基于群索索力相异测度的斜拉桥健康状态评估

Health Status Evaluation of Cable Stayed Bridge Driven By Dissimilarity Measures of Grouped Cable Forces

摘要:

基于群索索力的相异测度，提出一套可用于斜拉索索缆承重体系内力状态评估的指标体系。利用桥梁的有限元分析及影响矩阵法，定义了基于极限状态的相异测度指标阀值，并通过蒙特卡罗方法获得这套指标阀值的合理取值。通过该套指标与其阀值体系的比较，建立了斜拉桥整体内力状态的评判方法。利用国内某斜拉桥建成后十年内的斜拉索索力实测资料，用上述方法对该桥进行了健康评估，结果表明了该方法的有效性。

Abstract:

An index system for evaluation of the health status of cable stayed bridge is presented based on a set of dissimilarity measures (abbr. DM) of cable force of grouped cables. The thresholds of DM derived from the serviceability limit state and ultimate limit state of the bridge are defined by the combination of FEM and influence matrixes method. The Monte-Carlo method is used to obtain the rational values of these thresholds. By comparing these indices with its thresholds, the discrimination on holistic health status of cable stayed bridge can be done easily and explicably. By using the 8 years historical data of cable forces investigated from an real cable stayed bridge, the proposed method are applied to evaluate the health status of an real cable stayed bridge. The results show the validity of proposed methods.