Abstract

Existing bridge performance metrics are limited in their ability to objectively reflect the safety and serviceability of bridges and identify effective Maintenance, Repair and Replacement (MR&R) actions for a large number of bridges in the face of budget constraints. This study presents a comprehensive optimal budget allocation framework with an integer linear programing formulation for a portfolio of bridges based on element-level inspection data. Considering budget constraints, this method determines optimal MR&R actions at element-level such that agency and user costs of repair actions required to have bridges in their like-new state at the next budget allocation year are minimized. The framework incorporates structural safety risks via the probability that the designated structural functionality of a bridge is or deemed to be compromised. The approach is applied to 484 National Highway Systems bridges in district 3 of Ohio. Results indicate that the proposed method can identify work plans comprising the optimal set of MR&R actions that maximize the network-level performance of bridge portfolios, while satisfying budgetary constraints. It is observed that this method consistently assigns higher priority to work plans that reduce structural safety risks of bridges, and to bridges with high traffic demands and long detour lengths.

摘要

现有的桥梁性能指标在客观反映桥梁的安全性和可维护性以及在预算限制的情况下为大量桥梁确定有效的维护、维修和更换 (MR&R) 行动方面的能力有限。本研究提出了一个全面的最佳预算分配框架，该框架具有基于元素级检查数据的桥梁组合的整数线性规划公式。考虑到预算限制，此方法在元素级别确定最佳 MR&R 行动，以便在下一个预算分配年度使桥梁处于类似新状态所需的维修行动的代理和用户成本最小化。该框架通过桥梁的指定结构功能被或被认为受到损害的可能性来纳入结构安全风险。该方法应用于俄亥俄州第 3 区的 484 座国家公路系统桥梁。结果表明，所提出的方法可以确定包含最佳 MR&R 行动集的工作计划，这些行动可以最大限度地提高桥梁投资组合的网络级性能，同时满足预算限制。据观察，该方法始终将更高的优先级分配给降低桥梁结构安全风险的工作计划，以及交通需求高和绕行长度长的桥梁。在满足预算约束的同时，最大化桥接组合的网络级性能的 R 操作。据观察，该方法始终将更高的优先级分配给降低桥梁结构安全风险的工作计划，以及交通需求高和绕行长度长的桥梁。在满足预算约束的同时，最大化桥接组合的网络级性能的 R 操作。据观察，该方法始终将更高的优先级分配给降低桥梁结构安全风险的工作计划，以及交通需求高和绕行长度长的桥梁。