Analysis On Anti-collision Of Polyurethane-Steel Sandwich Plate System For Bridge Pier

Polyurethane-steel sandwich plate system is composed of two steel face plates and polyurethane core layer, the elastomer core material and the face plate surface to form a strong adhesive composite structure. Nowadays this structure has been using for the bridge deck in foreign countries. Polyurethane-steel sandwich Plate has been widely used for helicopter apron, highway crash barriers, the replacement and reinforcement of bridge deck and so on overseas. The capabilities of good impact resistance, pressure-resisting, durability is constantly being proved in the construction field. However, the Polyurethane-steel sandwich Plate has not yet been applied to the domestic bridge engineering without corresponding design standards and guidelines. On the other hand, the rapid development of transportation in our country expands the number of Long Span Bridges. The disastrous incidents of the ship hitting the pier is more frequent, which caused the loss of life and property, environmental damage is getting worse. Therefore, the mechanism of Ship-Bridge Collision, particularly the study of Pier protection device has received considerable attention in recent years.In this background, the paper base on the combination of polyurethane-steel structure and the study of Pier protection device and make full use of this new complex structure capabilities of good impact resistance, pressure-resisting, durability in the design process. Based on finite element calculations, the paper focus on the Research on the basic mechanical behavior of Polyurethane-steel sandwich Plate and further reveal the characteristics of polyurethane-steel structural to provide a reliable basis for the application of the Polyurethane-steel sandwich construction technology in China.Firstly, the research background is setted in this paper, the study of bridge crash-proof facility and Polyurethane steel sandwich structure-material is concluded and applied.Secondly, the mechanics theory of ship-bridge collision is assimilated in this paper, the key technology of numerical simulation is analyzed and discussed, this paper mainly focuses on explicit finite element method of the basic control equations,Finite element discrete equations and the control of frictional contact.Finally, this article mainly around using the method of protective shell model to discuss two mainly questions of collision mechanism and energy absorption mechanism when the ship impact to a bridge. Basic on the key techniques of computer simulation of collision studied and discussed, a example of a ship of 100 tons bulk carrier transverse impact of a bridge pier with anti-collision polyurethane plate sandwich structure box was calculated by the use of large scale general FEM software ANSYS/LS DYNA. this software was used to analyze the impact energy absorption characteristics and components of energy dissipation, the effects of different structural styles in the energy absorption was compared and the measures was given to optimizate and improve the structure. At last ,we calculate and analyse the dynamic response of different thickness of polyurethane-steel sandwich structure in the collision process was calculated and analysed, the impact energy absorption effect was compared when the structural rigidity was changed and the improvement in the energy absorption and strong collision resistance of the structure was given.In a word , a kind of new-style structure crash-proof facility was put forward in this article, the Polyurethane steel sandwich structure was introduced to the research of the bridge crash-proof project, have proved that Polyurethane steel sandwich structure was proved to be a good effect of resisting strike by the finite element analysis.