾下破坏机理分析
Research on Failure Mechanism of Concrete Filled Steel Tubular Planar Frame in Fire Based on Joint Damage
摘要
Abstract
The paper takes a three-story three-span circular concrete filled steel tubular(CFST)column to beam planar frame with reinforced concrete(RC)slabs and external ring connection joints as the research object,and studies the failure mechanism of this type of composite frame in fire from the view of beam-column joint damage.Firstly,a refined finite element analysis(FEA)model of the full-size three-story three-span CFST planar frame was established,and the modeling method was verified by comparing with relevant test data.Based on the principle that lower story fire was more dangerous than upper story fire,and edge column fire was more dangerous than middle column fire,a total of 12 fire scenarios were confirmed,and the failure mode,temperature,deformation development and internal force change of the composite frame in fire were analyzed.The results indicated that three types of joint damage-related failure modes,including edge column joint,middle column joint and bottom column joint failures,were observed.Finally,based on the obtained joint moment versus rotation angle curves of frame in fire,characteristic joints dominating the frame failure in fire were identified,and fire damage coefficient of joint was defined accordingly,which quantified the relationship between the joint damage degree and fire resistance of the composite frame in fire.关键词
钢管混凝土/组合框架/外环板连接节点/火灾工况/节点损伤/耐火极限Key words
concrete filled steel tube/composite frame/external ring connection joint/fire scenario/joint damage/fire resistance分类
建筑与水利引用本文复制引用
宋天诣,赵国浩,项凯..基于节点损伤的钢管混凝土平面框架火灾下破坏机理分析[J].建筑钢结构进展,2025,27(9):73-82,10.基金项目
国家消防救援局重点研发计划项目(2023XFCX17),国家自然科学基金(52178444、51778018),工业与公共建筑火灾防控技术应急管理部重点实验室开放课题(2022KLIB04) （2023XFCX17）
