考虑部件相关性的斜拉桥状态评估

为提高斜拉桥评估可靠性,开展考虑部件相关性的斜拉桥状态评估研究.首先建立斜拉桥系统各部件故障传递有向图,基于Pagerank算法分析各部件相关性,得到部件的影响度和被影响度;其次,针对人工检查指标,建立分段线性扣分评定标准,针对健康监测指标,根据力学模型设定主梁挠度和索力的评定标准;最后,考虑部件单独产生的故障率和其他...

Cable-stayed bridge condition evaluation considering component correlation

To improve the reliability of cable-stayed bridge evaluation, the condition evaluation of cable-stayed bridge considering component correlation was carried out. Firstly, the directed diagram of fault transmission of each component in cable-stayed bridge system was established, and the correlation of each component was analyzed based on Pagerank algorithm to obtain the influencing degree and influenced degree of each component. Secondly, the piecewise linear deduction evaluation criteria of manual inspection indicators were established. For health monitoring indicators, the evaluation criteria of girder deflection and cable force were set according to mechanical model. Finally, considering the failure rate of individual components and the influenced degree of other component faults, a condition evaluation method with component correlation for cable-stayed bridge was proposed. Taking a super long-span steel cable-stayed bridge as an example, the proposed method was compared with the relevant evaluation specifications. The results show the influencing degree and influenced degree of girder alignment, cable force and tower alignment are great, which are important indicators for bridge health monitoring. Girder appearance inspection and bridge bearing have high influenced degree but low influencing degree, which are the fault appearance components. They should be paid attention to in preventive maintenance. The drainage system and electromechanical facilities are the fault source components that have low influenced degree and high influencing degree. They must be kept in good condition. The evaluation method established in this paper has comprehensive indicators and takes into account the correlation of components. Therefore, the evaluation results are more reliable and can provide basis for bridge maintenance decision-making.