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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。
In this paper, with the aid of the commercial finite element software ANSYS, the dynamic response of a specific practical project --- the offshore platform of Hangzhou Bay Bridge was analyzed. Firstly, based on modal analysis, the author conducts the harmonic response analysis under wave and the spectral analysis and time history analysis under the action of earthquake respectively on the offshore platform. With the help of the dynamic response analysis of the offshore platform under two kinds of loads, the author discusses the influence of several key design parameters such as core-filled concrete and scissor support on the dynamic response of the platform. It is pointed out that the core-infill concrete has a great influence on the natural period of the structure. Meanwhile, the core above the mud surface is very beneficial to resist the wave. The scissor strut has little effect on the vibration characteristics of the structure, but can significantly reduce the dynamic response displacement. Finally, the author analyzes the dynamic response of the platform in the sea under the combined action of waves and earthquakes. The analysis shows that the influence of wave on the seismic response analysis can not be neglected. Therefore, the dynamic response analysis under the joint action of waves and earthquakes should be considered.