RESEARCH ON VORTEX RESONANCE DEPRESSION MECHANISM OF BRIDGE DECK WITH AERODYNAMIC MEASURES
XU Fuyou1;LIN Zhixing3;LI Yongning3;LOU Wenjuan1
1. College of Civil Engineering and Architecture, Zhejiang University; Hangzhou 310027, China
2.School of Civil & Hydraulic Engineering, Dalian University of Technology, Dalian 116024, China;3. State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University; Shanghai 200092, China;
Abstract：The vortex vibration characteristics of one bridge deck with airflow-suppressing board, guide vane and without any aerodynamic measures are investigated by face pressure measuring method. Based on three sections pressure time histories at different wind velocities, the means, standard deviations, power spectra of fluctuated pressures, as well as the correlations between local and total aerodynamic forces are comprehensively analyzed, and the tosional vortex mechanism and aerodynamic measures suppressing mechanism are disclosed. It reveals that severe fluctuation of pressure at the middle and downstream regions at the upper face construct the fundamental momentum for vortex resonance, which are incurred by the flow separation at the front upper face. The fluctuated pressures keep the same dominant frequencies. And the local aerodynamic forces keep good correlations with the total ones. The flow distribution at the upper face is adjusted and improved by the airflow-suppressing board, and the vortex resonance is effectively suppressed. For the negligible influence on flow fields at upper face, the guide vane is ineffective.
2010, Vol. 29 
