摘要
在大跨度中承式拱桥中,主拱为受压构件,静风荷载不仅会引起结构的动力特性改变,还将导致结构强度破坏和失稳。尤其当桥梁跨度较大、横撑又较少时,其静风稳定规律与斜拉桥、悬索桥等桥梁有较大的区别。文中以重庆菜园坝长江大桥为例,通过节段模型试验,获取了静风荷载在重庆菜园坝长江大桥上作用的全过程位移响应,分析了静风作用下结构的屈服失稳机制。分析表明,静风的初始攻角、材料的强度、静力三分力系数等因素对大跨度中承式拱桥的静风稳定性均有较大的影响。
AThe main arch of a long-span arch bridge is a compression member. The static wind loads on the bridge not only causes changes of dynamic characters, but also leads the structure to collapse or buckling. Especially, when the arch bridge has longer span and less lateral braces, its stability is much different from the long span cable-stayed bridges and suspension bridges. This paper takes Chongqing Caiyuanba Yangzi River Bridge as a typical example and conducted the wind section tunnel tests. The displacement response of the bridge is obtained and its yield and static stability mechanism under static wind is analyzed. The results show that those factors, such as initial attack angle of the static wind, material yield strength and the static forces coefficients, have great effects on the aer0statics stability of a long span half-through arch bridge.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2012年第10期51-56,共6页
Journal of Chongqing University
基金
中央高校基本科研费资助项目(CDJZR112000)
重庆市建设科技计划项目(城科字2011第(2-88)号)
关键词
中承式拱桥
静风稳定
静风荷载
失稳机理
half-through arch bridge
aerostatics stability
static wind loads
instability mechanism
