摘要
联合应用恒载升温热-力路径下所得ε-T-k材料模型与恒温加载热-力路径下所得ε-k-T材料模型,构建了一种与受火钢构件实际热-力路径相符的分段叠加计算模型,并将计算结果与试验结果进行对比分析。结果表明:所采用分段叠加法突破了传统的恒温加载试验和恒载升温试验钢构件热-力路径,计算所得结果与试验结果相近,作为计算分析钢构件温度应力的一种方法,可有效提高钢结构抗火设计与评估的准确性。
A section superposition model was educed from the T-k material model obtained by transient tests stress-tem- perature path and ε-κ- T material model obtained by steady state tests stress-temperature path, which can match the actual stress-temperature path of the steel members under fire. The calculating results were compared with tests. It showed that： This model exceeds the stress-temperature paths of transient tesbs and steady state tests, the calculating result is closed to the test result. Being a material model to evaluate the thermal stress of steel element, it could improve the accuracy of steel structure fire resistance design and evaluation effectively.
出处
《消防科学与技术》
CAS
北大核心
2015年第1期8-10,共3页
Fire Science and Technology
基金
公安部应用创新计划项目(2008YYCXWJXY117)
灭火救援技术公安部重点实验室基金项目
关键词
轴心受压约束钢柱
热-力路径
温度应力
分段叠加法
axial compressed steel columns with restrained ther-mal elongation
stress-temperature path
thermal stress~ sec-tion superposition method
