Abstract
The energy equations of MDOF bridges are established based on the energy equilibrium theory. With considering the seismic characteristics, the FEA model of one double-column pier of passenger dedicated line is established in order to research the seismic energy response and its distribution rules when MDOF bridges entry the nonlinear state. The study results are obtained as follow: Bridge subjected to minor ground motion is depended on damping energy dissipation to consume seismic input energy. On the contrary, a large number of inelastic deformation is generated when bridge is subjected to strong ground motion. So the seismic input energy is mainly consumed by hysteretic energy dissipation. So, some meaningful references are provided for the seismic design for bridge by using energy concept.
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