预应力组合网架结构抗火性能数值分析
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摘要
为了考察预应力组合网架结构在火灾下的力学性能和影响因素,结合实际工程对预应力组合网架结构的抗火性能进行了数值分析.介绍了采用的破坏准则、基本假定及有限元模型,考虑了边界条件、拉索布置、涂层厚度及节点刚度对其整体抗火性能的影响.通过分析,发现预应力组合网架具有良好的抗火性能;边界法向约束条件对于结构耐火时间具有显著影响;采用预应力索从下弦杆中穿过的方案,使得拉索受到了下弦杆的保护,延缓了升温速度;为达到规范规定的耐火时间,所需的防火保护层厚度低于规范规定的要求;模型中采用刚接或铰接节点,计算得到的耐火时间基本相同.
In order to reveal the mechanical performance and influencing factors of pre-stressed composite space truss under the fire condition,the fire resistance of pre-stressed composite space truss was studied by numerical analysis with a practical project.The destruction rules,the basic assumptions and the finite element models which are used in the analysis were introduced.The influences of the border support condition,the position of the cable,the thickness of the fire-resistant paint and the joint rigidity on the fire resistance of the pre-stressed composite space truss were considered.Numerical results showed that pre-stressed composite space truss had good performance of fire-resistance.The normal support condition greatly influenced its fire resistant perfor-mance.When the pre-stressed cable was laid through the bottom chord,the cable was protected by the tube,and then its temperature rise rate was reduced.In order to satisfy the fire-resistant time in the currently valid stan-dard,the thickness of the paint was thinner than specified thickness in the standard.The analysis results of the models using hinged nodes or rigid nodes were basically the same.
In order to reveal the mechanical performance and influencing factors of pre-stressed composite space truss under the fire condition,the fire resistance of pre-stressed composite space truss was studied by numerical analysis with a practical project.The destruction rules,the basic assumptions and the finite element models which are used in the analysis were introduced.The influences of the border support condition,the position of the cable,the thickness of the fire-resistant paint and the joint rigidity on the fire resistance of the pre-stressed composite space truss were considered.Numerical results showed that pre-stressed composite space truss had good performance of fire-resistance.The normal support condition greatly influenced its fire resistant perfor-mance.When the pre-stressed cable was laid through the bottom chord,the cable was protected by the tube,and then its temperature rise rate was reduced.In order to satisfy the fire-resistant time in the currently valid stan-dard,the thickness of the paint was thinner than specified thickness in the standard.The analysis results of the models using hinged nodes or rigid nodes were basically the same.
引文
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[11]ENV1993-1-2,Eurocode3,Design of Steel Structures,Part1.2:Structural Fire Design[S].1993.
[12]ENV1994-1-2,Eurocode3,Design of Composite and Con-crete Structures,Part 1.2:Structural Fire Design[S].1994.
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[2]裴波.预应力组合网架结构的理论分析及实验研究[D].天津:天津大学建筑工程学院,2003.Pei Bo.Theoretical Analysis and Experimental Study of Pre-Stressed Composite Space Truss[D].Tianjin:School ofCivil Engineering,Tianjin University,2003(in Chinese).
[3]英明.斜放四角锥预应力组合网架结构的数值分析、实验研究及软件开发[D].天津:天津大学建筑工程学院,2004.Ying Ming.Numerical Analysis,Experimental Study andSoftware Development of Pre-stressed Diagonal-on-SquarePyramid Composite Space Truss[D].Tianjin:School ofCivil Engineering,Tianjin University,2004(in Chinese).
[4]韩庆华,裴波,杨志,等.预应力组合网架结构的理论分析与应用研究[J].建筑结构学报,2004,25(1):87-92.Han Qinghua,Pei Bo,Yang Zhi,et al.Theoretical analysisand application study on pre-stressed steel-concrete compo-site grid structures[J].Journal of Building Structures,2004,25(1):87-92(in Chinese).
[5]韩庆华,裴波,王成博,等.预应力组合网架结构的自振特性及现场测试[J].地震工程与工程振动,2004,24(2):118-124.Han Qinghua,Pei Bo,Wang Chengbo,et al.Analysis ofnatural vibration characteristics and testing on constructionsite of pre-stressed composite space truss[J].EarthquakeEngineering and Engineering Vibration,2004,24(2):118-124(in Chinese).
[6]Han Q H,Yuan Z H,Ying M,et al.Numerical analysisand experimental study of pre-stressed diagonal-on-squarecomposite space truss[J].Advances in Structure Enginee-ring,2005,8(4):397-410
[7]李国强,蒋首超,林桂祥.钢结构抗火设计与计算[M].北京:中国建筑工业出版社,2000.Li Guoqiang,Jiang Shouchao,Lin Guixiang.Calculationand Design ofFire Resistance ofSteel Structure[M].Bei-jing:China Architectural Industry Press,2000(in Chi-nese).
[8]陆洲导,李刚,许立新.无粘结预应力混凝土框架结构抗火性能比较研究[J].土木工程学报,2003,36(10):30-35.Lu Zhoudao,Li Gang,Xu Lixin.Analysis for structure re-sponses of unbonded pre-stressed reinforced concrete framesin fire environments[J].China Civil Engineering Journal,2003,36(10):30-35(in Chinese).
[9]蒋首超,李国强,周宏宇,等.钢-混凝土组合楼盖抗火性能的实验研究[J].建筑结构学报,2004,25(3):45-50.Jiang Shouchao,Li Guoqiang,Zhou Hongyu,et al.Expe-rimental study of behavior of steel-concrete composite slabssubjected to fire[J].Journal ofBuilding Structures,2004,25(3):45-50(in Chinese).
[10]蒋首超,李国强,楼国彪,等.钢-混凝土组合楼盖抗火性能的数值分析法[J].建筑结构学报,2004,25(3):38-44.Jiang Shouchao,Li Guoqiang,Lou Guobiao,et al.Numeri-cal approach of behavior of steel-concrete composite slabssubjected to fire[J].Journal ofBuilding Structures,2004,25(3):38-44(in Chinese).
[11]ENV1993-1-2,Eurocode3,Design of Steel Structures,Part1.2:Structural Fire Design[S].1993.
[12]ENV1994-1-2,Eurocode3,Design of Composite and Con-crete Structures,Part 1.2:Structural Fire Design[S].1994.
[13]丁军,李国强.火灾下钢结构楼板的薄膜作用[J].建筑钢结构进展,2005,5(2):17-23.Ding Jun,Li Guoqiang.Membrane action in floor slabs ofsteel structures subjected to fire[J].Progress in SteelBuilding Structures,2005,5(2):17-23(in Chinese).
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