Evaluation and retrofit of steel girder Shiplap connections

IF 0.7 Q4 CONSTRUCTION & BUILDING TECHNOLOGY
B. Kozy, Jonathan Beckstrom, Tim Armbrecht
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引用次数: 0

Abstract

Over time, owners may face challenges with management of bridges with outdated details. One such detail that is no longer used today is the steel girder shiplap connection. These were originally employed to simplify analysis of continuous girders while also moving joints away from the piers, improving longevity of bridge bearings and substructures. Unfortunately, fatigue issues have appeared in these connections resulting in cracking at critical load-carrying locations. In this project, analysis was performed to investigate connection fatigue and strength and retrofit design verification. Results utilizing non-linear analysis showed that while stresses from ultimate loading could adequately redistribute throughout the web, high stress concentrations were created, exacerbating fatigue. Stress calculations for shiplap web details are not well codified or easily assessed with simple hand calculations, so finite element analysis was utilized. Results showed web fatigue life had been exhausted with more cracking expected at other locations, convincing the owner retrofit was necessary even though the bridge was programmed for replacement.
钢梁船扣连接评价与改造
随着时间的推移,业主可能会在管理细节过时的桥梁方面面临挑战。如今不再使用的一个细节是钢梁搭接连接。这些最初用于简化连续梁的分析,同时也将接头从桥墩上移开,从而提高桥梁支座和下部结构的使用寿命。不幸的是,这些连接中出现了疲劳问题,导致关键承载位置出现裂纹。在该项目中,对连接疲劳和强度进行了分析,并对改造设计进行了验证。利用非线性分析的结果表明,虽然极限载荷产生的应力可以在整个腹板上充分重新分布,但会产生高应力集中,加剧疲劳。搭接腹板细节的应力计算没有很好的编码,也不容易用简单的手工计算进行评估,因此采用了有限元分析。结果显示,腹板疲劳寿命已经耗尽,预计其他位置会出现更多裂缝,这让业主相信,即使桥梁已被计划更换,也有必要进行改造。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Bridge Structures
Bridge Structures CONSTRUCTION & BUILDING TECHNOLOGY-
CiteScore
1.10
自引率
0.00%
发文量
5
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