An Age- and Condition-Dependent Variable Weight Model for Performance Evaluation of Bridge Systems

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