【摘要】 为了可靠地评估船舶与单墩碰撞的撞击力及墩柱响应,利用ANSYS/LS-DYNA建立了一个详细的船墩碰撞数值模型。船艏采用壳单元模拟外部钢板,梁单元模拟内部桁架,并采用弹塑性材料对船艏钢材进行模拟;对墩柱进行配筋,并采用非线性材料来模拟墩柱混凝土以便真实地反映材料特性,墩顶施加集中质量来模拟上部承重。以内河船舶为例,研究了墩身材料、船舶载重和碰撞速度对船舶撞击力及单墩响应的影响。研究结果表明:假定单墩为刚性或弹性材料得到的撞击力峰值和有效撞击时间均偏大,且碰撞速度越大,其差距越大,混凝土材料的非线性对船墩碰撞模拟结果有较大的影响;增大船舶质量和碰撞速度均使撞击力峰值和碰撞持续时间增加,而船舶撞击速度对撞击力峰值有显著的影响,碰撞持续时间主要取决于船舶载重。更多还原

【Abstract】 To reliably assess the impact force and pier response due to barge impact,a detailed numerical model of barge-pier impact is developed by ANSYS/LS-DYNA.Shell element are utilized to model steel outer plates while internal trusses are modelled by beam elements.The elastic-plastic material model is employed to model the outer shell and internal truss of the barge bow.Reinforce the pier and simulate the concrete with nonlinear materials to more realistically reflect the material properties.A supported mass on pier top which represents the mass from the superstructure is modelled.Taking inland ships as an example,parametric studies are carried out to investigate the effects of pier material,barge masses and impact velocities on impact force and response of single pier.The results demonstrate that the peak impact force and impact time obtained by the rigid and elastic pier assumptions are too large,and the bigger the impact velocity,the bigger the gap.The nonlinearity of concrete materials has a great influence on the simulation of barge impact.Increasing the barge mass and impact velocity can increase the peak impact force and collision duration,while the impact velocity has a significant impact on the peak impact force,and the collision duration depends mainly on the barge mass.更多还原