摘要
为研究极端波浪灾害对近海铁路桥墩的水动力作用,基于CFD数值软件进行入口边界造波,结合k⁃ω湍流模型求解RANS方程,采用孤立波模拟极端波浪,建立数值水槽,并利用理论公式验证了数值水槽的可靠性。为探究桥墩长宽比对圆端形桥墩受力的影响,在数值水槽中开展了孤立波作用下不同长宽比(L/D)圆端形桥墩的三维数值模拟,研究了圆端形桥墩长宽比对桥墩周围波浪爬高、流速及桥墩波浪力的影响。研究结果表明:不同长宽比圆端形桥墩最大波压均发生在静水液面位置;桥墩长宽比对波浪爬高、墩周流场影响明显;圆端形桥墩受到的最大波浪力、墩底最大弯矩随着长宽比的增加而增加,当长宽比较小时,二者呈线性关系。
In order to study the hydrodynamic loads of extreme wave hazards on the piers of coastal rail⁃way bridges,a numerical wave tank(NWT)was built by adopting the wave inlet boundary via CFD nu⁃merical software.The RANS equation of the NWT was solved including k-ωturbulence model.Solitary wave was generated to simulate the extreme wave.The developed NWT was validated with the theoret⁃ical formulas.Three-dimensional numerical simulations of round-ended piers with different length-width ratios under solitary wave were carried out in the NWT to study the effect of the length-width ratio on the wave loading on the round-ended piers.The effects of the length-width ratio on the wave run-up,wa⁃ter particle velocity and wave loading on the pier were investigated.The results showed that:1)the maximum wave pressure of the round-ended pier always occurs at the static water level regardless of the length-width ratio of the pier;2)the length-width ratio of the pier affects the wave run-up and water par⁃ticle velocity significantly;and 3)both maximum wave force and base moment of the pier increase with the length-width ratios,and have a linear relationship when the length-width ratio is small.
作者
沈忠辉
魏凯
杨绍林
SHEN Zhonghui;WEI Kai;YANG Shaolin(Department of Bridge Engineering,Southwest Jiaotong University,Chengdu 610031,China)
出处
《防灾减灾工程学报》
CSCD
北大核心
2020年第6期945-951,共7页
Journal of Disaster Prevention and Mitigation Engineering
基金
国家自然科学基金项目(51708455)资助。
关键词
孤立波
长宽比
圆端形桥墩
波浪力
数值水槽
solitary wave
length-width ratio
round-ended pier
wave force
numerical wave tank
