This paper presents a vessel collision protection system with constant resistance device,which utilizes energy dissipating cables to coordinate with the large deformation of the protected structure and is able to break progressively to offer stable resistance.The constant resistance device consists of the main cables,energy dissipating cables,breaking ring and other connecting components,forming a self-adaptive vessel interception system with constant collision resistance together with the self-adaptive pontoon,interception nets and mooring buoys,to effectively intercept the stray vessels and protect the non-navigable bridge and the culprit vessels.The resistance generating mechanism of the device was theoretically analyzed,and the resistance generation calculation models and methods were proposed,and tensile tests were conducted to verify the efficiency of the calculation methods.And the initial spacing,length and elongation rate of the energy dissipating cables were further discussed.It is shown that the device can effectively provide stable and constant resistance,the smaller the spacing,the bigger and more stable the resistance provided.Length and elongation rates of the energy dissipating cables are also in linear relation with the resistance provided.The device has been applied to the non-navigable bridge of Liyanggang Bridge,effectively protecting the bridge in collision events.
bridge engineeringnon-navigable zoneconstant resistance devicecollision systemresistance outputtheoretical analysistensile test
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