海工结构物桩基础竖向稳定性的可靠度分析

Reliability analysis on vertical stability of pile foundations of ocean structures

应用可靠度理论对渤海海域中海工结构物桩基础的稳定性进行了可靠度分析,阐述了各个设计指标的变化对分项系数及可靠度指标的影响规律,并进一步对各指标的灵敏度进行比较分析。分析结果表明,在各个设计参数中,厚土层的强度指标和设计荷载是两个相对重要的参数,在渤海海域中应用API标准中规定的荷载抗力系数进行设计是适用的。

Pile foundation is an important type of foundation for ocean structures. The design method based on reliability analysis has been used overseas. The API specifications are recommended in China without checking whether it is suitable for the environmental and geological conditions. Therefore, researches should be carried out for this purpose. This paper uses reliability theory to analyze the stability of pile foundation for ocean structures in Bohai Gulf. In the analysis, much attention has been paid to how the varieties of design indexes act on partial factors and reliability index. Results show that both the strength index of thicker soil layer and design loads are comparatively important parameters. The partial factors obtained from the analysis agree well with those recommended in API Code. The analysis shows that the use of API Code in design is acceptable in Bohai Gulf.