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西南交通大学土木工程学院桥梁工程系,四川 成都 610031
Received:09 December 2018,
Revised:2019-03-22,
Published:15 December 2020
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沈忠辉,魏凯,杨绍林.孤立波作用下不同长宽比圆端形桥墩受力数值分析[J].防灾减灾工程学报,2020,40(06):945-951.
SHEN Zhonghui,WEI Kai,YANG Shaolin.Numerical Analysis of Solitary Wave Loading on Round⁃ended Piers with Different Length⁃width Ratios[J].Journal of Disaster Prevention and Mitigation Engineering,2020,40(06):945-951.
沈忠辉,魏凯,杨绍林.孤立波作用下不同长宽比圆端形桥墩受力数值分析[J].防灾减灾工程学报,2020,40(06):945-951. DOI: 10.13409/j.cnki.jdpme.2020.06.013.
SHEN Zhonghui,WEI Kai,YANG Shaolin.Numerical Analysis of Solitary Wave Loading on Round⁃ended Piers with Different Length⁃width Ratios[J].Journal of Disaster Prevention and Mitigation Engineering,2020,40(06):945-951. DOI: 10.13409/j.cnki.jdpme.2020.06.013.
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 railway bridges, a numerical wave tank (NWT) was built by adopting the wave inlet boundary via CFD numerical software. The RANS equation of the NWT was solved including k-ω turbulence model. Solitary wave was generated to simulate the extreme wave. The developed NWT was validated with the theoretical 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, water 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 particle 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.
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