Abstract

Facing the contradiction between increasing maintenance demand and limited financial, as well as smaller social and environmental impacts, the optimisation of bridge maintenance strategies should be carried out. In this paper, the assessment model of four objectives, including the safety performance, economic, social and environmental impacts, in sustainability criteria are proposed. Moreover, a systematic optimisation framework of maintenance strategy of deteriorating bridges considering sustainability criteria and a novel decision-making method are developed, based on fuzzy analytic hierarchy process (FAHP) and a decision-making algorithm based on linear programming techniques for multidimensional analysis of preference (LINMAP). The case analysis results verify the effectiveness and superiority of the previous optimisation framework, and also show that the final optimal strategy obtained by the proposed decision-making algorithm can reflect the will of experts well. Compare with the essential maintenance, the implementation of preventive maintenance is more conducive to realise the sustainable development of the deteriorating bridges. The sensitivity analysis results show that the monetary discount rate has a greater impact on the life cycle maintenance cost, which is mainly controlled by the total social cost, while the direct maintenance cost only accounts for a small part.

摘要

面对不断增加的维护需求与有限的资金以及较小的社会和环境影响之间的矛盾，应该对桥梁维护策略进行优化。本文提出了可持续性标准中的四个目标的评估模型，包括安全绩效，经济，社会和环境影响。此外，基于模糊层次分析法（FAHP）和基于线性规划技术的决策算法，建立了考虑可持续性标准的桥梁劣化维修策略的系统优化框架和决策方法。 （LINMAP）。案例分析结果证明了先前优化框架的有效性和优越性，并且还表明，所提出的决策算法获得的最终最优策略可以很好地反映专家的意愿。与基本维护相比，预防性维护的实施更有利于实现恶化桥梁的可持续发展。敏感性分析结果表明，货币贴现率对生命周期维护成本的影响较大，主要受社会总成本控制，而直接维护成本仅占很小一部分。