CAJ | 학술논문

文章将“船桥碰撞”与“车桥耦合”联系在一起进行研究,建立了斜拉桥、轻轨和船舶的三维非线性精细有限元模型,研究了轻轨列车-斜拉桥动态耦合系统在船舶碰撞下的动态响应.数值模拟过程分以下四步:桥梁初始成桥状态模拟,轻轨列车—斜拉桥动态耦合模拟,船舶与桥梁的碰撞模拟和桥梁—火车—船舶相互作用模拟.桥梁初始状态及大变形通过更新拉格朗日法和共旋转推导法来实现.通过与平面杆系有限元模型的计算结果进行比较,证实了全三维有限元建模方法在车—桥动态耦合响应分析中应用的准确性.研究通过基于罚函数的动态接触方法来实现车—桥耦合和船舶的碰撞过程,采用递归谱二分法的并行计算技术来缩短计算时间,基于显式中心差分插值法来进行数值求解,该方法证明在分析车—桥—船之间的耦合动态响应是一种有效的技术,为设计阶段模拟桥梁的动态特性提供了有效手段.结果表明,当发生船—桥碰撞时,轻轨列车运行到主桥塔附近行车安全的影响最大.
문장장“선교팽당”여“차교우합”련계재일기진행연구,건립료사랍교、경궤화선박적삼유비선성정세유한원모형,연구료경궤열차-사랍교동태우합계통재선박팽당하적동태향응.수치모의과정분이하사보:교량초시성교상태모의,경궤열차—사랍교동태우합모의,선박여교량적팽당모의화교량—화차—선박상호작용모의.교량초시상태급대변형통과경신랍격랑일법화공선전추도법래실현.통과여평면간계유한원모형적계산결과진행비교,증실료전삼유유한원건모방법재차—교동태우합향응분석중응용적준학성.연구통과기우벌함수적동태접촉방법래실현차—교우합화선박적팽당과정,채용체귀보이분법적병행계산기술래축단계산시간,기우현식중심차분삽치법래진행수치구해,해방법증명재분석차—교—선지간적우합동태향응시일충유효적기술,위설계계단모의교량적동태특성제공료유효수단.결과표명,당발생선—교팽당시,경궤열차운행도주교탑부근행차안전적영향최대.
The work about dynamic simulation of bridge-ship collision and its impact on the moving train is introduced.The three-dimensional (3D) non-linear finite element (FE) model of cable-stayed bridge,light metro and ship is presented.The numerical simulation consists of four steps:simulation of initial bridge state,bridge-train coupling simulation,bridge-ship collision simulation and bridge-train-ship interaction simulation.The initial bridge state and large deformation are fulfilled by using Update Lagrange Formulation and Co-rotational formulation.Validation of the approach and FE models are achieved by comparing the numerical results with the calculation of validated plane bars models.The bridge-train coupling and ship impact are realized through the penalty-based dynamic contact-impact algorithm.Computation time was reduced by parallel domain decomposition with Recursive Coordinate Bisection (RCB) method.Explicit central difference integration is employed in this paper to accomplish the numerical computation.The proposed approaches are proved to be effective to apply in the bridge,train and ship dynamic analysis,and the 3D numerical model can improve the understandings of bridge dynamic behaviors during bridge design.The results show that the ship impact is the most dangerous for train safety when the train is arriving at the main tower.