考虑双向流固耦合的受泥流冲刷桥墩力学性能分析  

Analysis of Mechanical Properties of Silt Washed Pier Considering Two-Way Fluid-Structure Coupling

作　　者：张伟喜[1,2] 闫长斌[3] ZHANG Weixi;YAN Changbin(School of Civil Engineering,Jiujiang Vocational University,Jiujiang 332000,China;Institute of Seismic Engineering of Hydraulic Engineering,Zhengzhou University,Zhengzhou 450001,China;School of Civil Engineering,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]九江职业大学建筑工程学院,江西九江332000 [2]郑州大学水工抗震研究所,河南郑州450001 [3]郑州大学土木工程学院,河南郑州450001

出　　处：《人民黄河》2024年第10期158-162,共5页Yellow River

基　　金：国家自然科学基金资助项目(52079128)。

摘　　要：基于双向流固耦合理论和湍流理论,建立泥流冲击桥墩数值分析模型,并采用文献试验数据进行了验证。设定了3种不同截面的立柱进行冲刷计算,结果表明圆形截面立柱抗冲刷能力最好,三角形截面立柱导流效果较好。针对圆形截面桥墩进行了4种不同含沙量泥流冲刷工况的数值模拟,结果显示:含沙量越大,立柱被泥流冲刷破坏的可能性越大,与冲击力对比佐证,含沙量越大的泥流对立柱的损伤越强,此外,在一定含沙量范围内,桥墩动力响应会随着泥流含沙量的增大而增大,但超出这一范围,动力响应将骤减。To address the safety issues of bridge structures affected by local scouring from the Yellow River mudflows,this study employod bidirectional fluid-solid coupling theory and turbulence theory to establish a numerical analysis model for sand-laden mudflow impacting bridge piers,which was validated against experimental data from literature.Based on this,calculations were conducted for three different cross-sectional pillars to assess scouring effects.The results indicate that circular cross-section pillars exhibit better resistance to scouring,making them more suitable for the Yellow River bridge piers,while triangular cross-section pillars demonstrate superior diversion capabilities,rendering them more suitable for abutments.Building upon this,numerical simulations were conducted for circular cross-section bridge piers under four different sediment concentrations.Comparative analysis reveals that as sediment concentration increases,the likelihood of pier scouring by mudflows increases,corroborated by comparisons with impact forces.Moreover,within a certain range of sediment concentrations,the dynamic response of bridge piers increases with sediment concentration;however,beyond this range,the dynamic response sharply declines.

关 键 词：桥墩 局部冲刷 流固耦合 力学性能 

分 类 号：TU528[建筑科学—建筑技术科学]