高温环境下预应力钢桁架的热力耦合分析  

THERMO-MECHANICAL COUPLING ANALYSIS OF PRESTRESSED STEEL TRUSS AT HIGH TEMPERATURES

作　　者：吴明涵 刘冬骏 孙强 

机构地区：[1]安徽建筑大学土木工程学院,合肥230601

出　　处：《钢结构》2018年第2期110-113,共4页Steel Construction

基　　金：安徽高校省级自然科学研究重大项目(KJ2014ZD06);安徽省自然科学基金项目(1408085QE96)

摘　　要：采用有限元方法,对预应力钢桁架在大空间建筑火灾的温度场分布和热力耦合作用下各个时间段的位移与应力进行研究,分析预应力钢桁架在高温(火灾)条件下的抗火性能,并将预应力拉索损失与理论计算结果进行对比分析。研究表明:大空间温度的上升对钢桁架的力学特性产生较大影响,拉索的预应力损失较小。Based on the finite element method,the displacement and stress of the prestressed steel truss under the combined action of temperature field distribution and the thermo-mechanical coupling in the large space building fire were studied. The fire resistance of the prestressed steel truss at high temperatures（ fire） was analyzed,and the loss stress of prestressed cables were compared with the theoretical results. The results showed that the increase of temperature of large space had a great influence on the mechanical properties of steel trusses,and the loss stress of prestressed cables was smaller.

关 键 词：预应力钢桁架 热力耦合 大空间建筑火灾 预应力损失 

分 类 号：TU394[建筑科学—结构工程]