Evaluation of the seismic responses of a long-span cable-stayed bridge located in complex terrain based on an SHM-oriented model
|Issue:||Stahlbau", April 2015, n. 4, v. 84|
Long-span cable-stayed bridges often have multiple supports separated by certain distances. If a long-span bridge is located in a complex terrain with different local soil conditions, the spatial variability may result in quantitative and qualitative differences in seismic responses compared with those produced by synchronous motion at all supports. To conduct such a multi-support excitation analysis of a long-span bridge, the ground motion excitations at different supports of the bridge are traditionally reproduced using the unconditional simulation technique, which cannot reflect the realistic propagation of ground motions at the site where the bridge is located. In addition, the finite element model of a cable-stayed bridge cannot be calibrated before conducting the seismic analysis. Heretofore the difference in seismic responses between the FE model and an alternative model has not been investigated systematically. Furthermore, seismic response analyses of long-span bridges using in situ ground motions are very rare.
|Keywords:||seismic design, earthquake, ground motion, foundation, FE model, structural monitoring, Untergund|