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 MSE

〇わかす はふぃずあはめど¹、迪 蘇¹、智則 長山¹ (1.東京大学)

キーワード：複数のサポート励起、同期励起、インパクトレシオ、耐震設計

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.