振动对拱桥短吊杆截面应力分布的影响

Vibration Effect on Crosssectional Stress Distribution of Short Suspenders in Arch Bridges

摘要:

研究了桥面振动对拱桥短吊杆截面应力不均匀分布规律的影响.假定短吊杆两端与拱肋及桥面均为固结，通过对桥面竖向及纵向振动作用下吊杆截面应力的理论推导及参数分析，探讨车速、车辆振动频率、修正的驱动频率等主要参数对吊杆截面应力的影响,概括出桥面振动荷载作用下吊杆不均匀应力分布情况及应力动态增大系数的范围.

Abstract:

A study is made of the effects of vibration of deck on the nonuniform crosssectional stress distribution on short suspenders of arch bridges with vertical suspenders.It is assumed that the suspenders are fixed at the connections with the ribs and the deck. The stress of suspender caused by the vertical vibration and longitudinal vibration of deck is derived and the influence factors are discussed, such as vehicle speed, vehicle frequency, driving frequencies with shift, etc.From the stress time history of suspender, the nonuniform stress distribution of short suspender is illustrated, and the range of the dynamic enhancement coefficient of stress is suggested based on an engineering project.