摘要
怀来官厅水库特大桥主桥为主跨720m的悬索桥,加劲梁采用钢-混凝土组合梁,采用现场节段吊装法施工。为指导该桥加劲梁吊装施工,采用ANSYS软件建立全桥及施工阶段的有限元模型,分析加劲梁整体式吊装和分离式吊装2种方案下结构的颤振稳定性及动力特性,并提出了抑振措施。结果表明:加劲梁整体式吊装方案比分离式吊装方案具有更好的动力特性和颤振稳定性,推荐采用整体式吊装方案施工;2种方案下结构的颤振临界风速小于相应的颤振检验风速,存在发生颤振的可能。因此,提出了采取增设竖向交叉索的临时加劲措施。通过抑振效果分析可知,该措施可以增加结构的扭转基频,显著提高施工阶段的结构颤振稳定性。
The main bridge of the Huailai Guanting Reservoir Bridge is a suspension bridge with the main span of 720 m. The stiffening girder of the bridge is the steel-concrete composite girder and is constructed, using the field segment hoisting and installation method. To guide the hoisting and installation of the stiffening girder, the finite element model for the whole bridge and for the construction stages of the bridge was established, using the software ANSYS, the flutter stability and dynamic characteristics of the structure under the 2 schemes of the integral or separate hoisting and installation were analyzed and the measures for suppressing the flutter were given. The results indicate that the scheme of the integral hoisting and installation has better flutter sta-bility and dynamic characteristics than the scheme of the separate hoisting and installation will have and the scheme of the integral hoisting and installation is hence recommended for the construction. For the 2 schemes, the flutter critical wind speeds of the structure are less than the corresponding checked critical wind speeds and the possibility of occurrence of the flutter does exist. In that case, the temporary stiffening measure of adding the vertical crossed hangers to the girder is proposed. According to the analysis of the suppression effect of the flutter, it is known that the stiffeningmeasure can increase the torsion base frequencies of the structure and can significantly improve the flutter stability of the structure at the construction stages.
出处
《桥梁建设》
EI
CSCD
北大核心
2018年第1期31-35,共5页
Bridge Construction
基金
天津市科技支撑计划重点项目(16YFZCSF00460)
天津市自然科学基金项目(16JCZDJC40300)~~
关键词
悬索桥
钢-混凝土组合梁
施工阶段
颤振临界风速
有限元法
动力特性
稳定性分析
suspension bridge
steel-concrete composite girder
construction stage
flutter critical wind speed
finite element method
dynamic characteristic
stability analysis
