轴心受压SRC柱受火全过程数值分析

Numerical analysis of centrally compressed SRC columns exposed to stand fire including heating and cooling

在确定升、降温段钢材和混凝土材料性能的基础上,利用通用有限元软件ANSYS对轴心受压型钢混凝土柱受火全过程进行计算分析。结果表明截面温度滞后现象比较明显,在降温后的较长时间内构件内部仍在升温,SRC柱性能进一步劣化,其抗火能力最不利阶段发生在火灾降温过程中。

Based on the definition of the thermal and mechanical properties of steel and concrete both in temperature rise period and temperature drop period, the reaction of steel reinforced concrete （SRC） columns during the whole period of stand fire was simulated by ANSYS. The calculated results showed that the temperature of the inner cross section increases slowly compared with hot air in temperature rise period, and it still increases during some time in temperature drop period. The fire resistance capacity of SRC columns further decreases and it is more dangerous in temperature drop period.