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首页> 外文会议>The 2008 International Symposium on Safety Science and Technology(2008年安全科学技术国际会议)论文集 >3-D Finite Element Analysis of Response Behaviors of Steel Staggered-Truss Framing System at Local Elevated Temperatures
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3-D Finite Element Analysis of Response Behaviors of Steel Staggered-Truss Framing System at Local Elevated Temperatures

机译：局部高温下钢交错桁架结构响应特性的三维有限元分析

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摘要

The lack of proper fire safety design theory is one of the most important factors to restrict the application and popularization of stnel staggered-truss framing system (SSTFS). In this paper, in order to study the fi re-resistant properties of SSTFS, based on thr~-dimensional (3-D) structure model, the structural response behaviors of this form at elevated temperatures were studied by using the finite element method. The relationship of axial force and bending moment against temperature were explored, and the reasons for these changes were analyzed. Based on these studies, the fire-resistant cdtical temperature at elastic limit was obtained, and some influence factors of the fire-resistant properties of SSTFS were discussed. The results indicate that: under fire conditions, the internal force redistribution of the columns and trusses in fire-exposed regions are serious, while the other columns and trusses are inconspicuous, the influences of fire on the whole structure are constrained in local areas. The effect of the section dimension on the fire-resistant ability of SSTFS is obvious, in the case of only the truss exposing to fire, increasing chord section dimension improves the fire-resistant critical temperature, but the external columns oppositely. The strength of member has a certain impact on the fire resistance capacity of SSTFS. Improving the material strength of the component has some help for the fire-resistant performance of the whole structure, but the effect is not significant.
机译：缺乏适当的消防安全设计理论是制约Stnel交错桁架结构系统（SSTFS）的应用和普及的最重要因素之一。为了研究SSTFS的耐火性能，基于三维（3-D）结构模型，采用有限元方法研究了这种形式在高温下的结构响应行为。探讨了轴向力和弯矩与温度的关系，并分析了这些变化的原因。在此基础上，得出了弹性极限温度，并讨论了影响SSTFS耐火性能的一些因素。结果表明：在着火条件下，受火区域柱和桁架的内力重分布严重，而其他柱和桁架的引力不明显，局部区域着火对整个结构的影响受到限制。截面尺寸对SSTFS耐火性能的影响是显而易见的，仅在桁架暴露于火的情况下，增大弦截面尺寸可以提高耐火极限温度，而外柱则相反。构件的强度对SSTFS的耐火能力有一定的影响。提高构件的材料强度对整个结构的耐火性能有一定的帮助，但效果并不显着。

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