钢框架结构火灾下抗震性能损伤研究  

Research on the Seismic Damage of Steel Frame Structure Under Fire

作　　者：李宁[1] 刘纪陆[1,2] 赵崛 LI Ning;LIU Jilu;ZHAO Jue(Department of Civil and Environment Engineering,Shantou University,Shantou 515063,China;Guangdong Structural Safety and Monitoring Engineering Technology Research Center,Shantou 515063,China)

机构地区：[1]汕头大学土木与环境工程系,广东汕头515063 [2]广东省结构安全与监测工程技术研究中心,广东汕头515063

出　　处：《建筑钢结构进展》2022年第11期72-81,共10页Progress in Steel Building Structures

基　　金：国家自然科学基金(50478119);广东省自然科学基金(S2011010005192)。

摘　　要：为评估钢框架结构在火灾下抗震性能的损伤程度,提出基于钢材力学性能折减和基准刚度法的钢框架结构火灾损伤评估方法。对火灾不同温度工况下的钢框架构件进行损伤敏感度分析,研究不同温度工况与钢框架梁、柱的损伤关系;在不同楼层火灾下识别损伤结构模态参数,以损伤前的楼层层间刚度为基准,揭示钢框架结构不同楼层、梁柱构件、中跨和边跨火灾损伤对楼层损伤的影响规律;最终获得楼层损伤与整体结构损伤的关系,建立钢框架结构火灾下抗震性能损伤演化模型。研究成果可为建立不同温度工况下钢框架结构抗震性能的损伤模型提供理论基础,以及对钢框架结构火灾下预期抗震性能作出有效评估。In order to evaluate the seismic performance of steel frame structure under fire,a fire damage assessment method of steel frame structure based on a degraded mechanical property of steel and the reference stiffness method is proposed.In this paper,the damage sensitivity of steel frame members is analyzed under different temperatures of fire,and the relationship is studied between different temperature conditions and the damage of steel frame beams and columns.Also the modal parameters of damaged structure are identified under different floor fires,and the inter-story stiffness of floors before damage is used as a benchmark to reveal the influence law of fire damage on floor damage for different floors,beam and column members,mid-span and side spans of steel frame structures. Finally,the relationship between floor damage and overall structural damage is obtained,and a model of seismic damage evolution of steel frame structure under fire is established. The research results can provide a theoretical reference for building a damage model for the seismic performance of steel frame structures under different temperature conditions and make an effective assessment of the expected seismic performance of the structures under fire.

关 键 词：钢框架结构 火灾场景 抗震性能 损伤模型 损伤表征 

分 类 号：TU391[建筑科学—结构工程]