两向地震波作用下导管架平台的受力分析
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摘要
导管架海洋平台多为全钢制框架结构,处于海洋的复杂环境中要承受多种荷载的作用,其中地震荷载对于这些框架式的结构的威胁是尤为突出的。本文利用流-固耦合理论将导管架平台与海水进行耦合,并且在地震荷载作用下提取平台的位移、加速度和应力,与非耦合工况进行对比。数值仿真表明:①在两向地震波作用下平台的最大位移和加速度均发生在顶部;②经过和海水耦合的平台与非耦合结构相比振动位移有所增加,但加速度与应力却减少,说明海水对导管架海洋平台是有一定的减振和保护作用的。
Offshore jacket platform are full steel frame structures,they support a variety of load in the complex ocean environment in which the threat of the earthquake load is particularly prominent.This paper coupled the offshore jacket platform with seawater by fluid-solid iteraction theory,and extracted displacement acceleration and stress under seismic load,then compared with uncoupled condition.Numerical simulation shows that: ① the maximum displacement and acceleration of the platform under two directions seismic waves occurred at the top;② comparing with the platform coupling with seawater and uncoupling it shows vibration displacement increase,but acceleration and stress reduce of coupling platform,and explains seawater can reduce damping of offshore jacket platform.
Offshore jacket platform are full steel frame structures,they support a variety of load in the complex ocean environment in which the threat of the earthquake load is particularly prominent.This paper coupled the offshore jacket platform with seawater by fluid-solid iteraction theory,and extracted displacement acceleration and stress under seismic load,then compared with uncoupled condition.Numerical simulation shows that: ① the maximum displacement and acceleration of the platform under two directions seismic waves occurred at the top;② comparing with the platform coupling with seawater and uncoupling it shows vibration displacement increase,but acceleration and stress reduce of coupling platform,and explains seawater can reduce damping of offshore jacket platform.
引文
[1]高耸结构设计规范编制组.高耸结构设计规范[S].(报批稿),2004.
[2]何敏娟,马人乐,朱亮.黑龙江钢结构电视塔设计若干关键技术研究[J].特种结构,2001,18(1):13-16.
[3]王兴国.导管架海洋平台结构优化设计研究[D].大连:大连理工大学,2003.
[4]刘季,何立民.高耸结构与高层建筑的竖向地震作用[J].建筑结构学报,1988,(2).
[5]祁德庆,于春海,王剑平,等.高耸结构物动力分析与振动控制[J].结构工程师,2004,20(4):29-32.
[6]谢礼立,翟长海.最不利设计地震动研究[J].地震学报,2003,25(3):250-261.
[2]何敏娟,马人乐,朱亮.黑龙江钢结构电视塔设计若干关键技术研究[J].特种结构,2001,18(1):13-16.
[3]王兴国.导管架海洋平台结构优化设计研究[D].大连:大连理工大学,2003.
[4]刘季,何立民.高耸结构与高层建筑的竖向地震作用[J].建筑结构学报,1988,(2).
[5]祁德庆,于春海,王剑平,等.高耸结构物动力分析与振动控制[J].结构工程师,2004,20(4):29-32.
[6]谢礼立,翟长海.最不利设计地震动研究[J].地震学报,2003,25(3):250-261.
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