高温下超静定钢结构受力情况分析

MECHANICAL ANALYSIS OF HYPERSTATIC STEEL STRUCTURE IN HIGH TEMPERATURE

采用FDS火灾动态模拟软件建立钢结构厂房火灾场景,并运用ANSYS有限元分析软件进行结构受力分析。研究表明:在高温作用情况下,超静定钢结构工程由于内力重分布会导致构件内力发生较大的变化,可能与常温下的受力设计不一致,进而造成结构失稳。由此提出,对钢结构在高温作用下的安全分析,应当进行基本钢结构单元的抗火承载力验算,而不能仅因为温度远未达到失去静态平衡稳定性的临界温度(540℃左右)就认为结构是安全的。

Use the software FDS to establish steel plant fire scene, and structural stress analysis is done by ANSYS. Then conclusion shows that the internal forces of hyperstatic steel structure will large change at high temperature because of internal forces redistribution,which differents from the force design at room temperature and causes buckling. The steel＇s safety analysis at high temperature should be to check the fire-resistant capacity of the basic steel structure unit. Even less than 540℃ which far below the critical temperature stability of loss of static balance , it may not be safey enough.