Numerical Simulation Of Ship Collision With Large Span Cable-Stayed Bridge And Performance Analysis Of Anti-Collision Facility

Ship-bridge collision safety problem is one of the important topics in bridge safety field. Nowadays, more and more researchers use numerical analysis method to study the problem. The paper mainly discusses the security of a large cable-stayed bridge is located in Anhui Province from four aspects:numerical simulation of ship bridge collision, influencing factors of collision progress, collision force calculation codes at home and abroad, anti-collision facility for bridge.The first and the second chapters includes the background information and numerical calculation theory.the third chapter establishes nonlinear dynamic calculation models of whole ship, whole bridge and anti-collision facility. In the fourth chapter, ship-bridge collisions are calculated when the bridge is not protected by anti-collision facility, some variable factors are discussed. The fifth chapter calculates ship-bridge collision when the bridge is protected by anti-collision facility. The chapter six properly summaries and concludes several related deficiencies and prospects of further work. Here are the conclusions:When the bridge is not protected by anti-collision facility:1. Bridge tower could easily endure the ship’s collision, but the concrete of bridge tower will suffer serious damage.2. It is suitable to simplify the bridge tower as rigid body when head-on collision is calculated, but it’s not suitable for 45° collision.3. The type of collision ship bow affects collision process.4. The thickness of ship bow shell element is remarkable effect on the collision forces and crush depth head-on collision, but little on the 45° collision.5. Different collision water levels may lead to different contacts between ship and bridge tower, thus affect the collision progress.6. Collision force has linear relationship with collision speed, and collision progress duration is less affected by collision speed.7. Collision force has linear relationship with the square root of collision ship tonnage, duration of collision increases as the tonnage increases.8. With the increase of collision angle, collision force decreases and duration of collision increases.9. For ships over 10000 DWT with bridge collision in this paper, the AASHTO code or the European ocean code is recommended to calculate the collision force of ship-bridge collision.When the bridge is protected by anti-collision facility:1. Even though in extreme case, FRP anti-collision pontoon could commendably dissipate the kinetic energy of collision ship, protect the structural safety of bridge tower and collision ship, but the pontoon will suffer serious damage.2. In each ship bridge collision with different collision speeds or different angles, the installation of FRP anti-collision pontoon could reduce half of the corresponding collision force peak value and double the corresponding duration of collision.