SEISMIC BEHAVIOR OF SUPER LONG MULTI-SPAN SUSPENSION BRIDGE WITH CENTER SPAN LENGTH OF 3000M

Abstract

 In this study, we analyzed the seismic behavior of multi-span suspension bridges with a center span length of 3000 m. Since the characteristic vibration periodicity of the suspension bridge differ depending on the member, multiple observation waves which greatly influence each are selected and excited in three directions at the same time. In addition, since the deformation of the suspension bridge will be estimated to be very large at the time of the earthquake, the time history response analysis considering the geometric nonlinearity and compared its behavior by the number of spans. Furthermore, since the total length is as long as 6 to 12 km, we also carried out multipoint input analysis considering the phase difference of the seismic motion, and we made comparison based on the presence or absence of phase difference.