摘要
V形刚构-拱组合桥体系复杂,为了能更准确地认识和把握这种新型桥梁的力学性能,以小榄特大桥工程为例,建立精确的三维有限元模型,其中V形墩、梁、拱采用三维8节点实体单元,支撑采用空间梁单元和桁架单元,吊杆采用空间索单元进行离散。应用大型通用有限元软件ANSYS对其成桥阶段的主要工况进行弹性计算,同时也对该类桥型有可能出现的病害情况进行预测和模拟。据此,对比分析了各种情况下关键部位和构件的变形及受力状态。研究结果表明:该桥整体受力以V形连续刚构为主,拱对主梁起加劲作用;预应力对结构的安全性至关重要;该桥在一定数量内吊杆断裂的情况下,主体结构具有很好的内力重分配能力;拱脚处受力复杂,要采取构造措施防止局部破坏。
Structure of arch bridge with V-shaped rigid-frame is complicated.In order to know and master the mechanical property of this bridge,a 3D elastic finite element model of Xiaolan grand bridge was built,in which 8-node solid elements were adopted for discrete analysis of the main girder,the V-shaped rigid-frame and the arch,3D beam and truss elements for chord and web members,and 3D link elements for suspenders.The 3D elastic static calculation of the built bridge was performed based on the general finite element software ANSYS,and the possible wrecked conditions were also simulated.Based on these results,the deformations,stress distributions of the bridge and tension of the suspenders were analyzed and contrasted.The results indicate that（1） the V-shaped rigid-frame of the bridge bears the main loads while the arch play an reinforced role in load bearing;（2） prestress is very important to the security of the bridge;（3） the bridge has a good capability of stress-redistribution while some suspenders crack;（4）stress-distribution of the arch springing is complex,measures should be taken to avoid local failure.
出处
《公路交通科技》
CAS
CSCD
北大核心
2010年第10期66-71,共6页
Journal of Highway and Transportation Research and Development
基金
国家大学生创新试验项目(061048638)
关键词
桥梁工程
三维弹性静力分析
有限元方法
V形刚构-拱组合桥
吊杆作用
bridge engineering
3D elastic static analysis
finite element method
arch bridge with V-shaped rigid-frame
effect of suspender
