建筑结构学报2013，Vol.34Issue(8)：46-55,10.
预应力钢桁架火灾响应及火灾后受力性能试验研究
Experimental research on fire response and post-fire performance of prestressed steel truss structures
摘要
Abstract
The experimental study of fire behavior and post-fire performance of four spatial prestressed steel truss models was conducted and presented.The Austenite 304 seamless stainless steel tubes was selected and used for making the bars of truss of the structure model,and the steel strand 7 × 12 + IWR which has higher strength was used as the cable for application of pre-stresses.A short rotatable steel column which can be elongated and retracted was set at the center of the truss right below the bottom chord of the truss to apply prestressing force.The structure model was simply supported at the two shorter sides,and the other two sides of the structure model were free.The response temperatures of the chords and web bars of the truss of the model and typical displacements of the upper nodes of the truss were measured.The unloading and loading experiments were further conducted for the structure model which is not out of work after exposure to fire.The results show that the whole collapse of the structure models does not take place while there is certain cable relaxation.There is certain residual displacement for the structure model after exposure to fire,and the value of residual displacement of the two tension model is less than that of the one tension model for the stainless prestressed steel trusses with the same geometrical dimension and fire conditions.It is concluded that the number of times of applying pretension to the model and the maximum furnace temperature have no effect on the elastic ultimate load applied to the post-fire structure model which has large stiffness.关键词
预应力钢桁架/不锈钢模型/抗火试验/火灾后性能Key words
prestressed steel truss/ stainless steel model/ fire-resistant experiment/ post-fire performance分类
建筑与水利引用本文复制引用
王新堂,孙宏亮,杜引刚,王万祯..预应力钢桁架火灾响应及火灾后受力性能试验研究[J].建筑结构学报,2013,34(8):46-55,10.基金项目
国家自然科学基金项目(51078187,51278254),浙江省公益技术应用研究项目(2012C23036). （51078187,51278254）
