地震荷载作用下海洋平台结构物动力可靠度分析
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摘要
主要针对地震荷载作用下的海洋平台结构动力可靠性问题进行研究 .海洋平台动力可靠性实质上是综合应用动力响应理论和概率理论 ,先对平台结构响应特性起主要影响作用的随机变量进行抽样 ,然后进行平台结构随机响应分析 ,并对响应结果进行概率统计分析 ,进而求得平台结构动力可靠性 .本文分析过程中 ,考虑了地震烈度、地震输入方向、不同地震波等因素对结构响应的影响 .应用本文所提出的海洋平台结构物动力可靠度分析方法 ,结合工程应用 ,进行南海某三腿海洋平台动力可靠性评估 .分析结果表明 ,考虑了桩 -土共同作用后 ,平台结构刚度降低 ,系统结构更为柔软 ,因此考虑桩 -土共同作用后的结构响应比考虑六倍桩径处固定时的结构响应小 ;南海某三腿海洋平台体系动力可靠指标小于目标可靠指标 ,该平台在实际工程应用中是安全、合理和可行的 .
This work applied structural dynamics response theory and stochastic theory to develop a method for dynamic reliability analysis of offshore jacket platforms subjected to seismic action. In this method, the random variables that mainly affect the response characteristics of offshore platforms were selected and sampled. The stochastic responses of offshore platforms to these random variables and subjected to seismic action were analyzed. Statistical analysis of the response parameters yielded a probabilistic function describing and the response of the platform to seismic action. Finally dynamic reliability of offshore platforms can be achieved by proper application of the limit state function of the integrated platform structure under dynamic conditions. By means of the method proposed in this paper, the dynamic reliability of the Weizhou 11 4C offshore platform subjected to seismic action was evaluated. The Weizhou 11 4C platform is a tripod legs simple jacket platform located at the Gulf of Weizhou, South China Sea. In the dynamic reliability analysis, the influences of earthquake intensity, direction and occurrence frequency were considered. The analysis results showed that the responses of the Wei114 4C platform considering the pile soil structure mutual interaction, was less than that of a fixed platform with 6 times the diameter ; and that the dynamic reliability index of Weizhou 11 4C offshore platforms was high and the failure probability was very low. So the Wei11 4C platform subjected to seismic action is safe.
This work applied structural dynamics response theory and stochastic theory to develop a method for dynamic reliability analysis of offshore jacket platforms subjected to seismic action. In this method, the random variables that mainly affect the response characteristics of offshore platforms were selected and sampled. The stochastic responses of offshore platforms to these random variables and subjected to seismic action were analyzed. Statistical analysis of the response parameters yielded a probabilistic function describing and the response of the platform to seismic action. Finally dynamic reliability of offshore platforms can be achieved by proper application of the limit state function of the integrated platform structure under dynamic conditions. By means of the method proposed in this paper, the dynamic reliability of the Weizhou 11 4C offshore platform subjected to seismic action was evaluated. The Weizhou 11 4C platform is a tripod legs simple jacket platform located at the Gulf of Weizhou, South China Sea. In the dynamic reliability analysis, the influences of earthquake intensity, direction and occurrence frequency were considered. The analysis results showed that the responses of the Wei114 4C platform considering the pile soil structure mutual interaction, was less than that of a fixed platform with 6 times the diameter ; and that the dynamic reliability index of Weizhou 11 4C offshore platforms was high and the failure probability was very low. So the Wei11 4C platform subjected to seismic action is safe.
引文
[1]JIN Wei- liang,ZHENG Zhong- shuang,L I Hai- bo,etal.Hybrid analysis approach for stochastic response ofoffshore jacket platform s[J].ChinaOceanEngineering,2000,14(2):143-152.
[2]JIN Wei- liang.Reliability based- design for offshorejacket platform under extreme loads[J].ChinaOceanEngineering,1996,10(2):145-160.
[3]JIN Wei- liang.Evaluation of application of p- y curvemethod in offshore engineering foundation[J].ChinaOceanEngineering,1993,7(4):451-466.
[4]JIN Wei- liang,MOAN T.Reliability analysis of jacketplatform s considering the effect of structure- pile- soilinteraction[A].Proc.ofICOSSAR'97[C].Shinozuka&T Moan,Kyoto:KyotoU niversityPress,1997.255-266.
[5]庄一舟,金伟良,李海波,等.海洋导管架平台抗震可靠性分析方法[J].海洋学报,1999,21(5):129-136.ZHU ANG Yi- zhou,JIN Wei- liang,L I Hai- bo,et al.Aseismic reliability analysis approach for offshore jacketplatform s structures[J].Journal ofOceanography,1999,21(5):129-136.
[6]高小旺,鲍霭斌.地震作用的概率模型及其统计参数[J].地震工程与工程振动,1985,(1):13-22.GAO Xiao- wang,BAO Ai- bing.Probality m odel andStat.Param eter under earthshock[J].Earthquake andVibrationEngineering,1985,(1):13-22.
[7]金伟良,郑忠双,邹道勤,等.导管架平台随机响应混合分析方法[J].海洋工程,2001,19(1):14-18.JIN Wei- liang,ZHENG Zhong- shuang,ZHOU Dao-qin.Hybrid m ethod for stochastic response analysis ofoffshore platform structures[J].Journal ofOceanEngineering,2001,19(1):14-18
[2]JIN Wei- liang.Reliability based- design for offshorejacket platform under extreme loads[J].ChinaOceanEngineering,1996,10(2):145-160.
[3]JIN Wei- liang.Evaluation of application of p- y curvemethod in offshore engineering foundation[J].ChinaOceanEngineering,1993,7(4):451-466.
[4]JIN Wei- liang,MOAN T.Reliability analysis of jacketplatform s considering the effect of structure- pile- soilinteraction[A].Proc.ofICOSSAR'97[C].Shinozuka&T Moan,Kyoto:KyotoU niversityPress,1997.255-266.
[5]庄一舟,金伟良,李海波,等.海洋导管架平台抗震可靠性分析方法[J].海洋学报,1999,21(5):129-136.ZHU ANG Yi- zhou,JIN Wei- liang,L I Hai- bo,et al.Aseismic reliability analysis approach for offshore jacketplatform s structures[J].Journal ofOceanography,1999,21(5):129-136.
[6]高小旺,鲍霭斌.地震作用的概率模型及其统计参数[J].地震工程与工程振动,1985,(1):13-22.GAO Xiao- wang,BAO Ai- bing.Probality m odel andStat.Param eter under earthshock[J].Earthquake andVibrationEngineering,1985,(1):13-22.
[7]金伟良,郑忠双,邹道勤,等.导管架平台随机响应混合分析方法[J].海洋工程,2001,19(1):14-18.JIN Wei- liang,ZHENG Zhong- shuang,ZHOU Dao-qin.Hybrid m ethod for stochastic response analysis ofoffshore platform structures[J].Journal ofOceanEngineering,2001,19(1):14-18
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