基于塔-索-拱建模的大跨钢管混凝土拱桥施工阶段动力特性研究  

Dynamic Characteristics of CFST Arch Bridge in Construction Stage by Tower-Cable-Arch Integration Modeling

作　　者：曾勇[1,2] 谭红梅[1,2] 

机构地区：[1]重庆交通大学山区桥梁与隧道工程省部共建国家重点实验室培育基地,重庆400074 [2]重庆交通大学山区桥梁结构与材料教育部工程研究中心,重庆400074

出　　处：《重庆交通大学学报（自然科学版）》2014年第5期17-21,36,共6页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：国家"973"计划研究专项课题(2012CB723305);交通运输部应用基础研究项目(2013319814180);重庆市交委科技项目(cqjw2009-5);浙江省公路管理局科研项目(2011H41)

摘　　要：扣塔、扣索和拱肋之间存在耦合效应,塔-索-拱一体化建模才能真实反应大跨度钢管混凝土拱桥施工阶段的动力特性。运用有限元软件ANSYS,建立了塔-索-拱一体化施工阶段的目前最大跨度的钢管混凝土拱桥合江长江一桥(模型1),研究了该体系的动力特性,并与不考虑扣塔的索—拱模型(模型2)进行了对比。研究结果表明:考虑扣塔建模后,模型1的基频降低了12%,拱肋与扣塔相互耦合,高阶振型复杂,结构横桥向刚度弱,结构的风敏感性更为突出;两个模型的30阶后的频率接近一条直线,背、扣索的索力变化对低价频率影响不大。Due to the coupling effects between arch rib, cable and tower, only the tower-cable-arch integration modeling can simulate the true dynamic characteristics of concrete filled steel tube （CFST） arch bridges in construction. The current largest span CFST arch bridge -- Hejiang 1 ^st Yangtze River Bridge model （model 1 ） in the tower-cable-arch integration construction was established by finite element software ANSYS, and its dynamic characteristics were also investigated. And the dynamic characteristics of model 1 were compared with those of cable-arch model without the consideration of tower （model 2）. Research results show that considering the tower effects, the fundamental frequency of model 1 drops by 12%, compared with model 2. Due to the coupling effects of arch rib and tower, the higher vibration modes of CFST structures are complex, the structure transverse stiffness are notably weak and CFST structures have the outstanding wind sensitivity ; the high frequencies of two models are nearly close to a straight line. The change of cable forces has little influence on low frequency.

关 键 词：桥梁工程 塔-索-拱 钢管混凝土拱桥 一体化建模 振型 动力特性 基频 耦合 

分 类 号：U448.1[建筑科学—桥梁与隧道工程]