热力耦合作用下H型截面钢框架力学特征研究  

Research on the Mechanical Characteristics of H-section Steel Frames Subjected to Thermal Coupling

作　　者：李雨城 王伟 王兴[1] LI Yucheng;WANG Wei;WANG Xing(School of Mechanical Engineering,Anhui Sanlian University,Hefei Anhui 230601,China)

机构地区：[1]安徽三联学院机械工程学院,安徽合肥230601

出　　处：《盐城工学院学报（自然科学版）》2020年第4期45-49,共5页Journal of Yancheng Institute of Technology:Natural Science Edition

基　　金：安徽高校省级自然科学研究重大项目(KJ2014ZD06);安徽省高校学科拔尖人才学术资助项目(gxbjZD56)。

摘　　要：高温火灾环境下钢框架力学特征的研究是目前研究的热点之一。采用理论计算与有限元模拟相结合的方法对单层单跨与两层两跨的H型截面钢框架承载力进行了深入的探讨,得出如下结论:热力耦合作用下的单层单跨H型截面钢框架的整体弯矩随着温度的升高而减小,其承载力的理论计算与数值模拟结果基本一致。热力耦合作用下的两层两跨H型截面钢框架随着温度升高,梁左右两端弯矩均呈现先增大后减小,但左右两端弯矩变化方向相反;而梁跨中弯矩基本保持不变。两层两跨H型截面钢框架随着温度升高,边柱弯矩比中柱变化幅度大。The research on the mechanical characteristics of steel frame under high temperature fire is one of the hot topics.In this paper,the bearing capacity of H-section steel frames with single-story single-span and two-story two-span H-section is discussed by combining theoretical calculation and finite element simulation.The following conclusions are drawn:The overall bending moment of the single-story single-span H-section steel frame under thermal and mechanical coupling decreases with the increase of temperature,and the theoretical calculation of its bearing capacity is basically consistent with the numerical simulation results.Under the action of thermal coupling,the bending moments of the two-story and two-span H-section steel frame at both ends of the beam first increased and then decreased with the increase of temperature,but the bending moments at both ends changed in opposite directions.The bending moment in the middle of the beam is basically unchanged.As the temperature rises in the two-story,two-span H-section steel frame,the bending moment of the side columns changes more than the center column.

关 键 词：热力耦合 钢框架 承载性能 有限元模拟 

分 类 号：TU352[建筑科学—结构工程]