A reappraisal of bridge piers scour vulnerability: a case study in the Upper Tiber River basin (central Italy)
A reappraisal of bridge piers scour vulnerability: a case study in the Upper Tiber River basin (central Italy)
复制标题
桥墩冲刷脆弱性的重新评估：台伯河流域上游（意大利中部）的案例研究
DOI：
--
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
T. Moramarco
中科院分区：
文献类型：
--
作者：
S. Barbetta;S. Camici;T. Moramarco
通过比较两种程序来解决桥墩易受冲刷的问题。第一种方法量化冲刷脆弱性指数（SVI），考虑局部冲刷和收缩冲刷的综合影响。该方法要求通过检查活动对选定案例研究的比例因子进行量化，以考虑经验公式提供的冲刷深度高估。第二种方法根据几个指标确定垂直不稳定性的脆弱性指数。这项研究以意大利中部台伯河流域的 46 座桥梁为样本进行，结果表明，两种方法识别出了相同数量的受“高”脆弱性影响的桥墩。检查结果对结果进行了补充，检查结果通过比例因子确定了测量的冲刷深度和 SVI 值之间的高度相关性。 SVI 更简单、最实用，对于快速估计大面积的冲刷脆弱性似乎很有用，决策者可以采用它来识别在维护和控制方面需要注意的结构。所提出的结果并未提供正确估计冲刷的一般规则。它们仅涉及调查的案例研究，需要在其他河流背景下进行验证。
The issue of bridge piers vulnerability to scour is addressed by comparing two procedures. The first method quantifies the Scour Vulnerability Index (SVI) considering the combined effects of local and contraction scour. The method requires that a scale factor, for taking account of the scour depth overestimation provided by empirical formulae, is quantified for the selected case study through inspection campaigns. The second approach identifies a vulnerability index to vertical instability depending on several indicators. The study is carried out for a sample of 46 bridges in the Tiber River basin, central Italy, and shows that the two methods identify the same number of piers affected by ‘high’ vulnerability. Results are supplemented by outcomes of inspections that identified, through the scale factor, a high correlation between measured scour depth and SVI value. SVI, simpler and most practical, seems useful for an expeditious estimate of scour vulnerability in large areas and can be adopted by decision makers to identify the structures requiring attention in terms of maintenance and control. The presented results do not provide a general rule for a correct estimate of scour. They refer to solely the investigated case study and need to be verified in other rivers context.