To improve seismic resilience of double-deck viaducts,a post-tensioned double-deck rocking frame bridge pier system is developed.Based on Lagrange equation and conservation of angular momentum,a dynamic analytical model of the rocking bridge is derived.Seismic response of the rocking system is analyzed and the influence of the parameters of post-tensioned tendons on rocking system is given using the analytical model.The overturing resistance of the rocking bridge under Ricker wavelet is evaluated.The results show that rocking frame pier with dimension in practice exhibits minor damage and residual displacements.With the increase of the initial prestress of the tendon,drifts of the upper columns decrease,whereas drifts of the lower columns show an increasing trend.In certain frequency range,the increase of the tendon design parameters can improve the overturing resistance of the rocking pier,while for other frequency range the tendon parameters jeopardize the stability of the system.
维普
万方数据