Abstract

Bridges are frequently subjected to permit loads. While deciding on permitting such loads, bridge owners usually adopt a tiered approach for structural analysis, assessment, and measurement. Under these complexities of decision-making, the owner can decide to adopt structural health monitoring (SHM) strategies in guiding the issuance of permits. A value of information (VoI) framework can be utilised by the owner to estimate the benefit of various SHM strategies. This study proposes a novel VoI framework which incorporates tiered assessments common in engineering practice. The proposed decision framework utilizes a generic approach to incorporate the successive tiers of measurement, analysis, and assessment. A real-world inspired case study of a reinforced concrete bridge pier crosshead subjected to high shear is used to demonstrate the proposed framework. Using a novel and practical tiered-assessment and multi-intervention option strategy, the potential monetary benefit of strain-based SHM strategies is quantified. It is found that the potential benefit of SHM is particularly high when high risks are involved. SHM is also found to be highly beneficial when slight changes in structural assessment could trigger different intervention actions by the stakeholder. The study also identifies the significant role that low-cost low-accuracy SHM strategies can play in decision guidance by providing adequate information for decision-making at a cheaper cost.

摘要

桥梁经常承受许可载荷。在决定允许此类荷载时，桥梁所有者通常采用分层方法进行结构分析、评估和测量。在这些复杂的决策下，业主可以决定采用结构健康监测（SHM）策略来指导许可证的发放。所有者可以利用信息价值 (VoI) 框架来估计各种 SHM 策略的收益。本研究提出了一种新颖的 VoI 框架，其中包含工程实践中常见的分层评估。建议的决策框架采用通用方法来合并测量、分析和评估的连续层次。一个受高剪切的钢筋混凝土桥墩十字头受现实世界启发的案例研究用于演示所提出的框架。使用新颖实用的分层评估和多干预选项策略，量化了基于应变的 SHM 策略的潜在货币收益。研究发现，当涉及高风险时，SHM 的潜在收益特别高。当结构评估的微小变化可能引发利益相关者的不同干预行动时，SHM 也被发现是非常有益的。该研究还确定了低成本、低准确度的 SHM 策略可以通过以更便宜的成本为决策提供足够的信息，在决策指导中发挥重要作用。基于应变的 SHM 策略的潜在货币收益被量化。研究发现，当涉及高风险时，SHM 的潜在收益特别高。当结构评估的微小变化可能引发利益相关者的不同干预行动时，SHM 也被发现是非常有益的。该研究还确定了低成本、低准确度的 SHM 策略可以通过以更便宜的成本为决策提供足够的信息，在决策指导中发挥重要作用。基于应变的 SHM 策略的潜在货币收益被量化。研究发现，当涉及高风险时，SHM 的潜在收益特别高。当结构评估的微小变化可能引发利益相关者的不同干预行动时，SHM 也被发现是非常有益的。该研究还确定了低成本、低准确度的 SHM 策略可以通过以更便宜的成本为决策提供足够的信息，在决策指导中发挥重要作用。