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为了更准确地评价火灾后混凝土桥梁的安全服役性能,建立了高温场结构响应模式,研究了模糊理论和相对隶属度。以现有火灾场模糊综合评判方法为原型,引入指数建立指数隶属度,调整样本宽度以达到优化权距的目的,提出了优权评判方法,对工程算例进行了分析,验证了其评判精度,并对其进行了安全评价。研究表明,该方法能有效缩小温度的判定差距,减小多种方法对火灾场温度推测数据之间的离散程度及方差分布。在火灾后桥梁服役功能安全评价方面,优权评判方法相对于其他方法所得到的计算值更接近目标值,优权评判方法适合于火灾高温场的测区温度判定、灾后结构变形的评价及服役功能的安全评价。
In order to evaluate the safe service performance of concrete bridge after fire more accurately, the structure response model of high temperature field is established and the fuzzy theory and relative membership degree are studied. Taking the existing fire field fuzzy comprehensive evaluation method as the prototype, this paper introduces exponential to establish exponential membership degree and adjust sample width to achieve optimal weighting distance. An evaluation method of privilege is proposed. The project example is analyzed to verify its accuracy , And conducted a safety assessment of it. The research shows that this method can effectively reduce the determination gap of temperature and reduce the degree of dispersion and variance distribution of the temperature speculation data of many kinds of methods. In terms of the functional safety evaluation of service bridges after fire, the weighting method of the weighting method is closer to the target value than other methods. The weighting method is suitable for the determination of the temperature of the fire zone in high temperature field, the evaluation of the structural deformation after disasters and the service Functional safety evaluation.