engleski

Vehicle-structure interaction analysis with modified finite strip method

Moving loading problem comprises modeling and analysis of some stationary structure and moving vehicle or any other moving structure (crane, pantograph, rotating discs etc.), as well as studying their interaction. Three segments of this problem can be distinguished: moving load modeling, structure modeling and coupling of these two models for interaction. Therefore this problem is very complex and difficult to solve. Vehicle-structure interaction is generally nonlinear problem and involves simultaneous solving of couple of systems of differential equations [1], which requires application of some numerical techniques. Finite element method (FEM), which is the most representative in engineering because of its versatility, is not appropriate for moving loading problem for many reasons (bulky system matrices, determination which of the elements is loaded in every time step, extremely computer and time demanding). Many researchers avoided this problem using significant reduction in degrees of freedom of structure or loading system, often even both. This extensive model simplification raises the question, whether such analysis gives realistic and objective insight into vehicle and structure behavior. In this paper different moving loadings in the context of vehicle- structure interaction are analysed. Simply supported plate structure is modeled with flat shell strip elements [2] upgraded to be suitable for moving loading and interaction analysis. Numerical analysis of vehicle- structure interaction is performed to obtain insight and guidelines for structure and vehicle modelling from the aspect of realiability of structure. Presented numerical model, owing to modified flat strip called vehicle strip element, enables realistic (3D) modeling of both vehicle and structure as well as deep insight in the interaction mechanism between them. Plate structure is chosen here to compare vehicle models, although presented model upholds more complicated structures. It is shown that full vehicle model gives the best agreement with measured data, and is better for complete interaction modelling, since it takes into account all degrees of freedom of the vehicle.

vehicle-structure interaction; finite strip method; vehicle strip element; moving loading

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