A Numerical Analysis for Efficiency of Multiple Input of Earthquake Wave to Dynamic Response of Large-span Connected Structure

A numerical model was established for seismic dynamic response of large-span connected structure under multiply input earthquake waves. It started from dynamic finite element method. The software for its numerical solution was presented with Newmark-beta method. Computation results showed that under multiply input earthquake waves, both the horizontal and vertical drift at structural top experienced little varitions and either the internal forces at fixed ends. The internal forces increased with cross-section flexural inertia. The local bending moment decreased with height of bridge, but the local axial forces increased with it, which means the increase of global bending moment. The consistent input method for earthquake waves should still be effective if the length of bridge is less than 60m.