CONTROL OF WIND-INDUCED VIBRATION IN LARGE SPAN CABLE-STAYED BRIDGE WITH HIGH PIERS DURING CANTILEVER CONSTRUCTION STAGES

The natural frequency of large span cable-stayed bridges with high piers during cantilever construction stages is very low and it is sensitive to excitation due to wind. Control of wind-induced vibrations in large span cable-stayed bridges with high piers during their cantilever construction stage was investigated using the example of Chishi bridge, currently under construction. On the basis of a review of state-of-the-art of wind-induced vibration control measures for large span cable-stayed bridges with high piers, considering the unique factors of Chishi bridge, a wind-induced vibration control measure was selected: a combination of tie-down cables and TMD’s. A time domain buffeting analysis of large span bridges was conducted based on Davenport buffeting theory with ANSYS APDL language. Finally, numerical calculations and field measurement of the wind-induced vibration of Chishi bridge under cantilever construction stages with and without wind-induced vibrations control measures were conducted. The results show that wind-induced vibration responses can be reduced significantly using the wind-vibration control measures of tie-down cables and TMD’s. The numerical results regarding the effects of wind-induced vibrations control measures generally agree well with the field measured results.