Study on Lateral Seismic Design Scheme of Super-long-span Cable-stayed Bridge
Aiming at the anti-seismic analysis of long-span cable-stayed bridge under the high-intensity lateral earthquake,three design methods of adding the baffle plate,metal damper and viscous dampers are commonly used in the current projects.Based on MIDAS Civil,a three-dimensional finite element dynamic elastic model is established to analyze the dynamic characteristics of the bridge structure.By comparing and analyzing the three parameterized schemes with the transverse free boundary conditions of the beam pier,the characteristics of the structural seismic response of the three design schemes under the control of the lateral ultimate displacement are studied.For the damping schemes of viscous damper and metal damper,the local optimization of the two damper combinations and layout schemes is carried out.The results show that the internal force at the bottom of pier pylon of damping scheme adding the baffle plate is larger than that of damper scheme.The damping effect of the viscous damper design scheme is the best.After the comprehensive comparison,the combination scheme 1 is recommended for the railway long-span cable-stayed bridge.
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