春季河冰流凌对桥墩撞击作用计算模型的研究

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振动与冲击 ›› 2011, Vol. 30 ›› Issue (6) : 192-195.

论文

春季河冰流凌对桥墩撞击作用计算模型的研究

于天来1,2;单思镝2;雷俊卿1;张元2;袁正国2

作者信息 +

Research on Calculation Model of Impact Effect of River Ice on Pier

YU Tian-lai1,2 ;SHAN Si-di2 ;LEI Junqing1;ZHANG Li-yuan2

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文章历史 +

摘要

采用LS-DYNA显示动力分析软件就流冰对桥墩撞击力的计算机仿真模型进行了研究。提出了河冰的简化本构关系模型；建立了桥墩与流冰接触撞击的有限元分析模型。探讨了接触类型与算法、冰排网格密度、接触区域桥墩网格密度对桥墩撞击力计算结果的影响，并与实测结果进行了对比。得出如下结论：流冰及接触区域的桥墩可采用solid164单元；河冰材料可采用线弹性模型，最大拉应力失效准则；ASTS自动面面接触类型及对称罚函数接触算法就流冰对桥墩撞击力模型是适合的；与桥墩接触的近区冰排单元大小及接触区域桥墩网格密度对撞击力均有较大影响，应注意单元尺寸的合理选择。研究结果为流冰对桥墩撞击力的计算提供了新的方法，对完善流冰撞击力的计算方法具有理论价值及现实意义

Abstract

Adopting the explicit dynamical analysis software package LS-DYNA, the calculation model of collision effect between river ice and pier is studied. The simplified constitutive relation of river ice is proposed, and the finite element analysis model of contact-impact effect of ricer ice on pier is established. Effects of contact type and arithmetic, mesh density of ice sheet, mesh density of pier in contact area are discussed, and the calculation results on impact force are compared with the measured ones. The conclusions can be drawn as follow: It is feasible that solid164 element is adopted for floating ice elements and the pier elements in contact area. Linear elastic material model as well as failure criteria of the maximum flexural-tensile stress can be apt for river ice impact analysis. The automatic surface to surface contact type and the symmetrical penalty function algorithms are appropriate for the calculation model of impact force of river ice. The collision force will be largely influenced by element size of ice drifting located at a distance near the contact area and the mesh density of the pier in contact area have more influence on the collision force, so it is important to rationally choose the element size. A new method for the collision force analysis between river ice and pier has been provided and it is very important in theory and practice to improve calculation method of collision force between river ice and pier

导出引用

于天来;单思镝;雷俊卿;张元;袁正国. 春季河冰流凌对桥墩撞击作用计算模型的研究[J]. 振动与冲击, 2011, 30(6): 192-195

YU Tian-lai;;SHAN Si-di;LEI Junqing;ZHANG Li-yuan. Research on Calculation Model of Impact Effect of River Ice on Pier[J]. Journal of Vibration and Shock, 2011, 30(6): 192-195