超瘦高中庭自然排烟方式可行性研究
发布时间：2018-08-24 11:31
【摘要】：科学技术的进步和时代需求促使超高层建筑迅猛发展,中国现存和在建的超高层建筑数量呈逐年增加的趋势,约2020年左右,中国将成为全球范围内超高层建筑最多的国家。随着超高层建筑的增多,一些又“瘦”又“高”具有明显“竖井”的特点的超高中庭数量也呈逐年增加趋势,并受到了设计师和人们的一致认可。然而,由于中庭空间高度较高且截面积较小,火灾时易形成烟囱效应,导致烟气范围迅速扩大,因此如何设计超瘦高中庭的烟气控制系统以保证超瘦高中庭的消防安全是研究人员不得不面对的新挑战。本文根据超瘦高中庭的空间特征,分析超瘦高中庭建筑的火灾特点和影响烟气运动的相关因素,并针对影响中庭自然排烟的因素,基于相关理论公式和FDS火灾模拟软件,采用理论和数值模拟结合的方法得到了超瘦高中庭能够进行自然排烟的临界条件。由中庭火灾烟气蔓延规律定义了羽流临界区高度,基于羽流质量变化规律分析及中性面模型,对超瘦高中庭羽流进行了研究,且与FDS数值模拟结果进行了对比验证。分析了超瘦高中庭分别在单独热压情况下以及外界风与热压同时作用下自然排烟的临界条件,并研究了超瘦高中庭线性温度分层和区域分层情况下对自然排烟效果的影响。
[Abstract]:The progress of science and technology and the needs of the times promote the rapid development of super-high-rise buildings. The number of existing and ongoing super-tall buildings in China is increasing year by year. About 2020, China will become the largest country with super-tall buildings in the world. With the increase of super-tall buildings, the number of ultra-high atrium which is "thin" and "high" has been increasing year by year, and has been accepted by designers and people. However, because of the high height of atrium space and the smaller cross section, the chimney effect is easy to form in the fire, which results in the rapid expansion of the smoke range. Therefore, how to design the smoke control system of super thin atrium to ensure the fire safety of super thin atrium is a new challenge that researchers have to face. According to the spatial characteristics of super thin atrium, this paper analyzes the fire characteristics of super thin atrium building and the related factors affecting smoke movement. Aiming at the factors that affect the natural smoke emission of the atrium, based on the relevant theoretical formula and FDS fire simulation software, this paper analyzes the fire characteristics of the super thin atrium building and the related factors affecting the smoke movement of the atrium. The critical conditions for natural smoke emission from super thin atrium were obtained by combining theory and numerical simulation. The height of the plume critical zone is defined by the smoke spread law of atrium fire. Based on the analysis of the plume mass variation law and the neutral surface model, the plume in the super-thin atrium is studied, and the results are compared with the results of FDS numerical simulation. In this paper, the critical conditions of natural smoke exhaust in super thin atrium under single hot pressing and the simultaneous action of external wind and hot pressing were analyzed, and the effects of linear temperature stratification and regional stratification on the natural smoke exhaust were studied.
【学位授予单位】：沈阳航空航天大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU972.4
本文编号：2200690
[Abstract]:The progress of science and technology and the needs of the times promote the rapid development of super-high-rise buildings. The number of existing and ongoing super-tall buildings in China is increasing year by year. About 2020, China will become the largest country with super-tall buildings in the world. With the increase of super-tall buildings, the number of ultra-high atrium which is "thin" and "high" has been increasing year by year, and has been accepted by designers and people. However, because of the high height of atrium space and the smaller cross section, the chimney effect is easy to form in the fire, which results in the rapid expansion of the smoke range. Therefore, how to design the smoke control system of super thin atrium to ensure the fire safety of super thin atrium is a new challenge that researchers have to face. According to the spatial characteristics of super thin atrium, this paper analyzes the fire characteristics of super thin atrium building and the related factors affecting smoke movement. Aiming at the factors that affect the natural smoke emission of the atrium, based on the relevant theoretical formula and FDS fire simulation software, this paper analyzes the fire characteristics of the super thin atrium building and the related factors affecting the smoke movement of the atrium. The critical conditions for natural smoke emission from super thin atrium were obtained by combining theory and numerical simulation. The height of the plume critical zone is defined by the smoke spread law of atrium fire. Based on the analysis of the plume mass variation law and the neutral surface model, the plume in the super-thin atrium is studied, and the results are compared with the results of FDS numerical simulation. In this paper, the critical conditions of natural smoke exhaust in super thin atrium under single hot pressing and the simultaneous action of external wind and hot pressing were analyzed, and the effects of linear temperature stratification and regional stratification on the natural smoke exhaust were studied.
【学位授予单位】：沈阳航空航天大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU972.4
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