[L74] 地震被害

[L2190] Seismic performance and evaluation on a RC rigid-frame arch bridge considering damage of foundation

施 鐘淇¹,幸左 賢二¹,張 建東²,佐々木 達生³ (1.九州工業大学,2.Jiangsu Transportation Research Institute,3.大日本コンサルタント)

キーワード：四川地震,ラーメンアーチ橋,高軸力比,損傷メカニズム

Xiaoyudong Bridge received great damage in Wenchuan Earthquake. As a RC rigid-frame arch bridge, its dynamic behavior was not sufficiently studied. By 2-span dynamic analyses, it is found exposure of pile made P3 more deformable. This caused more severe local failure on Span 4, especially failure of arch leg by axial stress up to 65% fck. Besides, local failure reduced degree of static indeterminacy, which caused gradual loss of entire stability. Consequently, Span 3 & 4 collapsed into river finally.
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