Aerodynamic Response of a Bridge Girder Segment during Lifting Construction Stage
Publication: Journal of Bridge Engineering
Volume 24, Issue 8
Abstract
Investigations on the wind loads and aerodynamic responses of the bridge girder segment during the lifting construction stage are limited. Free vibration tests of a lifting girder segment of a kilometer-span cable-stayed bridge were carried out in a wind tunnel to study its aerodynamic performance. Large aerostatic displacements were observed in the wind velocity range of concern. Large-amplitude limit cycle oscillations (LCOs) around the horizontal axis perpendicular to the bridge span occurred when the full-scale velocity exceeded 25.3 m/s. The analytical expression of the eigenfrequency of the dangerous mode of a lifting girder segment was derived, and the analytical result was compared with those determined by using the finite-element analysis (FEA) and testing results. The characteristics of the large-amplitude LCOs under different conditions were thoroughly analyzed. For various testing cases, the influences of the angle of attack, wind velocity, and vibration amplitude on the vibration frequency and aerodynamic damping ratio were comprehensively investigated and the parameter identification accuracies were verified. It was demonstrated that more attention should be paid to assessing the wind-resistance of lifting girder segments to ensure the construction safety of long-span bridges. The results of the present work can provide beneficial reference for evaluating the wind-resistance performances of similar types of lifting girder segments.
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Acknowledgments
The research presented here was jointly supported by the Fundamental Research Funds for the Central Universities (DUT17ZD228), the National Program on Key Basic Research Project (973 Program, 2015CB057705), and the National Science Foundation of China (51478087), all of which support is gratefully acknowledged.
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Published In
Journal of Bridge Engineering
Volume 24 • Issue 8 • August 2019
Copyright
© 2019 American Society of Civil Engineers.
History
Received: Aug 28, 2018
Accepted: Feb 27, 2019
Published online: May 20, 2019
Published in print: Aug 1, 2019
Discussion open until: Oct 20, 2019
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