[论文解读] A Performance-Based Framework for Bridge Preservation Based on Damage-Integrated System-Level Behavior

Amir Gheitasi, Davin K. Harris|arXiv (Cornell University)|Feb 11, 2014

Concrete Corrosion and Durability参考文献 4被引用 8

一句话总结

本文提出了一种基于性能的桥梁养护框架，通过经验证的数值分析方法，评估组合钢梁桥在综合损伤情景下的系统级行为。结果表明，多种损伤机制的综合作用显著降低了结构的极限承载力、冗余度和延性，为设计、养护与修复之间的关键衔接提供了支持，有助于提升基础设施决策水平。

ABSTRACT

The safety and condition of transportation infrastructure has been at the forefront of national debates in recent times due to catastrophic bridge failures, but the issue has been a longstanding challenge for transportation agencies for many years as resources continue to diminish. The performance of this infrastructure has a direct influence on the lives of most of citizens in developed regions by providing a critical lifeline between communities and the transportation of goods and services, and as a critical component of the transportation network, bridges have received a lot of attention regarding condition assessment and maintenance practices. Despite successful implementation of advanced evaluation techniques, what is still lacking is a fundamental understanding of the system behavior in the presence of deteriorating conditions that can be used for preservation decision-making. This paper aims to present a performance-based framework that can be used to characterize the behavior of in-service bridge superstructures. In order to measure the bridge system performance with deteriorating conditions, system-level behavior of a representative composite steel girder bridge, degraded with three common damage scenarios was investigated in this study. Results obtained from validated numerical analysis demonstrated significant impact of integrated damage mechanisms on the ultimate capacity, redundancy and system ductility of the simulated bridge superstructure. It is expected that the proposed framework for evaluating system behavior will provide a first step for establishing a critical linkage between design, maintenance, and rehabilitation of highway bridges, which are uncoupled in current infrastructure decision-making processes.

研究动机与目标

• 为解决当前在桥梁退化条件下缺乏对系统级行为的系统性理解，以改善养护决策制定。
• 开发一种将高速公路桥梁管理中的设计、养护与修复流程相连接的框架。
• 量化多种综合损伤机制对极限承载力、冗余度和延性等结构性能指标的影响。
• 为基于性能的桥梁养护决策支持提供基础，借助数值模拟实现。

提出的方法

• 本研究采用经验证的代表性组合钢梁桥有限元模型，模拟三种常见损伤情景下的系统级行为。
• 将多种损伤机制整合至模型中，以反映多个构件的现实退化模式。
• 采用非线性静力推覆分析评估结构在逐渐增加侧向荷载下的性能，捕捉极限承载力与变形能力。
• 从模拟桥梁上部结构的响应曲线中量化性能指标，包括极限荷载承载力、冗余度和延性。
• 将构件层面的损伤效应整合至系统级评估中，以反映实际结构行为。
• 对结果进行分析，评估多种损伤机制共同作用下系统性能相较于单一损伤情况的变化。

实验结果

研究问题

• RQ1 综合损伤机制如何影响桥梁上部结构的极限承载力？
• RQ2 在多种损伤共同作用下，系统级冗余度与延性降低的程度如何？
• RQ3 基于性能的框架能否通过系统级行为评估，有效连接设计、养护与修复决策？
• RQ4 多种损伤模式的共存如何影响组合钢梁桥的整体结构性能？

主要发现

• 与单一损伤情况相比，综合损伤机制显著降低了桥梁上部结构的极限承载力。
• 当多种损伤模式同时存在时，桥梁系统的冗余度与延性显著下降。
• 数值模型准确捕捉了复杂损伤情景下的非线性行为与破坏发展过程，验证了其在系统级评估中的适用性。
• 该框架通过考虑多种退化机制的相互作用，实现了对结构性能更真实的评估。
• 研究结果凸显了当前决策流程的局限性，即设计、养护与修复被视作相互独立的活动。
• 本研究为基于性能的养护策略奠定了基础，有助于提升高速公路桥梁的可靠性与使用寿命。