张弦梁结构拱形空间火灾温度场及结构响应研究

【作者】 刘广林；

【导师】 陈长坤；

【作者基本信息】 中南大学 ， 消防工程， 2011， 硕士

【摘要】 张弦梁结构是近年来发展起来的一种新型大跨度预应力空间结构体系,该结构被应用于机场航站楼、体育馆、会展中心等人员密集的公共建筑场所。目前国内外对于张弦梁结构的研究主要在常温条件下开展,然而火灾是影响钢结构建筑安全的重要因素。本文依靠中国科学技术大学火灾科学国家重点实验室开放课题(HZ2009-KF05)与中南大学研究生教育创新工程学位论文创新资助项目(2010-SSXT036)的支持,以某单榀张弦梁结构为例,结合火灾科学与结构力学相关理论知识,采用火灾场模型与有限元分析方法,开展了大空间火灾下张弦梁结构火灾响应研究。本文主要完成了以下工作：(1)深入调研现有的火灾分析模型,选取适用于模拟大空间火灾的分析模型,最终选择计算精确度较高的火灾场模型。(2)采用场模拟软件FDS5.3开展不同火源功率、不同火源位置下大空间火灾数值模拟,研究拱形屋盖大空间火灾温度场分布规律,获取张弦梁结构构件热环境温度随时间的变化规律。(3)分析火灾发生时张弦梁结构构件受火边界,采用有限元方法模拟计算张弦梁结构构件截面温度分布,获取张弦梁结构构件温度随时间的变化规律。(4)采用有限元方法模拟计算张弦梁结构在不同火源功率、不同火源位置下的火灾响应行为,研究大空间火灾下张弦梁结构响应行为规律,并与IS0834标准火灾下张弦梁结构响应行为进行对比分析。(5)在张弦梁结构火灾响应行为分析的基础上,提出了张弦梁结构抗火设计的建议与措施。本文研究了张弦梁拱形空间火灾温度场分布规律,开展了大空间火灾与IS0834下张弦梁结构火灾响应行为研究工作,本文的研究方法和研究结果可为张弦梁结构抗火设计提供参考,为张弦梁结构性能化防火保护提供依据。更多还原

【Abstract】 As a new type of large-span pre-stressed steel structure, beam string structure (BSS) has developed in recent years. This structure has been widely used in airport terminals, sports stadiums, exhibition centers and other public buildings. Studies on BSS is currently carried out among ambient temperature at home and abroad, while building fire is an important factor affecting the safety of steel buildings. This research has been supported by the open Foundation of State Key Laboratory of Fire Science (HZ2009-KF05) and Postgraduate Educational Innovation Engineering of Central South University (2010-SSXT 036). Single BSS was analyzed by using the fire field model and the finite element method. The variation of BSS fire behavior was studied in large space fire.Postgraduate Educational Innovation Engineering of Central South UniversityThe following works have been fulfilled within this thesis:(1)Fire model was deeply investigated and analyzed. Fire model suitable for large space fire was selected scientifically. Finally, field model was chosen for its computing accuracy.(2) Considering different fire source power and fire source location, vaulted roof large space fire was simulated by using FDS5.3. Temperature field of large space and thermal environment of BSS were studied.(3) Fire boundaries of BSS member were analyzed in this thesis. Section temperature of BSS member was calculated using finite element method. The variation of section temperature along with time exposed to fire was obtained.(4) Fire behaviors of BSS were studied under different fire source power and fire source locations. The variation of BSS fire behavior was studied in large space fire. Fire behaviors of BSS under ISO834 were also calculated in this thesis. Comparison studies on structure behaviors of BSS were carried out between ISO834 and large space fires.(5)Based on fire response of BSS, some suggestions and measures on BSS fire resistance design were proposed.Temperature field of vaulted space of BSS has been studied in this thesis. Fire response behaviors of BSS have been analyzed under large space fires and ISO834. The study method and analysis on BSS could provide some references for BSS structural fire design. It also could provide a basis to fire protection design of BSS.更多还原