Research on fatigue performance test method of welding structure of floating platform in deep water

In order to solve the applicability of the existing specifications to the fatigue design of complex welded structures of deep-water floating platforms, the bottleneck of multi cylinder cooperative control technology under various complex loads has been overcome. The first international structure level fatigue test device with biaxial tension compression + biaxial bending composite loading and the full-scale fatigue test device for welded joints with tension compression + bending composite loading have been developed. A test method for fatigue properties of standard samples in air, seawater free corrosion, cathodic protection corrosion and other environments was established. A multi-scale, multi-environment and multi-load fatigue test platform of “material level - node level - structure level” welding structure was constructed. It can provide strong support for the fatigue design verification of my country’s development of ultra-deep water floating platform in the complex and harsh marine environment of the South China Sea.