[1]齐洪亮,袁天刚,田伟平,等.顺直河道双桥墩纵向桥段流场过剩切应力特征数值模拟[J].长安大学学报(自然科学版),2021,41(4):32-42.
 QI Hong liang,YUAN Tian gang,TIAN Wei ping,et al.Modeling of excess shear stress around two columns of tandempiers of longitudinal bridge[J].Journal of Chang’an University (Natural Science Edition),2021,41(4):32-42.
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顺直河道双桥墩纵向桥段流场过剩切应力特征数值模拟()
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长安大学学报(自然科学版)[ISSN:1006-6977/CN:61-1281/TN]

卷:
第41卷
期数:
2021年4期
页码:
32-42
栏目:
桥梁与隧道工程
出版日期:
2021-07-15

文章信息/Info

Title:
Modeling of excess shear stress around two columns of tandempiers of longitudinal bridge
作者:
齐洪亮袁天刚田伟平张晨光
(长安大学 特殊地区公路工程教育部重点实验室,陕西 西安 710064)
Author(s):
QI Hongliang YUAN Tiangang TIAN Weiping ZHANG Chenguang
(Key Laboratory for Special Area Highway Engineering of Ministry of Education,Changan University, Xian 710064, Shaanxi, China)
关键词:
桥梁工程双桥墩纵向桥过剩切应力顺直河道数值模拟CFD
Keywords:
bridge engineering two columns of tandem piers excess shear stress longitudinal bridge numerical simulation computational fluid dynamics
文献标志码:
A
摘要:
为了揭示纵向桥墩跨径对河床附近过剩切应力特征的影响机理及规律,利用FLOW3D软件,参考西汉(西安—汉中)高速公路纵向桥墩设计方案,采用定床方式对顺直河道双桥墩纵向桥段河床附近的过剩切应力进行了数值模拟,分析圆形桥墩直径对下游涡街影响范围长度的影响规律。以直径为0.04 m的圆柱桥墩模型为例,分析纵向桥跨径对河床附近水平面过剩切应力、各桥墩横断面过剩切应力及桥墩附近最大过剩切应力的影响,提出了显著影响河床附近过剩切应力的临界跨径及跨径对其影响规律。研究结果表明:当桥墩跨径小于28.5D (D为桥墩模型的直径)时,Kármán涡街的叠加效应对过剩切应力影响显著,且越靠近下游,影响越大;不同桥墩跨径时,各排桥墩横断面位置处,桥墩周围的过剩切应力与第1排桥墩横断面的过剩切应力相比,均有所降低,最大降幅达50%,靠近河岸区域的过剩切应力均有所增大,最大增幅达54%;桥墩跨径越小,各桥墩断面切应力值变化幅度越大,不同桥墩跨径时,第1排桥墩附近的最大过剩切应力值比较接近,最大过剩切应力系数约为0.95,且受跨径影响不大;桥墩跨径越小,纵向桥墩的遮蔽作用越明显,当桥墩跨径小于28.5D时,前3排桥墩附近的最大过剩切应力系数由0.95迅速降低至0.58,最终稳定于0.5左右;当桥墩跨径大于28.5D时,前2排桥墩附近最大过剩切应力系数由0.95迅速降低至0.72,最终稳定于0.7左右。
Abstract:
To reveal the mechanism of the influence of the longitudinal bridge pier span on the characteristics of the excess shear stress near the riverbed, FLOW3D was used to simulate the excess shear stress near the river bed with a fixed bedload and two columns of tandem piers in the straight river, based on the design of pier of the Xihan (Xian to Hanzhong) Highway. The influence of the diameter of cylindrical pier on the length of the downstream caused by vortex street was analyzed. The influence of the span on the excess shear stress characteristics of the horizontal plane near the river bed, the excess shear stress characteristics of each crosssection at the center of the bridge pier, and the maximum excess shear stress characteristics near the bridge piers were analyzed. The critical span that significantly affects the characteristics of the excess shear stress near the river bed was proposed. The results show that when the pier span is shorter than 28.5D (D is the diameter of the pier in the model), the accumulative effect of the Kármán vortex street has a significant impact on the characteristics of the excess shear stress. The closer the location to the downstream is, the more obvious the influence is. Compared with the crosssection of the first row in each model, the excess shear stress around other crosssections reduce up to 50%, and the excess shear stress between the piers and the river bank increases up to 54%. In different models, the coefficient of the maximum excess shear stress of the first row of piers is about 0.95, and it is not affected by the span of the models. The shorter the span is, the more obvious the shielding effect of the tandem pier is. When the span is short than 28.5D, the coefficient of the maximum excess shear stress of the first three rows decreases rapidly from 0.95 to 0.58, and finally stabilizes at about 0.5. When it is longer than 28.5D, the coefficient of the maximum excess shear stress of the first two rows of piers decreases rapidly from 0.95 to 0.72, and finally stabilizes at about 0.7. 2 tabs, 10 figs, 33 refs.

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更新日期/Last Update: 2021-08-12