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首页> 外文期刊>Journal of bridge engineering >Failure Characteristics and Ultimate Load-Carrying Capacity of Redundant Composite Steel Girder Bridges: Case Study
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Failure Characteristics and Ultimate Load-Carrying Capacity of Redundant Composite Steel Girder Bridges: Case Study

机译：冗余复合钢梁桥的破坏特性和极限承载力：案例研究

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With the existence of aging highway bridges within the U.S. transportation network, federal and local agencies typically encounter a wide assortment of maintenance issues ranging from cracking, spalls, delaminations, and corrosion to high load hits and fire damage. This paper presents an approach for capturing the full system-based behavior and stages of failure in the composite bridge superstructures as they approach ultimate capacity. This step is instrumental to understanding how redundant bridges behave in the presence of coupled and uncoupled damage and deteriorations. The investigation included a comprehensive nonlinear finite-element analysis of two representative intact composite steel girder bridges that were tested to failure and provided sufficient details for model validation. Results demonstrate the high degree of additional reserve capacity, inherent to redundant superstructures, over the theoretical nominal design capacity. A rational approach was established to describe the actual system-based ultimate capacity, which was not explicitly considered in the current design methodology. In addition, a limited sensitivity study was performed on one of the selected representative bridges to investigate the sensitivity of the characterized failure stages to variations in the geometrical parameters and material properties of the bridge system. (C) 2014 American Society of Civil Engineers.
机译：由于美国交通网络中老化的公路桥梁的存在，联邦和地方机构通常会遇到各种各样的维护问题，从开裂，剥落，分层和腐蚀到高负载冲击和火灾损坏。本文提出了一种在复合桥上部结构接近极限承载力时捕获基于全系统行为和破坏阶段的方法。此步骤有助于理解冗余桥在耦合和非耦合的损坏和恶化情况下的行为。调查包括对两个代表性完整复合钢梁桥的全面非线性有限元分析，这些桥梁经过了破坏测试，并为模型验证提供了足够的细节。结果表明，冗余的上部结构固有的额外备用容量比理论上的名义设计容量高。建立了一种合理的方法来描述基于系统的实际极限容量，当前的设计方法中并未明确考虑。此外，对选定的代表性桥梁之一进行了有限度敏感性研究，以研究特征性破坏阶段对桥梁系统几何参数和材料特性变化的敏感性。 （C）2014年美国土木工程师学会。

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