基于优化索力的斜拉桥索力状态评估研究

在恒载索力优化模型基础上，以荷载组合作用下的弯矩包络图正负绝对值相等时的恒载弯矩分布作为优化目标，通过约束主梁线形及索力不均匀系数，最终确定斜拉桥的合理恒载索力.建立了斜拉桥索力状态评估模型，并以优化的恒载索力为索力评估的基准值，引入索力上下限以及斜率关联度，利用层次分析法和变权综合原理，根据一组实测数据对索力性能进行评估.计算结果表明，实测索力与标准索力之间具有较高的关联度，随着均衡系数α的减小，索力评估结果是一个退化的过程.

Assessment of cable tension condition based on optimum cable tension of cable-stayed bridge

A constrained optimization method for cable tensions under dead loads was applied.By constraining elevation of girder and asymmetric coefficient of cable tensions,the reasonable cable tensions under dead loads were obtained with the moment distribution taken as object,which made the absolute value of negative moment envelope diagram equal those of positive one under combined loads. A condition assessment model of cable tensions was then proposed.Based on analytic hierarchical process(AHP) and variable weight synthesizing method,the performance of cable tensions was evaluated based on a sequence of measured data with the application of correlation of slope coefficient.Results showed that the correlation between slope coefficients of the measured and standard cable tensions is relatively high.With the decrease of balance coefficient,the estimated performance is a process of degeneration.