Baihua Bridge, which was seriously damaged in Wenchuan earthquake, was chosen as the object of study. A numerical model was created, in which the nonlinear behaviors of columns, tie beams, laminated rubber bearings, reinforced concrete transverse retainers, expansion joints and abutments were considered. Then a Incremental Dynamic Analysis (IDA) was carried out with ground motions recorded at Wolong station, which is the nearest station from bridge. The results of numerical analysis showed that the collapse of the fifth continuous girder was mainly caused by the small bearing length at the eighteenth span. And the unreasonable support distribution method was another significant factor, which lead to two columns of the fixed pier cannot bear load together. Thus the fixed pier could not offer enough vertical restraint to the girder because one of its columns was damaged severely very early.
Key words
Wenchuan earthquake /
Baihua Bridge /
seismic damage analysis /
IDA
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