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以某高低塔PC斜拉桥为背景,针对其辅助墩上拉压力支座在运营阶段拉力螺杆失效的情况,结合该桥的实测温度数据与有限元模型计算结果分析了温度荷载对该拉压支座受力和纵向变形的影响,采用基于两阶段法的层次分析法确定了不同种类温度效应的影响权重。计算结果表明:体系最大升温温差、主梁正温度梯度、索梁负温差为影响该拉压支座的最不利温度荷载组合,在该组合下温度荷载对该拉压支座受力的影响超过10%,且引起的纵向变形占到该拉压支座纵向允许变形量的30%以上;主梁温度梯度对辅助墩拉压力支座的支反力影响最大,索梁温差其次;体系温差对于支座处主梁纵向位移影响最大;主梁温度梯度和体系温差两者占影响拉压力支座的温度荷载的80%左右;研究成果对于同类型桥梁拉压支座失效的分析研究具有一定的参考价值。
Taking a tower PC cable-stayed bridge as a background, aiming at the failure of the tension pier of the auxiliary pier in the operating phase, the relationship between the temperature load and the tensile load was analyzed based on the measured temperature data and the finite element model calculation results. Bearing force and longitudinal deformation, the analytic hierarchy process based on two-stage method was used to determine the influence weight of different kinds of temperature effects. The calculation results show that the maximum temperature difference, the positive temperature gradient of the main girder and the negative temperature difference of the girder affect the most unfavorable temperature load of the tension-compression bearing, and the temperature load affects the stress of the tension-compression bearing more than 10%, and the longitudinal deformation caused by it accounts for more than 30% of the allowable longitudinal deformation of the tension and compression support; the temperature gradient of the main beam has the strongest influence on the support force of the tension support of the auxiliary pier, The longitudinal displacement of the main girder at the abutment has the greatest impact; both the temperature gradient of the main girder and the temperature difference of the system account for about 80% of the temperature load of the bearing of the compression bearing; the research results have shown that the failure analysis of the same type of tension- Reference value.