中美规范桥墩局部冲刷深度计算的比较研究  

Comparative Study Between Chinese Code and US Code on Calculation of Local Scour Depth Around Bridge Piers

作　　者：祝志文[1] 喻鹏[1] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《中国公路学报》2016年第1期36-43,共8页China Journal of Highway and Transport

基　　金：国家重点基础研究发展计划("九七三"计划)项目(2015CB057701;2015CB057702);国家自然科学基金项目(51278191);湘高校创新平台开放基金项目(13K016)

摘　　要：针对中美桥墩局部冲刷条文的计算公式,考虑公式的量纲一致性原则、水力学含义、变量参数对冲刷深度的影响等因素,进行了中美规范桥墩局部冲刷深度计算的比较研究;同时结合2个实际桥梁工程实例分别开展了桥墩局部冲刷深度计算,并对计算结果进行了对比分析。研究表明:相比美国规范,中国规范的冲刷计算公式在量纲一致性、水力学含义、冲刷影响参数的确定等方面存在一定不足,表现出较强的经验性,不能考虑漂流物聚集对桥墩局部冲刷的影响,在计算实际桥墩局部冲刷深度时,计算结果偏小;美国规范概念明确,参数少,简化了冲刷计算,便于工程设计采用。Aimed at Chinese and US calculation formulas of local scour depth around bridge piers,considering the influences of dimensional consistency principle,hydraulics meaning and variable parameters on scour depth,a comparative study between Chinese code and US code on calculation of local scour depth around bridge piers was conducted.Meanwhile,two real bridge piers were selected to calculate local scour depth around bridge piers and calculation results were compared.The results show that compared with US code,Chinese code on scour calculation shows strong empirical and some deficiencies on dimensional consistency,hydraulics meaning and parameters of scour influence,and does not consider the effect of accumulation floating debris on local scour around bridge piers.Moreover,when calculationg local scour depth around real bridge piers,the calculation results are smaller.US code simplifies scour calculation with fewer variables and clear scour concept,which helps to be easily adopted in engineering application.

关 键 词：桥梁工程 桥墩 理论分析 局部冲刷 中国规范 美国规范 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]