Reliability Index for Structural Health Monitoring of Aging Bridges

桥(图论) 可靠性(半导体) 可靠性工程 失效模式及影响分析 索引(排版) 结构健康监测 工程类 结构工程 计算机科学 量子力学 医学 物理 内科学 万维网 功率(物理)
作者
P. B. R. Dissanayake,P. A. K. Karunananda
出处
期刊:Structural Health Monitoring-an International Journal [SAGE Publishing]
卷期号:7 (2): 175-183 被引量:19
标识
DOI:10.1177/1475921708090555
摘要

This paper presents a reliability-based methodology for health monitoring of aging bridges. Initially, critical failure criteria are proposed depending on the type of bridge. Safety margins are then defined based on these criteria. It is assumed that quantities in the failure criteria are random variables that are normally distributed. Based on this assumption, elementary reliability indices and thereby elementary failure probabilities are estimated for each critical failure mode. Having found the elementary failure probability values, system failure probability of the bridge is calculated for the period under consideration. Finally, the system failure probability is used to obtain a system reliability index of the bridge. The system reliability index is a quantative way to express the condition of the bridge for the period under consideration. As a case study to illustrate the proposed reliability procedure, a wrought iron railway bridge was selected from the national railway bridge network of Sri Lanka. For this bridge, fatigue and corrosion were selected as the most critical forms of failure. Application of the proposed methodology showed that the present condition of bridge was satisfactory for current loading conditions. Predicting reliability, as opposed to damage, is a positive outlook approach to health monitoring that is useful for infrastructure management.
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