【摘 要】
：
Corrosion and fatigue cracks are major threats to the structural integrity of aging offshore platforms.For the rational estimation of the safety levels of aging
【机 构】
：
School of Naval Architecture and Ocean Engineering
论文部分内容阅读
Corrosion and fatigue cracks are major threats to the structural integrity of aging offshore platforms.For the rational estimation of the safety levels of aging platforms,a global reliability assessment approach for aging offshore platforms with corrosion and fatigue cracks is presented in this paper.The base shear capacity is taken as the global ultimate strength of the offshore plaffoms,it is modeled as a random process that decreases with time in the presence of corrosion and fatigue crack propagation.And the corrosion and fatigue crack growth rates in the main members and key joints are modeled as random variables.A simulation method of the extreme wave loads which are applied to the structures of offshore platforms is proposed too.Furthermore,the statistics of global base shear capacity and extreme wave loads are obtained by Monte Carlo simulation method.On the basis of the limit state equation of global failure mode,the instantaneous reliability and time dependent reliability assessment methods are both presented in this paper.Finally the instantaueous reliability index and time dependent failure probability of a jacket platform are estimated with different ages in the demonstration example.
其他文献
为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7
The offshore jacket platform is a complex and time-varying nonlinear system,which can be excited of harmful vibration by external loads.It is difficult to obtai
Fabrication of Gd2O2S:Pr scintillation ceramics by pressureless reaction sintering was investigated. The 2Gd2O3.(Gd,Pr)2(SO4)3.mH2O precursor was made by hydrot
Pipes inevitably encounter high ambient pressure and bending moment during the deepwater pipe-laying process,which can lead to elliptical buckling and even dete
It is necessary to pay more attention to the durability of concrete undergoing freeze-thaw cycles and seawater attack simultaneously.Investigated are the effect
The assembly coastal hfilding technique initiated at home and abroad,is for a novel vertical standing harbor structure.Its main concept is the assembling compon
A technique for the evaluation of the hydrodynamic coefficients of ships is outlined for ship oscillating in a numerical wave tank,which is established on Compu
本文通过房屋建筑施工说明,工程项目施工过程的质量控制对确保工程质量占据了非常重要的位置.其中强化培训、优选施工人员是质量控制的基础要领,加强材料设备的监管是保证工
拉延是利用利用拉延模具将平板毛坯制成开口空心零件,拉延成形是能否生产出合格零件产品的关键,汽车钣金件的质量好坏在很大程度上受拉延模质量的控制。通过分析某型汽车覆盖
本文主要是结合了笔者多年的工作经验针对公路养护进行了系统的探究.