K8型单层球面网壳的性能化防火研究
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摘要
以凯威特K8型单层球面网壳为研究对象,选用高大空间火灾空气温升曲线模拟3种火灾场景下结构的非均匀温度场,利用有限元软件ANSYS对结构进行火灾全过程分析,得出结构在火灾作用下的位移特征、内力变化、极限荷载和失稳模态,阐明不同结构参数(荷载比、矢跨比、跨度)对耐火时间和极限位移的影响。根据结构在火灾高温下的最不利情况和破坏形式,结合双层球面网壳的抗火优势,采用性能化防火设计方法,得到单层球面网壳结构防火改进的一般规律,达到延长结构的耐火时间,提高结构在火灾高温下弹塑性极限承载力的目的。
A full-range analysis of K8 single-layer spherical latticed dome was carried out by ANSYS at elevated temperature obtained through taking temperature-rising curve in the large space fire to simulate non-uniform temperature field of three fire situations. The displacement characteristic, stress change, ultimate load and buckling mode of the structure in the fire were obtained, clarifying the influence of different structural parameters(load ratios,rise-span ratio, span) on the fire-resistant time and ultimate displacement. According to the most unfavorable situation and the damage form of the structure under the fire, combined with the fire resistance of double-layer spherical latticed dome, the general fire resistance improvement rule of single layer spherical latticed dome is obtained by the performance-based fire safety design to improve the fire-resisting period and elasto-plastic stability under the fire.
A full-range analysis of K8 single-layer spherical latticed dome was carried out by ANSYS at elevated temperature obtained through taking temperature-rising curve in the large space fire to simulate non-uniform temperature field of three fire situations. The displacement characteristic, stress change, ultimate load and buckling mode of the structure in the fire were obtained, clarifying the influence of different structural parameters(load ratios,rise-span ratio, span) on the fire-resistant time and ultimate displacement. According to the most unfavorable situation and the damage form of the structure under the fire, combined with the fire resistance of double-layer spherical latticed dome, the general fire resistance improvement rule of single layer spherical latticed dome is obtained by the performance-based fire safety design to improve the fire-resisting period and elasto-plastic stability under the fire.
引文
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[13]白音,翟建磊,石永久,等.单层网壳在高温状态下的整体稳定承载力分析[J].中国科学(技术科学),2013,43(3):291-297.BAI Yin,ZHAI Jianlei,SHI Yongjiu,et al.Analysis of overall stability bearing capacity of single-layer shell structures under high temperature condition[J].Sci China(Tech Sci),2013,43(3):291-297.
[2]YIN Zhixiang,ZHAO Jiapeng,ZHAO Sida.Study on performance of kiewitt single-layer spherical reticulated shell structure under the action of fire[J].Applied Mechanics and Materials,2014,2916(488):102-105.
[3]Alvarez A,Meacham B J,Dembsey N A,et al.Twenty years of performance-based fire protection design:Challenges faced and a look ahead[J].Journal of Fire Protection Engineering,2013,23(4):249-276.
[4]方正,程彩霞,卢兆明.性能化防火设计方法的发展及其实施建议[J].自然灾害学报,2003,12(1):63-68.FANG Zheng,CHENG Caixia,LU Zhaoming.Development of performance-based fire engineering and suggestion on its implementation[J].Journal of Natural Disasters,2003,12(1):63-68.
[5]施樑,吴军,蒋首超,等.钢结构建筑的消防安全性能化设计--系统方法探析[J].自然灾害学报,2006,15(6):159-163.SHI Liang,WU Jun,JIANG Shouchao,et al.Fire safety performance-based design of steel structural building exploration of systematic technology[J].Journal of Natural Disasters,2006,15(6):159-163.
[6]白音.大空间钢结构火灾下受力性能与抗火计算方法研究[D].北京:清华大学,2008:21-22.BAI Yin.Research on structural performance and fire-resistance of large-space steel structures under fire conditions[D].Beijing:Qinghua University,2008:21-22.
[7]李国强,杜咏.大空间建筑顶部火灾空气升温的参数分析[J].消防科学与技术,2005,24(1):19-22.LI Guoqiang,DU Yong.Analyses the parameters of fire temperature elevation at the top of large space buildings[J].Fire Science and Technology,2005,24(1):19-22.
[8]朱伟,侯建德,廖光煊.论性能化防火分析中的典型火灾场景方法[J].火灾科学,2004,13(4):251-255.ZHU Wei,HOU Jiande,LIAO Guangxuan.On the approach of typical fire scenario for performance-based fire protection analysis[J].Fire Safety Science,2004,13(4):251-255.
[9]曹正罡,范峰,沈世钊.K6型单层球面网壳的弹塑性稳定[J].空间结构,2005,11(3):22-26.CAO Zhenggang,FAN Feng,SHEN Shizhao.Elastic-plastic stability of K6 single layer latticed domes[J].Spatial Structures,2005,11(3):22-26.
[10]姜兰潮,杨乃勰.钢网壳抗火非线性有限元分析[J].中国安全科学学报,2006,16(2):39-42.JIANG Lanchao,YANG Naixie.Non-linear finite element analysis of fire resistance for steel truss dome[J].China Safety Science Journal,2006,16(2):39-42.
[11]杜咏,李国强.基于场模型的大空间建筑火灾钢构件升温的简化计算方法[J].消防科学与技术,2006,25(3):299-303.DU Yong,LI Guoqiang.Simplified algorithm of steel member at elevated temperature in large space fire based on field model[J].Fire Science and Technology,2006,25(3):299-303.
[12]乔达.单层球面网壳结构抗火性能分析[D].哈尔滨:哈尔滨工程大学,2013:40-46.QIAO Da.Fire resisting performance analysis of single layer spherical reticulated shells[D].Harbin:Harbin Engineering University,2013:40-46.
[13]白音,翟建磊,石永久,等.单层网壳在高温状态下的整体稳定承载力分析[J].中国科学(技术科学),2013,43(3):291-297.BAI Yin,ZHAI Jianlei,SHI Yongjiu,et al.Analysis of overall stability bearing capacity of single-layer shell structures under high temperature condition[J].Sci China(Tech Sci),2013,43(3):291-297.