求翻译：摘要：振动模态是结构的固有的、整体的特性。通过模态分析可以搞清楚结构物在某一易受影响的频率范围内各阶主要模态的特性，就可能预言结构在此频段内在外部或内部各种振源作用下实际振动响应。本文通过对重庆某直立式高桩框架码头采用midascivil进行模态分析，初步探讨其动力特性，为结构动态特性结构优化的研究提供依据。是什么意思？

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Summary: vibration mode is inherent in the structure and overall features. Through a modal analysis can be a clear structure in a vulnerable in the frequency range where the main modal characteristics, it may be predicted structure in this frequency band in the external or internal source of vibrati

Abstract: The vibration modality is the structure inherent, the whole characteristic.May make clear the structure through the modality analysis in some one easily in the frequency range which affects various steps main modality characteristic, the possibility predicted the structure intrinsic exteri

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