中日桥梁抗震设计规范中群桩基础设计的比较研究

该文比较了中国和日本两国桥梁抗震设计规范中群桩基础的抗震设计方法,并结合一座连续梁桥分别采用中日规范进行抗震分析与比较。中国规范要求桩基在地震中保持弹性工作状态,而日本规范允许桩基在特殊情况下塑性屈服;中国规范对群桩基础仅进行强度指标验算,而日本规范对强度、位移或转角进行验算;中日规范的群桩基础抗震计算方法基本相同。实例计算表明:对于桥墩的地震需求,"日本规范"明显比"中国规范"大;但对于群桩基础的地震需求,当桥墩屈服后,基本一致;基础的转角不控制设计。

Comparison and Study of Group Pile Foundation Design in China - Japan Bridge Seismic Design Code

The article compares the seismic design methods of group pile foundation in the bridge seismic design code of China and Japan,and carries out the seismic analysis and comparison of a regulated continuous beam bridge separately according to the standards of China and Japan.The pile foundation is required to keep in the elastic working state during an earthquake according to the Chinese Code,but the Japanese Code allows the pipe foundation is in plastic yielding state under the special condition.The Chinese Code only checks and calculates the intensity index for the group pile foundation,but the Japanese Code checks and calculates the intensity,displacement or corner.The seismic calculation methods of group pile foundation in the Chinese and Japanese codes are basically same.The practical calculation shows that the "Japanese Code" is obviously higher than the "Chinese Code" for the earthquake demands of bridge pier,but these codes are basically identical for the earthquake demands of group pile foundations after the yielding of bridge pier.The corner of foundation does not control the design.