Study On The Navigable Dimension Of Tianjin Haihe River

China's national economy and traffic transportation industry's rapid development, promoted the bridge construction, large cross river, cross sea bridge built and put into use or are planning the construction of. The bridge was built, convenient transportation, promoting regional economic development, but also for ship navigation and water transport caused by the influence of different degree, some bridges and even facing severe vessel collision risk. Especially some cross Bay Bridge, to face the 10000-ton ship collision. In the collision and impact resistance of choice, and impact is more economic and reasonable safety measures.As a result of ship bridge collision process are affected by many factors, involving the structure object product, difficult to measure, can simulate the characteristics, research is very difficult. In our country the ship bridge collision number increases ceaselessly, ceaseless construction of super long span bridges, ship bridge collision risk is more and more big situation, carry out the related research is very necessary.This paper synthesizes the domestic and foreign scholars on the ship-against-bridges problems research results, elicitation study ship-bridge collision and the importance of bridge pier protective facilities. Based on the review of anti-collision device, summarizes the various limitations, and put forward to get used to contemporary design demand three not bad crash thought; the ship bridge collision related with various factors were analyzed and classified, establishing multi level decision model, using the fuzzy decision making method to ship bridge collision design decision, on the factors affecting the quantitative index of ship collision with bridge design, undertook objective analysis and decision making, as the ship bridge collision design decision provides a scientific research approach; at the same time the ship bridge collision mechanics analysis of issues, on the hit force is commonly used at home and abroad were studied and deduced the formula, and the use of computer finite element simulation calculation for calculating results are verified, the results demonstrate both the reliability of ship collision with the pier; through several case undertakes an analysis, put forward the calculation method of lateral collision force, at the same time on the pier fortification energy selection is proposed; finally from the economic and technique discussed in the island and other conservative anticollision measures cannot carry out case, flexible energy-absorbing anti-collision device is to solve large bridge and large tonnage ship impact problem the best way, and the flexible energy-absorbing anti-collision device The design of the production process are analyzed, on the Zhanjiang Bay Bridge flexible energy-absorbing anti-collision facilities optimized design, use of computer finite element simulation is validated, verified the flexible energy-absorbing anti-collision facilities to achieve" small bump is not bad, in the hit the repairable, big hit fail" grade three collision concept, and in practice prove flexible energy-absorbing anti-collision device practical value in engineering.This article through to the pier on the ship collision, collision facilities design decisions, impact force and energy calculation and flexible energy-absorbing anti-collision facilities were studied, we hope to bridge construction and design work play a certain reference role.