海洋大气中桥梁盆式支座腐蚀失效故障树分析

摘要

腐蚀是桥梁盆式支座的常见病害之一，针对引起盆式支座腐蚀失效的各个因素，结合大气腐蚀、防腐涂装失效等机理，建立以盆式支座腐蚀失效为顶事件的故障树，通过布尔代数运算得到故障树的最小割集，从而得出导致支座腐蚀发生的主要因素，分析表明大气环境腐蚀因素、支座后期维护不善、支座局部构造不合理是导致支座腐蚀的主要因素，并针对这些原因提出了相应的改进措施和建议，以降低支座腐蚀失效发生的可能性。%Corrosion is one of the common diseases of bridge pot-bearings.Considering the various of factors that cause corrosion failure,combining with atmospheric corrosion mechanism and anticorrosive coatings failure mechanism,established a fault tree,of which top event is the corrosion failure of pot-bearings.The minimal cut-sets of the fault tree was obtained by Boolean operation,and then the impor-tant bottom events which caused corrosion failure of pot bearings were found.Results show that the main factors which cause corrosion failure of pot-bearings are marine atmospheric corrosive factors,poor main-tenance and unreasonable structure of pot-bearings.Some improvements with respect to the main factors had been proposed,which can reduce the possibility of corrosion failure.