Performance investigation of highway bridge pier columns under the sequential effects of fire followed by vehicle collision and subsequent air blast: A numerical investigation

IF 2.1 4区 工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY
Qusai Alomari, Daniel G Linzell, Chen Fang
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Abstract

Historically, it has been demonstrated that bridges may be vulnerable to fire, and in many circumstances, resulting damage might not be apparent, and bridges could maintain acceptable levels of serviceability. In the absence of proven assessment tools and given the limited research that addresses bridge fire, research that better understands response and strives to improve highway bridge resiliency to fire is needed. Extending the work carried out during an earlier research stage, the present study focused on investigating performance of bridge pier columns that survive fire under coupled vehicle collision and air blast. Numerical models of single reinforced concrete columns supported by a pile foundation system and surrounded by air and soil volumes were created using LS-DYNA. As explicit solvers such as those available in LS-DYNA are infrequently used for fire analysis, an indirect two-step approach that integrated heat transfer and structural analyses was developed and validated against published fire-induced impact and blast test results. A parametric study that examined the effects of various fire exposure conditions and column diameters was completed. Performance was comprehensively assessed based on various structural response parameters, which included failure modes, lateral displacement, residual axial capacities, and shear demand-to-capacity ratios. Column damage was then categorized into six levels to qualitatively assess column performance under the aforementioned multi-hazards. The developed modeling approach was shown to be viable, and results indicated that larger column diameters could potentially remain in service in their final damage states after being repaired for fire durations of less than 120 min.
公路桥梁墩柱在火灾、车辆碰撞和随后的气爆连续作用下的性能研究:数值研究
历史证明,桥梁可能容易受到火灾的影响,在许多情况下,由此造成的损坏可能并不明显,桥梁可以保持可接受的可用性水平。由于缺乏行之有效的评估工具,且针对桥梁火灾的研究有限,因此需要开展研究,以更好地了解应对措施,并努力提高公路桥梁对火灾的适应能力。本研究是在早期研究阶段所开展工作的基础上进行的,重点研究在车辆碰撞和空气爆炸的耦合作用下,桥墩柱在火灾中的性能。使用 LS-DYNA 建立了由桩基系统支撑、周围为空气和土壤体积的单根钢筋混凝土柱的数值模型。由于诸如 LS-DYNA 中可用的显式求解器很少用于火灾分析,因此开发了一种集成热传递和结构分析的间接两步法,并根据已公布的火灾诱发的撞击和爆炸试验结果进行了验证。完成了一项参数研究,考察了各种火灾暴露条件和支柱直径的影响。根据各种结构响应参数,包括破坏模式、横向位移、残余轴向承载力和剪切需求与承载力比率,对性能进行了全面评估。然后将支柱损坏分为六个等级,以定性评估支柱在上述多种灾害下的性能。所开发的建模方法被证明是可行的,结果表明,较大直径的柱子在火灾持续时间小于 120 分钟的情况下,经过修复后有可能在其最终损坏状态下继续使用。
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来源期刊
Advances in Structural Engineering
Advances in Structural Engineering 工程技术-工程:土木
CiteScore
5.00
自引率
11.50%
发文量
230
审稿时长
2.3 months
期刊介绍: Advances in Structural Engineering was established in 1997 and has become one of the major peer-reviewed journals in the field of structural engineering. To better fulfil the mission of the journal, we have recently decided to launch two new features for the journal: (a) invited review papers providing an in-depth exposition of a topic of significant current interest; (b) short papers reporting truly new technologies in structural engineering.
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