结构形式对桥墩局部冲刷三维性态发展的影响

发布时间：2018-01-04 15:15

本文关键词：结构形式对桥墩局部冲刷三维性态发展的影响　出处：《东南大学学报(自然科学版)》2014年01期 　论文类型：期刊论文

【摘要】：选用基于动网格自更新技术的三维CFD冲刷模型,可以解决既有一维、二维计算研究方法的局限性以及准确性问题,对桥墩冲刷以及周边流场三维性态进行全过程动态跟踪分析.首先采用经典B.W.Melville实验环境以及实验数据,分别从流场、流速以及冲刷坑进行冲刷模型的准确性验证.进而利用该数值模型分别对3种典型桥墩(单柱墩、双柱墩、排墩)周边河床的冲刷深度、冲刷坑形态以及冲刷影响区域进行数值分析,通过数据分析得出各自完全不同的冲刷发展趋势与性态特征.通过对比分析可以看出,桥墩结构形式对桥墩局部冲刷三维性态发展有着显著影响,区分桥墩结构形式对桥墩冲刷设计、理论分析以及长期监测方案设置具有相当的必要性与重要性.
[Abstract]:The 3D CFD scour model based on dynamic mesh self-updating technology can solve the limitation and accuracy of the existing one-dimensional and two-dimensional computational methods. The 3D behavior of the bridge pier scour and the surrounding flow field is analyzed by dynamic tracking. Firstly, the classical B.W. Melville experimental environment and experimental data are used to analyze the flow field. The accuracy of the scour model is verified by the flow velocity and the scour pit. Then, the scour depth of the riverbed around the three typical bridge piers (single column pier, double column pier, row pier) is verified by the numerical model. Through the numerical analysis of scour pit shape and scour affected area, the development trend and characteristics of scour behavior are obtained by data analysis, which can be seen by comparison and analysis. The structure form of piers has a significant influence on the development of local scour behavior of piers. It is necessary and important to distinguish the structure form of piers for the design, theoretical analysis and long-term monitoring of pier scour design.
【作者单位】：东南大学交通学院;
【基金】：国家自然科学基金资助项目(51208097) 高等学校博士学科点专项科研基金资助项目(20120092120058) 江苏省自然科学基金资助项目(BK2012343)
【分类号】：U442.3
【正文快照】： 基础结构的冲刷病害是当今桥梁结构功能失效、丧失其安全性能的最主要原因之一.以美国为例,从1966年至2005年,全美倒塌桥梁(1 502座)中58%的破坏桥梁与桥梁基础结构的冲刷病害有关,美国交通部已将桥梁基础冲刷看作是高速公路桥梁结构功能及安全性能失效的最常见原因之一[1-3].

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