风速与波高对单跨高架栈桥位移响应的影响  

Influence of wind speed and wave height on displacement response of single span overhead trestle bridge

作　　者：李霞[1] 孙芦忠[1] 尹洪波 洪娟[1] 

机构地区：[1]解放军理工大学工程兵工程学院,江苏南京210007 [2]二炮工程设计研究院,北京100011

出　　处：《解放军理工大学学报（自然科学版）》2011年第2期172-177,共6页Journal of PLA University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(10772197)

摘　　要：为考察不同风速、波高时高架栈桥在风浪耦合作用下的位移特性,采用分离涡方法和任意拉格朗日-欧拉方法(ALE arbitrary lagrangian eulerian)求解栈桥系统的流固耦合位移响应。结果表明:风对栈桥所受风浪耦合荷载大小影响较大,高架栈桥的位移随风速增加而增大。波浪主要增加栈桥的往复振荡,同时,波浪对桥面附近空气扰动显著,使其所受风载减小,当波浪开始出现后,随着波高增大,波浪荷载所致位移增量大于由波浪引起的空气扰动所致风载造成的位移减小量,结构位移随波高增大而增大;当波高增大到一定程度,波浪荷载的影响小于风荷载,结构位移反而随波高增大而减小。To analyze the displacement response of the overhead trestle bridge subjected to different wind speeds and wave heights,the DES（detached eddy simulation） method and ALE（arbitrary Lagrangian Eulerian） method were employed to solve the response of the trestle bridge system during the fluid structure interaction.Results show that the wind mainly affects the wave loads on the trestle,and the higher the wind speed,the larger the displacement response; that the wave mainly increases the trestle＇s oscillation,and brings great disturbance to the air close to the trestle,which reduces the trestle＇s wind load;and that once the wave engenders and becomes higher,the displacement response increment caused by the wave load is larger than the reduction caused by the wind load,so the higher the wave,the larger the displacement response.However,when the wave height increases to high value,the wave load＇s influence becomes smaller than that of the wind load,and the displacement decreases along with the wave height increasement.

关 键 词：流固耦合 风速 波高 高架栈桥 位移响应 

分 类 号：U441[建筑科学—桥梁与隧道工程] O353[交通运输工程—道路与铁道工程]