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)

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.