摘要
针对混凝土结构在火灾环境下温度场及热应力分布规律数值模拟分析中的热工参数合理选取问题,采用ISO-834标准升温曲线对预埋有K型铠装热电偶传感器混凝土梁进行单面明火试验,探明了混凝土梁在标准火灾环境下温度场的分布规律;基于欧洲规范中导热系数上限值,采用数值模拟手段再现了单面明火试验全过程,依据试验结果反演修正了欧洲规范导热系数上限值计算公式。结果表明:室内火烧试验炉内实际升温曲线与ISO-834标准升温曲线非常接近,说明试验模拟的火灾场景符合实际的火灾情况;采用欧洲规范的热工参数进行温度场模拟时,不同断面处的温度与试验值存在较大温度差,且模拟值均高于试验值;基于优化后的导热系数上限值计算公式,在距受火面10、20 mm处的数值模拟温度值与试验值的温差分别减小至4.43℃与2.21℃,验证了优化公式的合理性。
Aiming at the problem of reasonable selection of thermal parameters in numerical simulation analysis of temperature field and thermal stress distribution of concrete structure under fire environment,the single-side open fire test of concrete beam embedded with K-type armored thermocouple sensor was carried out by ISO-834 standard heating curve,and the distribution law of temperature field of concrete beam under standard fire environment was proved.Based on the upper limit of thermal conductivity in European specification,the whole process of one-sided open fire test was reproduced by numerical simulation,and the calculation formula of the upper limit of thermal conductivity in European specification was inversed and corrected according to the test results.The results show that:the actual heating curve in the indoor fire test furnace is very close to the ISO-834 standard heating curve,indicating that the simulated fire scene is in line with the actual fire situation.When the thermal parameters of European specification are used to simulate the temperature field,there is a large temperature difference between the temperature at different sections and the test value,and the simulation values are higher than the test values.Based on the optimized upper limit calculation formula of thermal conductivity,the temperature difference between the numerical simulation temperature value and the experimental value at 10 mm and 20 mm away from the fire surface is reduced to 4.43℃and 2.21℃,respectively,which verifies the rationality of the optimized formula.
作者
雷中成
李化云
陈晔磊
付钧福
邓来
LEI Zhong-cheng;LI Hua-yun;CHEN Ye-lei;FU Jun-fu;DENG Lai(School of Civil Engineering,Architecture and Environment,Xihua University,Chengdu 610039,China)
出处
《广西大学学报（自然科学版）》
CAS
北大核心
2022年第3期588-597,共10页
Journal of Guangxi University（Natural Science Edition）
基金
国家自然科学基金项目(51608450)。
关键词
标准火烧实验
单面受火
温度场
导热系数
数值模拟
参数优化
standard fire test
one-side fire
temperature field
thermal conductivity
numerical simulation
parameter optimization
作者简介
通讯作者:李化云(1982-),男,浙江淳安人,西华大学副教授,博士,E-mail:210101good@163.com。
