多种环境力联合作用下杭州湾跨海大桥海中平台动力响应分析
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摘要
本文借助于通用商业有限元软件ANSYS对一个具体的实际工程———杭州湾跨海大桥海中平台进行了动力响应分析。作者首先以模态分析为基础,对海中平台分别进行了在波浪作用下的谐响应分析和在地震作用下的谱分析和时程分析。借助于海中平台在两种荷载下的动力响应分析,作者讨论了填芯混凝土、剪刀撑等几个关键设计参数及结构形式对平台动力响应的影响。分析指出填芯混凝土对结构的固有周期影响很大,同时泥面以上填芯对抵抗波浪作用十分有利。而剪刀撑对结构的振动特性影响不大,但可以显著减小动力响应位移。最后,作者分析了海中平台在波浪、地震联合作用下的动力响应。分析指出波浪对地震响应分析的影响不能忽略,因此应考虑波浪、地震联合作用下的动力响应分析。
The finite element analysis of the platform of Hangzhou Bay sea-crossing bridge was carried out with help of ANSYS.The harmonic response analysis under wave load was carried out based on the modal analysis,and also the spectrum analysis and time historic analysis were provided under earthquake action.The influence of the key parameters(core concrete,and cross brace) of the platform and the structural forms on the dynamic response were discussed.The core concrete has a great influence on the natural period of the platform,and is favorable for the platform submitted to the wave loading.The cross brace,of which the influence is negligible,is also helpful for the decrease of the dynamic response.Finally,the dynamic response of the platform under the combining wave,earthquake actions was performed,and point out that the influence of the wave for the dynamic response of the platform under earthquake is significant.
The finite element analysis of the platform of Hangzhou Bay sea-crossing bridge was carried out with help of ANSYS.The harmonic response analysis under wave load was carried out based on the modal analysis,and also the spectrum analysis and time historic analysis were provided under earthquake action.The influence of the key parameters(core concrete,and cross brace) of the platform and the structural forms on the dynamic response were discussed.The core concrete has a great influence on the natural period of the platform,and is favorable for the platform submitted to the wave loading.The cross brace,of which the influence is negligible,is also helpful for the decrease of the dynamic response.Finally,the dynamic response of the platform under the combining wave,earthquake actions was performed,and point out that the influence of the wave for the dynamic response of the platform under earthquake is significant.
引文
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[2]Pengzien J,Tseng W.Three Dimensional Dynamics Analysis of Fixed Offshore Platforms[M].Numerical Methods in Offshore Engineer-ing,Wiley,Chiehester,1978.
[3]Pengzien J,Tseng W.固定式近海平台的三维动力分析[J].国外地震工程,1983,6:198-207.
[4]杭州湾跨海大桥施工图设计[R].中交公路规划设计院,2004.
[5]竺艳蓉.海洋工程波浪力学[M].天津:天津大学出版社,1991.
[6]邱大洪.波浪理论及其工程应用[M].北京:高等教育出版社,1985.
[7]克拉夫R W,彭津J,著,王光远译.结构动力学[M].北京:科学出版社,1985.
[8]胡聿贤.地震工程学(第二版)[M].北京:地震出版社,2006.
[9]谢礼立,翟长海.最不利设计地震动研究[J].地震学报,2003,25(3):250-262.
[10]何晓宇,李宏男.地震与波浪联合作用下海洋平台动力特性分析[J].海洋工程,2007,25(3):18-25.
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