大跨刚构桥梁气动弹性试验及分析

对位于台风袭击地区的大跨预应力混凝土薄壁柔性墩刚架桥,其最大双悬臂状态为在整个施工过程中最不利抗风状态。本文以一座位于强台风地区的实桥为例,通过对此类桥梁的成桥和施工状态的动力特性的特点、全桥气动弹性模型的设计方法、紊流风场的模拟和风洞试验的介绍,讨论了这种变截面结构桥梁的气动弹性问题,在准定常假定的基础上,给出了此类桥梁的驰振稳定性判别准则和频率域中的抖振分析方法,并同试验结果进行了比较

Aeroelasticity of Long-Span Rigid Frame Bridges under Construction Stage

The longest double cantilevered construction stage for long span prestressed concrete rigid frame bridges with double thin walled flexible piers at typhoon prone area is the most unfavorits stage for wind resistance.The aeroelastic problems such as galloping,buffeting and wind loading for such kind of the bridge structur with varied cross sections are discussed in this paper through an example of a full aeroelastic wind tunnel testing of a real bridge at very strong typhoon prone area,in which the analysis of the dynamic characteristics for the structure during operation and under construction stage,aeroelastic model designing,turbulent wind field simulating are also conducted.The galloping criterion and buffeting response analysis in frequency domain for such kind of bridges with varied cross sections are further developed.