基于可拓理论对混凝土梁桥的可靠性评价

Reliability Evaluation of the Concrete Girder Bridge based on the Extension Theory

目的研究一种适用于钢筋混凝土梁桥的可靠性评价模型,为桥梁的可靠性做出合理的综合评价提供科学客观依据.方法采用可拓学的理论和方法应用于混凝土梁桥的可靠性评价,建立适用于桥梁可靠性可拓评价的物元模型,通过可拓集合理论及关联函数以及各指标的权重,可以精确确定待评价桥梁可靠性状态的关联度及其所属等级.结果由关联度的计算结果可得到K2(P0)=-0.62为最大值,由评定准则可知桥梁的可靠性状态等级为Ⅱ级,属于健康状况一般,需要日常的小修保养.结论可拓理论对混凝土梁桥可靠性进行的分析、预测,对桥梁的可靠性做出合理的综合评价,能够为桥梁的病害防治和维修加固决策提供参考和理论依据.

This paper developed an evaluation model applicable to the reliability of the reinforced concrete girder bridge, to provide a scientific and objective basis for making reasonable comprehensive evaluation of the bridge reliability. Extenics theory and methods are used in reliability evaluation of concrete girder bridge to establish extension evaluation matter-element model that is suitable for bridge reliability, based on exten- sion set theory and correlation function and the weight of each indicator which can accurately determine state of evaluation bridge reliability correlation degree and its subordinate level. By the correlation degree calcula- tion, results K2 （P0） = -0.62 can be obtained for the maximum correlation, by the evaluation criterion, it shows the reliability of the bridge state level for I1 level, which belongs to general health, needing daily re- pairs and maintenance. Extension theory can analyze, forecast concrete girder bridge reliability and make rea- sonable comprehensive evaluation of bridge reliability, so as to provide reference and theoretical basis for disease prevention and control of maintenance and strengthening of bridges.