基于变权综合原理的斜拉桥索力、线形状态评估

Assessment the Cable Tension and the Linetype State of Cable-Stayed Bridge Based on Variable Weight Synthesis

基于变权综合原理,建立斜拉桥索力、线形状态评估模型。以约束优化索力值为基准值,引入索力上下限;以成桥线形作为基准值,以控制点的竖向允许位移高次插值形成线形评估的上下限。编制状态评估算法,利用变权综合原理和斜率关联度,以适度指标模型进行线性插值,并根据一组实测数据,对索力、线形状态进行评估。计算结果表明,随着均衡系数的减小,桥梁构件评估结果是一个加速退化的过程;变权模式作用下的变权权重越发散,评估结果的退化过程越剧烈,均衡系数-评分曲线的曲率越大。对于每个测点评分状态完全一致的桥梁构件,其均衡系数-评分曲线的曲率恒等于0,即评估结果将与均衡系数的取值无关,数值模拟结果与预测基本吻合。

Based on variable weight synthesis principle, a cable tension and linetype state assessment model of cable-stayed bridge was established. With the optimized restraint value of cable tension as criterion, upper and lower limit was then proposed. Algorithm of state assessment was programmed, using moderate index model to interpolate linearly, and with the application of variable weight synthesis principle and correlation of slope coefficient, according to a set of measured data, state of cable tensions and linetype were calculated. Calculation results show that with the decrease of balanced coefficient, the assessment result is a process of degradation. The more divergent variable weight is, the more severe the degradation of the bridge component assessment and the largger the curvature of curve will be. It is predicted that, for those bridge component that grade of single survey point is exactly the same, the curvature of curve is constant zero, i.e. , there is no correlation between the assessment result and the balanced coefficient. Numerical simulation results show that it agrees quite well with the expectation.