Abstract

Investigating the economic consequences of the natural hazards on the infrastructures is a crucial task in any risk-based decision-making process. Life-cycle cost (LCC) analysis is an important tool in both design (to choose the most economic configuration) and analysis (to estimate the future cost of ownership) stages. The pile-supported wharves, as one of the main parts in a marine harbor system, may experience significant deterioration (i.e. strength reduction) and seismic shaking during their life time. In this paper, damage cost in multiple limit states of a deteriorated pile-supported wharf due to chloride corrosion is calculated. A precise finite element model is developed to account for structural aging and the simultaneous seismic shaking. Aging-dependent seismic fragility functions are first developed using incremental dynamic analysis. Next, the LCC analysis is conducted considering the crane damage, as well as, inspection and maintenance costs. The results are calculated for three seismic hazard levels. The findings confirm significance of corrosion on LCC of pile-supported wharf. It is observed that corrosion may increase the LCC of the structure and system (i.e. structure and cranes) by 15% and 8%, respectively. Finally, a set of analytical formulations are proposed for performance index as a function of age, damage state, and seismic hazard level.

摘要

调查自然灾害对基础设施的经济影响是任何基于风险的决策过程中的一项关键任务。生命周期成本 (LCC) 分析是设计（选择最经济的配置）和分析（估计未来拥有成本）阶段的重要工具。桩式码头作为海上港口系统的主要组成部分之一，在其使用寿命期间可能会经历明显的劣化（即强度降低）和地震震动。在本文中，计算了由于氯化物腐蚀导致的桩式码头在多个极限状态下的损坏成本。开发了一个精确的有限元模型来解释结构老化和同时发生的地震震动。与老化相关的地震脆弱性函数首先是使用增量动态分析开发的。接下来，考虑起重机损坏以及检查和维护成本进行 LCC 分析。结果是针对三个地震危险等级计算的。研究结果证实了桩支撑码头 LCC 腐蚀的重要性。据观察，腐蚀可使结构和系统（即结构和起重机）的 LCC 分别增加 15% 和 8%。最后，提出了一组性能指标的分析公式，作为年龄、损坏状态和地震危险等级的函数。结构和起重机）分别降低 15% 和 8%。最后，提出了一组性能指标的分析公式，作为年龄、损坏状态和地震危险等级的函数。结构和起重机）分别降低 15% 和 8%。最后，提出了一组性能指标的分析公式，作为年龄、损坏状态和地震危险等级的函数。