Mechanical Characteristic Of Absorber And Its Application On The Bridges

ABSTRACT:The structural seismic performance of bridges can be improved significantly by applying seismic isolation technology.In order to make a deeper understanding of shock absorber, the following aspects have been done in this dissertation.Firstly, a series of mechanical characteristic tests for shock absorber was taken. This report presents some appropriate results of the hysteretic behavior and energy dissipation capacity of absorber under the low cycle loading experiment.And it shows that the ductility and energy dissipation capacity of absorber performs well at low cycle loading, and the stiffness in linear elastic is improved, which is consistent with our requirements to absorber.Secondly, the influences of seismic wave, foundation of bridge and the mechanical properties of bridge pier on the response of an isolated bridge with shock absorber was investigated.Several conclusions for properly applying shock absorber in bridges have been made. By numerical calculation, the seismic responses of bridge with absorber and without absorber are compared, which proved that absorber is effective to the seismic response of bridge. Then, the seismic response effection of bridge with absorber under the different seismic waves and the different responses in different pier heights were analyzed.Last, two examples, of the response of a bridge with shock absorber, were designed and analyzed based on the conclusions from this dissertation.The first example is a railway simple-beam bridge.The earthquake load of its pile was reduced by over 50 percent.The second is a city-railway continuous-beam bridge.The earthquake load of this main pile was reduced by over 80 percent.Both are obviously excellent improvements.There are 73 figures,31 tables,72 reference in this paper.