内河底梁式全直桩码头结构模态分析  

Modal analysis on the structure of all-vertical-piled pier with bottom beam

作　　者：刘晓平[1] 林积大[1] 周俊[1] 陈亚娇[1] 

机构地区：[1]长沙理工大学水利工程学院,湖南长沙410004

出　　处：《交通科学与工程》2011年第4期36-40,共5页Journal of Transport Science and Engineering

摘　　要：介绍一种能满足防洪要求并能承受较大水平荷载的新型全直桩码头结构-底梁式全直桩码头结构.为了解该码头结构的动力特性,通过有限元法对底梁式全直桩码头结构和普通全直桩码头结构进行模态分析,比较不同码头结构类型的模态差别,并详细分析了结构低阶模态振型特点,对底梁式全直桩码头结构的动力特性进行研究和探讨.分析结果表明:底梁式全直桩码头结构的固有频率比普通全直桩码头有较大的提高,结构的整体刚度得到了提升;码头结构前3阶固有频率较低,易被激发引起结构共振,因此,在码头运营过程中,应尽量避免出现与低阶频率相近的振源.A new kind of all-vertical-piled pier structure that can meet flood control requirements and be able to withstand large horizontal loads is introduced.In order to study the structure of this dynamic characteristics,the 3D finite element model for this new structure and conventional all-vertical-piled pier structure by finite element method is built,then modal analysis on it was given.Different terminal structure type of modal differences,and the low step vibration modes＇ characteristics were analyzed.The result shows that the stiffness of structure of all-vertical-piled pier with bottom beam,compared with conventional all-vertical-piled pier,has improved greatly.The first three natural frequencies of the structure were the lowest and easily to be excited by structural resonance.The work frequency could be avoided close to the low frequency in the process of pier operations.

关 键 词：底梁式全直桩码头 振动特性 模态分析 有限元法 

分 类 号：U656.113[交通运输工程—港口、海岸及近海工程]