高墩大跨连续刚构桥抗震性能研究

Study on Seismic Performance of Tall-pier and Long-span Continuous Rigid-framed Bridge

用设有多个塑性铰的全桥计算模型研究了连续刚构桥的抗震性能,并与类似的连续梁桥作了比较。结果表明连续刚构桥在高烈度地震区所受的地震损伤仍很小,抗震性能明显高于类似的连续梁桥;刚构墩出现塑性后,与弹性的相比墩底的地震力明显减小,随着地震动强度的增加减小的幅度增大,但墩顶位移变化很小。

The seismic performance of tall-pier and long-span continuous rigid-framed bridge is studied by using the genreal analysis model with multi-plastic hinges,and compared with the similar continuous beam bridge.It is founded that the continuous rigid-framed bridge only suffers damage slightly in strong ground motions,and the earthquake resistant capability of this bridge is obviously more excellent than that of the continuous beam bridge.Compared with the elastic seismic response,seismic force at the base pier is significantly reduced when plastic hinges are formed in major pier.In addition,the seismic force is greatly reduced along with intensity of ground motion increasing,but increase of displacement at the pier top is not evident.