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为研究预应力轴心受拉钢构件的抗火性能,利用传热学原理对火灾下预应力轴心受拉钢构件的温度分布进行了理论分析,得出了任意爆火时刻预应力索温度的差分计算式。分析表明:火灾下拉索升温随拉索的等效直径增加而降低,随预应力钢管的温度升高而升高。利用索温度的差分计算式以及抗火设计基本思路,推导出预应力轴心受拉钢构件临界温度的简化计算方法,并采用试验研究、有限元方法对计算方法进行了验证。该计算方法表明构件的临界温度随着约束刚度比的增加而升高,随着荷载比的增加而降低。
In order to study the fire resistance of prestressed axial tensioned steel members, the temperature distribution of the prestressed axial prestressed steel members under fire was theoretically analyzed by the principle of heat transfer, and the temperature of pre- Differential calculation formula. The analysis shows that the heating cable temperature decreases with the increase of cable equivalent diameter and increases with the temperature of prestressed steel pipe. Based on the difference calculation of cable temperature and the basic idea of fire resistance design, a simplified calculation method of the critical temperature of prestressed axially tensioned steel components is deduced. The experimental study and the finite element method are used to verify the calculation method. The calculation method shows that the critical temperature of the component increases with the increase of the restraining stiffness ratio, and decreases with the increase of the load ratio.