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城市隧道混凝土墙火灾行为数值模拟研究
引用本文:刘扬. 城市隧道混凝土墙火灾行为数值模拟研究[J]. 消防科学与技术, 2020, 39(9): 1232-1235
作者姓名:刘扬
作者单位:青岛地铁集团有限公司,山东青岛266011
摘    要:为探究火灾作用下城市隧道混凝土墙的火灾行为规律,用有限元软件ABAQUS 建立三维混凝土墙数值模型,对其结构温度场分布进行数值模拟,分析得到墙体厚度、保护层厚度、火灾荷载比等因素对墙体变形的影响规律。结果表明:在火灾高温作用下,城市隧道混凝土墙受火面温度迅速升高,且由于混凝土的热惰性,内部会形成较大的温度梯度;混凝土墙体单面受火时的挠度变化规律可分为三个阶段,且火灾高温作用引起材料性能急剧劣化造成的截面中和轴偏移是影响墙体挠度变化的主要原因;混凝土墙体厚度、保护层厚度及火灾荷载比等因素对混凝土墙的火灾行为及其耐火性能均有一定影响,同时墙体挠度随火灾持续时间的增加而增大。

关 键 词:混凝土墙  隧道火灾  温度分布  火灾行为  影响因素  数值模拟  

Numerical simulation on fire behavior of concrete wall in urban tunnel
LIU Yang. Numerical simulation on fire behavior of concrete wall in urban tunnel[J]. Fire Science and Technology, 2020, 39(9): 1232-1235
Authors:LIU Yang
Affiliation:Qingdao Metro Group Co.,Ltd., Shandong Qingdao 266011, China
Abstract:In order to explore the fire behavior law of urban tunnel concrete walls under fire, the finite element software ABAQUS was used to establish a three- dimensional concrete wall numerical model, and the temperature field distribution of the structure was simulated by numerical simulation method. The effects of factors such as wall thickness, concrete cover thickness and axial compression ratio on wall deformation were analyzed. The results showed that the temperature of the heated surface of the concrete wall rises rapidly under fire, and a large temperature gradient will be formed inside due to the thermal inertia of the concrete. The deflection change of a concrete wall can be divided into three stages when one side is subjected to fire, and the main factor affecting the deflection change of wall is the deviation of section neutral axis caused by the rapid deterioration of material performance caused by the high temperature of fire. Factors such as the thickness of the reinforced concrete wall, the concrete cover thickness and the axial compression ratio all have certain influence on the fire behavior and fireresistance performance of the concrete wall. The wall deflectionwill increase with the increase of the fire duration.
Keywords:concrete wall,tunnel fire,temperature distribution  fire behavior,influence factor,numerical simulation,
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