求翻译：本研究以重庆某直立式高桩框架码头为依托，采用midas建立空间刚架模型并进行模态分析。提取关键模态分析结构的振型特点是什么意思？

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This research to Chongqing A Framework tower pier as a high-stakes, relying on a midas just rack space models and model analysis. Extract key model analysis of the structure-type characteristics

This research take the Chongqing some erectness type high pile frame wharf as a backing, uses the midas establishment space rigid frame model and carries on the modality analysis.The extraction essential modality analysis structure inspires the characteristic

A pedestal of this study on Chongqing high pile piers based on the framework, the use of Midas and modal analysis of space frame model. Extraction of key characteristics of vibration modal analysis of structures

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