摘要
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。
To study fire resistance of prestressed tensile steel members, theoretical analysis of prestressed tensile steel members at high temperature were carried out on the basis of the principles of heat transfer, and the incremental formulas of cable temperatures were obtained. The results show that the temperature of the cable decreases with the temperature of the steel pipe and increases with equivalent diameter. Simplified method for calculating the critical temperature of prestressed tensile steel member was verified by experimental study and the finite element method was deduced. The calculations show that the critical temperature decreases with the load ratio and increases with the restraint stiffness ratio.
出处
《防灾减灾工程学报》
CSCD
北大核心
2016年第3期350-356,共7页
Journal of Disaster Prevention and Mitigation Engineering
基金
国家自然科学基金项目(51278394)资助
关键词
预应力
轴心受拉钢构件
抗火性能
设计方法
prestress
axial steel tension members
fire resistance
design method
