局部火灾条件下H型钢梁温度分布试验及模拟  

Experiment and Simulation of Temperature Distribution for H-shape Beams under Local Fire Condition

作　　者：缠东辉[1,2] 陈玲[1,2] 张卓[3] 

机构地区：[1]天津理工大学天津市复杂系统控制理论及应用重点实验室,天津300384 [2]天津理工大学机械工程学院,天津300384 [3]天津城市建设学院土木工程系,天津300384

出　　处：《机械工程材料》2013年第6期98-101,共4页Materials For Mechanical Engineering

基　　金：天津市自然科学基金资助项目(023607211)

摘　　要：在小空间室内对H型钢梁进行了局部火灾试验,热源温度为880℃,采集沿H型钢梁高度方向的温度分布,并与压型钢板-混凝土组合梁在局部火灾下的试验数据进行比较;在试验基础上采用有限元软件ANSYS数值模拟反推所需的各种热物理参数,并模拟出工程中常用的几种窄翼缘H型钢在小空间室内火灾条件下的温度场。结果表明:火灾持续30min后H型钢达到很高的温度,且钢梁各个部分的温度分布差异很大,下翼缘的最高温度达到630℃,而上翼缘只有300℃;H型钢梁的温度梯度从下向上逐渐增大,温度随时间的变化呈非线性分布;试验结果证明了模拟的准确性。H shape steel beams were examined under local fire condition in a small space where the heat source temperature was 880 ℃, the temperature distribution of the H-shape steel beams along the height direction was collected and compared with the experimental data from profiled steel sheet-heron built up beams under local fire condition. Temperature fields of several thin wing H-shape steel beams normally used in engineering were simulated under local fire condition in a small space, using thermal physical parameters deduced from numerical simulation by finite element software ANSYS and based on the experimental data. Results show that H shape steel got a high temperature in a fire for 30 min, and the temperature distribution show great difference in each part of the beam, the highest temperature of the bottom flange was 630 ℃ while it was only 300 ℃ of the top flange. The temperature gradient of H shape steels increased gradually from the bottom to the top, the temperature-time curves were nonlinear. The experiment results proved the accuracy of the simulation.

关 键 词：火灾试验 H型钢 温度 模拟 

分 类 号：TU391[建筑科学—结构工程]