预应力钢桁架在高温(火灾)下的力学特性分析  

The Mechanical Properties Analysis of the Pre-Stressed Steel Truss under the Environment of High Temperature(Fire)

作　　者：于鑫鑫[1] 张晨[1] 孙强[1] YU Xinxin;ZHANG Chen;SUN Qiang(School of Civil Engineering,Anhui Jianzhu University,Hefei,230601,China)

机构地区：[1]安徽建筑大学土木工程学院,安徽合肥230601

出　　处：《安徽建筑大学学报》2017年第1期7-10,共4页Journal of Anhui Jianzhu University

基　　金：国家重点基础研究发展计划项目(2012CB719703);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(1408085QE96)

摘　　要：高温(火灾)环境会改变预应力钢桁架力学特性,影响其安全性能。采用结构力学与火灾科学理论,对拉索式预应力钢桁架进行研究,探讨了高温(火灾)环境下不同拉索布置方式和拉索数目及杆件长度变化对预应力钢桁架力学特性的影响。研究表明:温度变化、拉索布置方式和拉索数目对预应力钢桁架力学特性产生较大影响,但杆件长度变化几乎不影响其拉索应力。研究成果对改善高温(火灾)下预应力钢桁架受力特性及对预应力钢桁架预应力体系布置等具有一定的参考价值。High temperature (fire) will change the mechanical properties of prestressed steel truss and affect its safety performance.By adopting theories of structural mechanics and fire science, gives the research on the mechanical properties of cable-prestressed steel truss and discusses the effects of different disposal and number of cables, and bar lengths that may have on the mechanical properties of cable-prestressed steel truss under high temperature (fire). The results indicate that temperature variations, disposal and number of cables will exert great influence on the mechanical properties of cable-prestressed steel truss, while the bar lengths have little impact on it. These research results have certain reference value for the improvement of the mechanical properties of prestressed steel truss under the environment of high temperature (fire) and the prestressed system layout.

关 键 词：预应力 钢桁架 高温(火灾) 拉索式 力学特性 

分 类 号：TU394[建筑科学—结构工程]