升—降温全过程中约束钢梁的有限元与试验分析  

Finite Element and Experimental Analyses of a Restrained Steel Beam in Complete Process of Heating and Cooling

作　　者：孙冬明[1] 夏军武[1] 常鸿飞[1] 卜令全[1] 

机构地区：[1]中国矿业大学建筑工程学院,江苏徐州221116

出　　处：《防灾减灾工程学报》2010年第1期71-76,共6页Journal of Disaster Prevention and Mitigation Engineering

摘　　要：以轴向支撑连接方式,利用自制的加热炉对约束钢梁进行了升—降温全过程的试验研究。重点研究了钢梁的跨中挠度随温度变化的规律,以及梁端不同轴向支撑刚度和钢柱不同轴压比条件下约束钢梁的屈曲模式及其梁端轴向支撑的破坏形态。基于ANSYS有限元软件,采用温度场和结构耦合中的间接法,对升-降温全过程中的约束钢梁进行了有限元分析。数值计算结果与试验结果吻合较好,验证了有限元模型和参数设置的合理性。根据对比分析,讨论了我国现行钢结构防火技术规范中存在的关键问题,特别提出了钢结构抗火设计应有的内涵,为钢结构抗火研究提供了新的思路。An axially restrained steel beam in a complete process of heating and cooling was physically tested and numerically simulated.The heating device was made in-house by the authors.The study has been emphasized on the regularity of mid-span deflection of the beam under different temperature,the buckling modes of the beam and the failure pattern of the axial support at the beam end in cases of different axial supporting stiffness and of different axial compressive ratio of the steel column.The numerical simulation of the beam was carried out with the finite element software package ANSYS using an indirect method for coupling the mechanical response with the thermal field.The numerical results agree well with the testing ones,which validates the finite element model and its parameter values.Some key problems in Chinese code for the fire safety of steel beams are discussed through comparative analyses,especially the connotation of the fire-resistant design of steel structures,to provide an alternative approach for the study of fire-resistant steel structures.

关 键 词：约束钢梁 升—降温全过程 抗火设计内涵 加热炉 

分 类 号：TU391[建筑科学—结构工程] TU317.1