随着桥梁交通流量的不断增大，桥梁面临的汽车燃烧风险越来越高，本文利用熵权模糊综合评判法对桥梁运营期汽车燃烧风险进行分析。根据模糊综合评判原理建立综合评判指标体系，利用熵权法计算获得模糊综合评判各风险指标因素的权重，有效解决了权重分配困难的问题，提出了基于熵权模糊综合评判的桥梁运营期汽车燃烧风险水平评价模型，并将其应用到武汉鹦鹉洲长江大桥运营期汽车燃烧风险分析。结果表明：油罐车发生燃烧事故的风险水平为0.021443次/年，处于偶尔风险发生水平；小汽车发生燃烧事故的风险水平为0.234261次/年，处于可能风险发生水平；客车发生燃烧事故的风险水平为0.120771次/年，处于可能风险发生水平；货车发生燃烧事故的风险水平为0.042219次/年，处于可能风险发生水平。研究结果为桥梁抗火设计与防范措施提供理论决策依据。%As the traffic flow increases, the risk of burning vehicle is higher and higher on the bridge. This paper introduced fuzzy comprehensive evaluation method to analyze the risk of vehicle burning accident. According to the principle of fuzzy comprehensive evaluation to establish comprehensive evaluation index system, using the entropy weight method to obtain the weight of various indicators of risk factors of fuzzy comprehensive evaluation, it is effectively solve the problem of weight allocation. So we established the risk analysis model of vehicle burning accident during bridge operation period based on entropy weight fuzzy comprehensive evaluation, this model was used to analyze the risk of vehicle burning on YingWuZhou Yangtze River Bridge. And it showed that tank burning accident risk level was 0. 021443 times/year, in occasional risk level; car burning accident risk level was 0. 234261 times/year, in a possible risk level; coach burning accident risk level was 0. 120771 times/year, in a possible risk level; truck burning accident risk level was 0. 042219 times/year, in a possible risk level. It could play certain reference significance for Fire design of Bridges and the preventive measures.
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