桥梁桩基承台抗震设计研究

Research on Seismic Design of Bridge Pile Foundation Caps

文章讨论了桥梁桩基承台抗震设计的现状,参照不同国家和地区的规范计算了承台配筋量,在此基础上结合实际桥梁抗震设计案例探讨了系梁刚度变化对数值变化时,桥梁桩基承台最不利截面处、滑动墩侧与固定墩侧底部弯矩的变化情况。结果表明,随着刚度变化对数值的增加,承台最不利截面处的弯矩迅速增大后趋于稳定,滑动墩侧与固定墩侧承台底的弯矩波动范围较大。

This paper discusses the current situation of seismic design of bridge pile foundation caps,and calculates the reinforcement amount of caps with reference to the specifications in different countries and regions.On this basis,combined with the actual bridge seismic design case,it discusses the change of bending moment at the most unfavorable section and at the bottom of the sliding pier side and fixed pier side of bridge pile foundation cap when the logarithm of tie beam stiffness changes.The results show that with the increase of the logarithm of stiffness change,the bending moment at the most unfavorable section of the cap increases rapidly and then tends to be stable,and the bending moment fluctuation range of the cap bottom on the sliding pier side and the fixed pier side is large.