船舶撞击荷载作用下高桩墩的破坏分析
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摘要
提出了以动量守恒定律为基础,试算输入不同简化撞击力-时间荷载曲线,计算结构的动力响应与现场检测结果一致为准则,基于有限元模型分析船撞结构损伤破坏的数值分析方法。以中泉石化船撞高桩系缆墩事故为背景,运用通用有限元显示动力分析软件LS-DYNA,建立了高桩系缆墩的三维有限元模型,采用所提出的方法计算分析了受撞系缆墩的破坏过程。数值分析结果表明,当撞击时间为13.75 s时,系缆墩残余位移与现场检测结果一致,系缆墩在船舶撞击作用下墩台发生剪切破坏的现象与事故现场相符;同时数值模拟结果表明系缆墩灌注桩混凝土在嵌岩端上部发生不同程度破坏,钢套筒进入屈服阶段;对系缆墩结构整体进行损伤等级评估,属于中等破坏。
A new method for the numerical analysis of structures is proposed, based on momentum conservation laws to calculate the dynamic responses of the sutructre with different input simplified force-time curves using finite element model, and it stops until the numerical result is consistent with the actual value. Based on the background of the "Zhong Quan" Sinopec accident, a three dimensional model of high-pile cleat is eatablished with explicit dynamic analytical software LS-DYNA, and the failure process of the cleat under ship's impact load is analyzed by the proposed method. The results show that the residual displacements of the cleat are consistent with the actual values when the impact time is 13.75 s, and the shear failure mode of the abutment is consistent with the situation. Also, they show that the concrete of the filling piles is damaged in various degrees at the fixed end, the steel sleeves enter the yield stage, and the cleat is evaluated as medium damage.
A new method for the numerical analysis of structures is proposed, based on momentum conservation laws to calculate the dynamic responses of the sutructre with different input simplified force-time curves using finite element model, and it stops until the numerical result is consistent with the actual value. Based on the background of the "Zhong Quan" Sinopec accident, a three dimensional model of high-pile cleat is eatablished with explicit dynamic analytical software LS-DYNA, and the failure process of the cleat under ship's impact load is analyzed by the proposed method. The results show that the residual displacements of the cleat are consistent with the actual values when the impact time is 13.75 s, and the shear failure mode of the abutment is consistent with the situation. Also, they show that the concrete of the filling piles is damaged in various degrees at the fixed end, the steel sleeves enter the yield stage, and the cleat is evaluated as medium damage.
引文
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[8] 陈宇,孙熙平,李越松.施工期台风浪作用下沉箱碰撞破坏分析[J].水利水运工程学报,2018(4):112-118.(CHEN Yu,SUN Xiping,LI Yuesong.Pounding damage analysis of caissons during construction under action of storm wave[J].Hydro-Science and Engineering,2018(4):112-118.(in Chinese))
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[10] LI Z X,CHEN Y,SHI Y D.Seismic damage control of nonlinear continuous reinforced concrete bridges under extreme earthquakes using MR dampers[J].Soil Dynamics and Earthquake Engineering,2016,88:386-398.
[2] MANUEL L,KALLIVOKAS L F,WILLIAMSON E B,et al.A probabilistic analysis of the frequency of bridge collapses due to vessel impact[J].Bridge Design,2006.
[3] 王君杰,卜令涛,孟德巍.船桥碰撞简化动力分析方法:简化动力模型[J].计算机辅助工程,2011,20(1):70-75.(WANG Junjie,BU Lingtao,MENG Dewei.Simplified dynamic analysis method of ship-bridge collision:simplified models[J].Computer Aided Engineering,2011,20(1):70-75.(in Chinese))
[4] 欧碧峰.基于微平面模型的桥梁船撞数值模拟与简化动力分析[D].上海:同济大学,2008.(OU Bifeng.The ship-pounding numerical simulation and simplified dynamic analysis of bridges based on the micro-plane model[D].Shanghai:Tongji University,2008.(in Chinese))
[5] SHA Y,HAO H.Laboratory tests and numerical simulations of barge impact on circular reinforced concrete piers[J].Engineering Structures,2013,46(1):593-605.
[6] LS-DYNA.LS-DYNA user manual[M].Livermore Software Technology Corporation,2007.
[7] 田力,黄飞.考虑流体效应的船-桥碰撞数值模拟法研究[J].工程力学,2015,32(8):120-128.(TIAN Li,HUANG Fei.Numerical simulation method for ship-bridge collision considering fluid effect[J].Engineering Mechanics,2015,32(8):120-128.(in Chinese))
[8] 陈宇,孙熙平,李越松.施工期台风浪作用下沉箱碰撞破坏分析[J].水利水运工程学报,2018(4):112-118.(CHEN Yu,SUN Xiping,LI Yuesong.Pounding damage analysis of caissons during construction under action of storm wave[J].Hydro-Science and Engineering,2018(4):112-118.(in Chinese))
[9] SHARIFI A,BANAN M R,BANAN M R.A strain-consistent approach for determination of bounds of ductility damage index for different performance levels for seismic design of RC frame members[J].Engineering Structures,2012,37(4):143-151.
[10] LI Z X,CHEN Y,SHI Y D.Seismic damage control of nonlinear continuous reinforced concrete bridges under extreme earthquakes using MR dampers[J].Soil Dynamics and Earthquake Engineering,2016,88:386-398.