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Research on the Application of TLD to Viaduct Box Girder Bridges for Vibration and Noise Reduction

Simulation was conducted to study the feasibility of TLD (tuned liquid damper) on the vibration and noise reduction of rail transit viaduct box girder bridges. The vibration of a 30m span simply supported box girder bridge paved with slab track was modeled in ANSYS. The noise radiation characteristics before and after the installation of TLD were analyzed with Virtual.lab. Results show that TLD can effectively reduce the vibration and noise radiation of rail transit box girder bridges. The vertical displacement peaks of the flange and web can decrease about 40%, while the lateral displacement amplitudes decline by 30%. The lateral noise near webs can reduce 2~3db. The vertical damping property of TLD changes along with the difference of liquid level, and improper use can increase the surface vibration on the contrary. It is suggested that TLD should be used in engineering together with other vibration control measures to reduce the disadvantages.