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Impact mitigation measures for bridges under extreme flood actions
Journal of Fluids and Structures ( IF 3.6 ) Pub Date : 2021-09-04 , DOI: 10.1016/j.jfluidstructs.2021.103381
F. Greco 1 , P. Lonetti 1 , P. Nevone Blasi 1
Affiliation  

Coastal or inland bridges are affected by severe loading scenarios due to extreme flood or tsunami actions. A complete identification of the damage phenomena in infrastructure systems requires an accurate description of the fluid and structural characteristics and, specifically, of their coupling effects. In the present study, a numerical model based on a multiscale approach is developed. The structure is modeled by a 3D solid formulation, whereas the fluid domain is based on the 2D the Reynolds-averaged Navier–Stokes equations. Particular attention is devoted to the implementation of proper transfer functions going from 2D to 3D and vice versa, which take into account fluid–structure interaction, expressed in terms of bridge deformability and moving wall conditions. Several loading and wave scenarios are investigated in terms of typical fluid and structural flood parameters. The main purpose of the present study is to quantify dynamic amplification effects on the basis of formulations proposed by existing codes based on equivalent static analyses. In addition, protection or mitigation measures applied to the structural system are discussed to identify the geometry of the fairing system, which is able to reduce the effects of the wave loads in terms of applied hydraulic forces on the structure, bridge deformability and effects of damage scenarios.



中文翻译:

极端洪水作用下桥梁减灾措施

由于极端洪水或海啸的作用,沿海或内陆桥梁会受到严重负载情况的影响。完整识别基础设施系统中的损坏现象需要准确描述流体和结构特征,特别是它们的耦合效应。在本研究中,开发了基于多尺度方法的数值模型。结构由 3D 固体公式建模,而流体域基于 2D 雷诺平均 Navier-Stokes 方程。特别注意实现从 2D 到 3D 的正确传递函数,反之亦然,它考虑了流固耦合,以桥梁变形能力和移动墙条件表示。根据典型的流体和结构洪水参数研究了几种载荷和波浪情景。本研究的主要目的是在基于等效静态分析的现有代码提出的公式的基础上量化动态放大效应。此外,讨论了应用于结构系统的保护或缓解措施,以确定整流罩系统的几何形状,这能够减少波浪载荷对结构施加的水压力、桥梁变形能力和损坏影响的影响场景。

更新日期:2021-09-04
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