半潜式平台横撑波浪抨击载荷下结构强度分析
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摘要
运用风洞和水池试验结果修正后的数值模型,同时考虑半潜式平台承受的风载荷、流载荷和波浪载荷等共同作用,以及采用锚泊系统的全尺度模拟,以某典型半潜式平台为例,利用Ansys-AQWA软件对半潜式平台横撑在波浪砰击载荷下的响应进行非线性数值分析。针对抨击工况中的10个子工况结果,以90%的Gumble分布值作为最终的平台横撑波浪砰击载荷。并运用此分析结果,结合横撑在总体结构强度的应力分布,分析了半潜式平台横撑在考虑波浪砰击下的结构强度。通过数值模拟研究表明:波浪砰击对横撑的影响很大,在横撑的结构强度分析中应充分考虑。
In this paper, according to a typical example of semi-submersible platform, the air gap of platform has been studied through the tuned and validated numerical model by the tank and wind tunnel test results by Ansys-AQWA. The wind, wave and current loads are simulated simultaneously. Meanwhile, the effect of the full scale mooring system has been simulated. The wave slamming of the brace have been simulated through the non-linear method. The value of 90% Gumble distribution for the 10 sub-cases results is chose as the final result of the wave slamming load on the brace. According to the wave slamming load, the structural strength of the brace has been analyze considered the global analysis results. It is to be seen that the wave slamming load are important for the analysis of the brace strength. Therefore, the wave slamming load should be considered for the analysis of brace structural in the design progress for engineering project.
In this paper, according to a typical example of semi-submersible platform, the air gap of platform has been studied through the tuned and validated numerical model by the tank and wind tunnel test results by Ansys-AQWA. The wind, wave and current loads are simulated simultaneously. Meanwhile, the effect of the full scale mooring system has been simulated. The wave slamming of the brace have been simulated through the non-linear method. The value of 90% Gumble distribution for the 10 sub-cases results is chose as the final result of the wave slamming load on the brace. According to the wave slamming load, the structural strength of the brace has been analyze considered the global analysis results. It is to be seen that the wave slamming load are important for the analysis of the brace strength. Therefore, the wave slamming load should be considered for the analysis of brace structural in the design progress for engineering project.
引文
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[2]霍发力.水深对半潜式平台水动力性能及波浪载荷的影响[J].船舶工程,2014(6):100-104.
[3]BITNER-GREGERSEN E M.Joint probabilistic description for combined seas[C]//Proceedings of 24th International Conference on Offshore Mechanics and Arctic Engineering.Halkidiki,Greece:OMAE 2005,12-17.
[4]Det.Norske Verital AS.DNV-RP-C205 Environmental Conditions and Environmental Loads[S].2010,10.
[5]Det.Norske Verital AS.DNV-RP-C103 Column-Stabilized Units[S].2012,4.
[6]Det.Norske Verital AS.DNV-OS-C103 Structural design of column stabilised units-LRFD method[S].2015,7.