3-D Finite Element Analysis of Response Behaviors of Steel Staggered-Truss Framing System at Local Elevated Temperatures
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.
staggered-truss fire-resistant performance steel structure critical temperature 3-D structure model
CHEN Changkun XIAO Rong ZHANG Dong
Institute of Disaster Prevention Science & Safety Technology,Central South University,Changsha 41007 Institute of Disaster Prevention Science & Safety Technology,Central South University,Changsha 41007
国际会议
The 2008 International Symposium on Safety Science and Technology(2008年安全科学技术国际会议)
北京
英文
769-773
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）