Earthquake damage Ⅱ

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

Zhongqi SHI¹, Kenji KOSA¹, Jiandong ZHANG², Tatsuo SASAKI³ (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)

Keywords: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.