离岸深水全直桩码头的地震损伤分析  

Seismic damage analysis of all-vertical-pile wharf in offshore deep water

作　　者：陈宇 石运东 孙熙平[3] CHEN Yu;SHI Yun-dong;SUN Xi-ping(Department of Civil Engineering,School of Airport Engineering,Civil Aviation University of China,Tianjin 300300,China;Department of Civil Engineering,School of Civil Engineering,Tianjin University,Tianjin 300350,China;Tianjin Research Institute for Water Transport Engineering,Ministry of Transport,Tianjin 300456,China)

机构地区：[1]中国民航大学机场学院土木工程系,天津300300 [2]天津大学建筑工程学院土木工程系,天津300350 [3]交通运输部天津水运工程科学研究所,天津300456

出　　处：《振动工程学报》2020年第1期111-119,共9页Journal of Vibration Engineering

基　　金：中央高校基本科研业务费项目中国民航大学专项资助项目(3122019102)

摘　　要：全直桩码头作为离岸深水海域广泛应用的一种高桩码头结构形式,其抗震性能和地震损伤破坏机理尚未被掌握。采用集中参数模型和附加质量法分别考虑桩-土相互作用和地震动水压力作用,应用纤维单元模型进行全直桩码头结构的地震损伤分析,并定义了基桩构件损伤准则和结构整体损伤准则。对一榀全直桩码头进行了强震作用下的损伤分析,结果表明全直桩码头结构在不同土层间和土与水间的交界处以及基桩顶部位置的基桩损伤较大,达到严重损伤程度;随着土层剪切波速的减小,结构的地震损伤指数明显增大,并且改变土层剪切波速会明显影响基桩的损伤分布模式;当剪切波速为100 m/s时,水深变化对码头地震损伤影响基本可以忽略;当剪切波速为400 m/s时,随着水深增加,结构地震损伤指数明显增大。All-vertical-pile wharf is a widely used high-pile wharf for offshore deep sea.However,its seismic performance and damage mechanism are unclear.By simulating the pile-soil interaction using the lumped mass model,considering the seismic hydrodynamic pressure using added mass method,the seismic damage analysis of all-vertical-pile wharf is conducted using fiber element model,and the damage criterions for the pile and structure are defined.The damage development process of an all-vertical-pile wharf under strong earthquakes is analyzed,and the results indicate that the piles suffer serious damage at the top of the pile and the boundaries between the soils and between the soil and the water.As soil shear wave velocity decreases,the seismic damage index of the structure increases obviously,and the varying soil shear wave velocity can obviously influence the damaged distribution mode of the piles.When the soil shear wave velocity is 100 m/s,the varying water depths have less influence on the structure,and when the soil shear wave velocity is 400 m/s,the damage index of structure increases significantly as the increased water depths.

关 键 词：全直桩码头 地震 损伤分析 纤维单元 

分 类 号：TU473[建筑科学—结构工程]