橋梁の耐震・地震時挙動

[CS10-41] RESPONSE AMPLIFICATION DUE TO ANTISYMMETRIC MODES EXCITATION IN A CABLE-STAYED BRIDGE UNDER MULTIPLE SUPPORT EXCITATIONS

〇Hafiz Ahmed Waqas¹, Di Su¹, Tomonori Nagayama¹ (1.The University of Tokyo)

Keywords:Multiple support excitation, Synchronous excitation, Impact ratio, Siesmic design

Long-span bridges are subjected to Multiple Support Excitation (MSE) in contrast to the simplified design Synchronous Excitation (SE) resulting in dissimilar structural response. Modern seismic design codes are rather deficient to tackle this issue more research is required. Previously, it was found that the response amplification is linked to those modes that are not excited by SE. Artificial input motions and simpler bridge structures of relatively shorter span lengths were analyzed. However, investigation of MSE effects on long-span bridges with real seismic records is also desirable.