| 要旨 |
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. |