摘要
高寒地区河冰撞击河道的闸墩结构会产生极端冰载荷和冰激振动,水的动力效应使得碰撞过程更加复杂。采用任意拉格朗日-欧拉流固耦合方法,考虑作用在流冰和闸墩表面的流体力,建立了水-冰-闸墩耦合模型,探究了偶然极端条件下冰-闸墩碰撞的力学特性,设计了冰-砼碰撞实验。结果表明:冰-砼碰撞实验中,撞击力的模拟结果与实验结果吻合良好;对流固耦合的水动力效应分析发现,水-冰-闸墩耦合模型能够体现水的流体特性,在流冰撞击闸墩近场逼近过程中,初始时刻水的动力效应能够增加流冰的动能,撞击楔入闸墩过程中,水介质形成一个瞬态高压力场,产生水垫效应吸收冰体部分动能,从而抑制流冰运动;在不同流冰体积和压缩强度工况下,闸墩结构所承受的冰力随着流冰体积的增大而增大,流冰压缩强度对冰力的影响较小,流冰损伤与闸墩结构响应主要集中在碰撞接触区,流冰撞击闸墩结构引起冰激振动,流冰体积对闸墩振动加速度的影响较大,相同体积的流冰随着压缩强度的增大,振动幅值差异不明显,表明流冰体积是影响冰-闸墩碰撞的关键参数。
In frigid regions,the construction of sluice pier structures within river systems is confronted with considerable challenges arising from the presence of severe ice loads and ice-induced vibrations.The collision process between ice and sluice piers is further complicated due to the intricate hydrodynamic effects exerted by water.The arbitrary Lagrangian-Eulerian(ALE)fluid-structure interaction(FSI)method is employed in this research to meticulously account for the fluid forces acting upon both the ice and sluice pier surfaces.A comprehensive coupled model encompassing the interactions among water,ice,and sluice piers is established to thoroughly investigate the mechanical characteristics associated with ice-sluice pier collisions under highly unpredictable conditions.Corresponding ice-concrete collision tests are meticulously designed and conducted,revealing an exemplary concurrence between the simulated impact forces and the values obtained from experimental observations.Upon analyzing the fluid-structure interaction and hydrodynamic effects,the present study demonstrates that the water-ice-sluice pier coupled model adeptly captures the fluid characteristics inherent to water.During the approach of an ice mass towards a sluice pier,the initial hydrodynamic effects initiated by the water medium effectively augment the kinetic energy possessed by the ice.As the ice forcefully interacts with the sluice pier,the water medium swiftly generates a transient high-pressure field,thereby establishing a phenomenon colloquially referred to as the water cushion effect.This effect is manifested by absorbing a portion of the ice’s kinetic energy,effectively dampening its movement.Distinctive scenarios characterized by varying ice volumes and compression strengths elucidate that the ice forces exerted upon the sluice pier structure directly correlate with the magnitude of the ice volume,while the influence of ice compression strength on said forces is relatively negligible.The consequential damages inflicted upon the ice and
作者
杨腾腾
贡力
董洲全
杜云飞
崔越
YANG Tengteng;GONG Li;DONG Zhouquan;DU Yunfei;CUI Yue(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,Gansu,China)
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
2023年第12期54-67,共14页
Explosion and Shock Waves
基金
国家自然科学基金(51969011)
甘肃省科技计划资助项目(21JR7RA301)
甘肃省黄河水环境重点实验室开放基金(21YRWEK003)
甘肃省教育厅优秀研究生“创新之星”项目(2023CXZX-600)。
关键词
流固耦合
水动力
闸墩
撞击力
冰激振动
fluid-structure interaction
hydrodynamic
sluice pier
collision forces
ice-induced vibration