Risk-based probabilistic assessment of a bridge collapse due to abutments scour. A case study

IF 4.9 2区 工程技术 Q1 ENGINEERING, CIVIL Transportation Geotechnics Pub Date : 2024-09-23 DOI:10.1016/j.trgeo.2024.101369
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Abstract

Many bridges are constructed over waterways, exposing their support systems to scour caused by flowing water-induced bed shear stresses over time. This study focuses on analysing the local scour beneath an abutment, which led to the collapse of a poorly reinforced concrete bridge in Italy. The analysis investigates the causes of the collapse on the basis of a geotechnical characterisation of the subsoil foundation and mechanics characterisation of the abutment. By estimating the scour amplitude below the abutment, an advanced Finite Element fracture mechanics model was used to study the collapse of the bridge. The study makes it possible to assess the probability of collapse based on the scour width beneath the abutment and offer an approach to assess the safety of infrastructure. Finally, the results show that the empirical model for shear capacity is overly unconservative and sometimes unreliable in this special context. and therefore failure should be predicted from the fracture mechanics based on adopting appropriate reduction factors for shear capacity.
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对桥墩冲刷导致的桥梁坍塌进行基于风险的概率评估。案例研究
许多桥梁都建在水道之上,因此其支撑系统会长期受到水流引起的河床剪应力的冲刷。本研究的重点是分析导致意大利一座钢筋混凝土结构不良桥梁倒塌的桥墩下方的局部冲刷。分析以底土地基的岩土特征和桥墩的力学特征为基础,研究了坍塌的原因。通过估算桥墩下方的冲刷幅度,使用先进的有限元断裂力学模型研究了桥梁的坍塌。这项研究可以根据桥墩下方的冲刷宽度评估坍塌的概率,并提供一种评估基础设施安全性的方法。最后,研究结果表明,在这种特殊情况下,剪切承载力的经验模型过于不严谨,有时甚至不可靠,因此应在采用适当的剪切承载力折减系数的基础上,通过断裂力学来预测坍塌。
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来源期刊
Transportation Geotechnics
Transportation Geotechnics Social Sciences-Transportation
CiteScore
8.10
自引率
11.30%
发文量
194
审稿时长
51 days
期刊介绍: Transportation Geotechnics is a journal dedicated to publishing high-quality, theoretical, and applied papers that cover all facets of geotechnics for transportation infrastructure such as roads, highways, railways, underground railways, airfields, and waterways. The journal places a special emphasis on case studies that present original work relevant to the sustainable construction of transportation infrastructure. The scope of topics it addresses includes the geotechnical properties of geomaterials for sustainable and rational design and construction, the behavior of compacted and stabilized geomaterials, the use of geosynthetics and reinforcement in constructed layers and interlayers, ground improvement and slope stability for transportation infrastructures, compaction technology and management, maintenance technology, the impact of climate, embankments for highways and high-speed trains, transition zones, dredging, underwater geotechnics for infrastructure purposes, and the modeling of multi-layered structures and supporting ground under dynamic and repeated loads.
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