工字钢桥梁典型跨框架细部疲劳试验评价

IF 3.1 2区 工程技术 Q2 ENGINEERING, CIVIL Journal of Bridge Engineering Pub Date : 2023-11-01 DOI:10.1061/jbenf2.beeng-6402
Matthew C. Reichenbach, Anthony D. Battistini, Sean Donahue, Todd A. Helwig, Michael D. Engelhardt, Karl H. Frank
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引用次数: 0

摘要

在安装和甲板施工过程中,交叉框架主要作为钢i型梁系统的稳定支撑,如果没有适当的详细说明,在成品组合结构中容易受到载荷引起的疲劳问题的影响。由于连接的偏心,交叉框架经常受到显著的面内和面外弯曲影响,从而影响其抗疲劳能力。本文记录了一项全面实验室研究的结果,该研究评估了普通焊接跨框架结构和细节的疲劳性能。18个独特的跨框架面板,包括各种典型和建议的连接细节,被制作和测试在循环荷载下的破坏,模拟活载交通对组合梁系统的影响。根据这项实验研究的结果,实践中普遍使用的许多细节都显示出较差的疲劳特性,这是由于(1)焊缝附近存在局部应力集中和/或(2)在分析和设计中未明确考虑明显的弯曲应力。相反,提出的细节减轻了这些影响,并随后发现提高了跨框架系统的疲劳寿命。
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Experimental Fatigue Evaluation of Typical Cross-Frame Details in Steel I-Girder Bridges
Cross-frames, which primarily serve as stability braces in steel I-girder systems during erection and deck construction, are susceptible to load-induced fatigue problems in finished composite structures if not properly detailed. Due to eccentricity in the connections, cross-frames are often subjected to significant in-plane and out-of-plane bending effects that can affect the fatigue resistance. This paper documents the results of a full-scale laboratory study that evaluates the fatigue performance of common welded cross-frame configurations and details. Eighteen unique cross-frame panels, including various typical and proposed connection details, were fabricated and tested for failure under cyclic loading that simulated the effect of live load traffic on composite girder systems. Based on the results of this experimental study, many details that are prevalently used in practice were shown to exhibit poor fatigue characteristics due to (1) the presence of localized stress concentrations near welds and/or (2) significant bending stresses not explicitly considered in analysis and design. Conversely, the proposed details mitigated these effects and were subsequently found to improve the fatigue life of cross-frame systems.
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来源期刊
Journal of Bridge Engineering
Journal of Bridge Engineering 工程技术-工程:土木
CiteScore
6.30
自引率
5.60%
发文量
166
审稿时长
6 months
期刊介绍: The Journal of Bridge Engineering publishes papers about all aspects of the art and science of bridge engineering. The journal publishes research that advances the practice and profession of bridge engineering and papers about issues, projects, materials, design, fabrication, construction, inspection, evaluation, safety, performance, management, retrofitting, rehabilitation, repair, and demolition.
期刊最新文献
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