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An Age- and Condition-Dependent Variable Weight Model for Performance Evaluation of Bridge Systems
KSCE Journal of Civil Engineering ( IF 2.2 ) Pub Date : 2021-02-12 , DOI: 10.1007/s12205-021-1243-y
Yuan Ren , Xiang Xu , Bin Liu , Qiao Huang

To address the balance problem between indexes within the performance evaluation of bridge systems, this paper develops an age- and condition-based variable weight model (ACVWM). First, the limitations of existing models used for the multi-layer weighted sum method, i.e., constant weight model (CWM) and condition-based variable weight model (CVWM), are presented through case studies, indicating that the weight variation is insufficient to characterize the deterioration law of components. Then, the definition of age-based variable weight is established following the existing concept of condition-based variable weight, which makes weights vary with service ages. Considering the characteristics of bridge assessment, an age-based variable weight model is built up to depict the time-variant trends of index weights with the service age. The variation law of age-based variable weight is discussed by using indexes in the superstructure of suspension bridges. As a result, the weights of replaceable and permanent components behave differently within the bridge service life. Finally, the ACVWM is built up and its effectiveness is verified through the same case studies applied to the CWM and CVWM. Compared with the evaluation results from the CWM and CVWM, the evaluation result of the ACVWM is more in line with the real maintenance strategy. Considering the CVWM in which low initial weights may lead to unsatisfactory weight assignment, the advantage of the proposed ACVWM lies in its capability to adjust initial weights over the service age.



中文翻译:

基于年龄和条件的可变重量模型,用于桥梁系统性能评估

为了解决桥梁系统性能评估中指标之间的平衡问题,本文建立了基于年龄和条件的可变权重模型(ACVWM)。首先,通过案例研究,介绍了多层加权和方法所使用的现有模型的局限性,即恒重模型(CWM)和基于条件的可变权重模型(CVWM),这表明权重变化不足以解决问题。表征部件的劣化规律。然后,根据现有的基于条件的可变权重的概念来建立基于年龄的可变权重的定义,这使权重随服务年龄而变化。考虑到桥梁评估的特点,建立了基于年龄的可变权重模型,以描述指标权重随服务年龄的时变趋势。利用悬索桥上部结构中的指标,讨论了基于年龄的可变权重的变化规律。结果,在桥梁使用寿命内,可更换部件和永久部件的重量会有所不同。最后,建立了ACVWM,并通过应用于CWM和CVWM的相同案例研究验证了其有效性。与CWM和CVWM的评估结果相比,ACVWM的评估结果更符合实际的维护策略。考虑到CVWM的初始权重低可能导致权重分配不令人满意,因此所提出的ACVWM的优势在于其能够在使用期限内调整初始权重的能力。在桥梁使用寿命内,可更换部件和永久部件的重量表现各不相同。最后,建立了ACVWM,并通过应用于CWM和CVWM的相同案例研究验证了其有效性。与CWM和CVWM的评估结果相比,ACVWM的评估结果更符合实际的维护策略。考虑到CVWM的初始权重低可能导致权重分配不令人满意,因此所提出的ACVWM的优势在于其能够在使用期限内调整初始权重的能力。在桥梁使用寿命内,可更换部件和永久部件的重量表现各不相同。最后,建立了ACVWM,并通过应用于CWM和CVWM的相同案例研究验证了其有效性。与CWM和CVWM的评估结果相比,ACVWM的评估结果更符合实际的维护策略。考虑到CVWM的初始权重低可能导致权重分配不令人满意,因此所提出的ACVWM的优势在于其能够在使用期限内调整初始权重的能力。ACVWM的评估结果更符合实际的维护策略。考虑到CVWM的初始权重低可能导致权重分配不令人满意,因此所提出的ACVWM的优势在于其能够在使用期限内调整初始权重的能力。ACVWM的评估结果更符合实际的维护策略。考虑到CVWM的初始权重低可能导致权重分配不令人满意,因此所提出的ACVWM的优势在于其能够在使用期限内调整初始权重的能力。

更新日期:2021-04-13
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