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

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.

Key words:arch bridge; suspender; stress distribution; vibration of deck; driving frequencies with shift