地震被害Ⅱ

[2164] SEISMIC EVALUATION OF A RC RIGID-FRAME ARCH BRIDGE CONSIDERING DAMAGE DUE TO EXTREME AXIAL LOAD CONDITION

座長(土木)：渡辺(健)
座長(建築)：増田安彦
講演者：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.江蘇省交通科学研究院 3.大日本コンサルタント)

キーワード：failure mechanisms, high axial ratio, rigid-frame arch bridge, wenchuan earthquake, ラーメンアーチ橋, 四川地震, 損傷メカニズム, 高軸力比

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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 load up to 69% of Nmax. Besides, local failure reduced degree of static indeterminacy, which caused gradual loss of entire stability. Consequently, Span 3 & 4 collapsed into river finally.