预应力钢柱在火灾环境下的预应力损失分析

Analysis of the Prestress Loss of Prestressed Steel Column in the Fire

通过对预应力钢柱的热力耦合分析,得出钢柱在火灾条件下的预应力损失情况,并将预应力损失软件模拟结果与理论计算结果进行对比分析.结果表明:在整体发生火灾的情况下,预应力钢柱不同位置温度会呈现不同的分布情况,且随着火灾时间的持续与温度的升高,钢柱拉索中预应力不断发生损失,在400℃之前,预应力损失增长速率较低,当温度到达400℃之后,预应力损失增长迅速.研究结论为钢结构防火研究分析提供借鉴和参考.

Through the coupled thermo-mechanical analysis of the prestressed steel pillar,we can calculate the prestress loss of the steel column in the fire,and comparatively analyze the software simulation results with the theoretical calculation results.Research shows that： in the case of a fire,prestressed steel column temperature can present different distribution,and with the rise of temperature,prestress loss of the steel cable occurs continuously,growth rate of the prestress loss is low before 400℃; while when the temperature reaches 400℃,the loss of prestress is growing rapidly.The conclusion can be used as a reference for the research and analysis of steel structure fire protection.