基于改进熵权-未确知测度理论的在役混凝土梁桥安全性评价

Safety Assessment of Reinforced Concrete Girder Bridges Based on Information Entropy-Unascertained Measure Theory

为了研究混凝土梁桥主要受力构件的安全状况,从而系统、客观的评估桥梁的安全性状况。首先根据混凝土梁式桥的特点以及《公路桥梁技术状况评定标准》确定梁式桥安全性评价对象为:主梁、行车道板、盖梁、墩台(身)、横向联系;然后根据《可靠性鉴定标准》确定评价对象的安全性评价指标体系,确定单指标测度函数,同时利用改进熵权法确定各个评价指标的权重,依据梁桥安全性评价指标的实测值计算出单指标测度评价矩阵和多指标测度评价向量。最后按置信度准则确定梁桥安全性评价对象的评价等级并用实例验证该方法的有效性。结论表明,该方法能够较好的反应钢筋混凝土梁桥各个主要构件的安全性能,从而为桥梁的维修加固提供理论依据。

In order to study the safety condition of the main stressed members of reinforced concrete beam bridge,the safety condition of the bridge is evaluated systematically and objectively,which provides scientific basis for the maintenance and reinforcement of the bridge.The information entropy unascertained measure theory is used to construct the safety evaluation model of reinforced concrete bridge.Firstly,the safety evaluation object of the beam bridge is determined according to the characteristics of the reinforced concrete beam bridge and the highway bridge technical condition evaluation standard.Then according to the appraisal standard of reliability evaluation objects of safety evaluation index system and single index measurement function,at the same time the use of information entropy to determine the weight of each evaluation index,based on the measured values of bridge safety evaluation index to calculate the matrix measure single index and multiple indices measure evaluation vector,finally according to confidence criterion to determine the bridge safety evaluation object level of evaluation of the effectiveness of the proposed method is verified by an example.The results show that this method can better reflect the safety performance of every main component of reinforced concrete girder bridge,and thus provide theoretical basis for bridge maintenance.