Effects of Pier Height on Seismic Performance of Simply-supported Girder Bridge with LNR Bearings
Laminated nature rubber bearings(LNR bearings)are designed to accommodate large shear displacement with low shear stiffness,enabling the dispersion of horizontal forces in bridge substruc-tures and coordinating the resistance of piers to horizontal forces.To investigate the seismic perform-ance of LNR bearings on bridges with different pier heights,a dynamic analysis of two types of bear-ings was conducted on multi-span highway simply-supported girder bridges with a standard span of 40 m,using plate rubber bearings as reference.In addition,the structural dynamic response was com-pared to evaluate the seismic performance of LNR bearings.The findings indicate that compared to plate rubber bearings,LNR bearings can extend the natural vibration periods of the structure and re-duce seismic internal forces in the bridge.As the pier height increases,the advantage of LNR bearings under longitudinal earthquakes diminishes significantly while remaining unaffected by transverse earthquakes.Additionally,there is a gradual decrease in the ratio between capacity and demand of in-ternal force for bridges utilizing LNR bearings.Taking these factors into consideration collectively,it can be concluded that the advantages of LNR bearings for high-pier bridges are not particularly pro-nounced.
万方数据
维普
