钢管桩桩头剪力键间距优化设计

在码头和深海工程中常采用剪力键连接钢管桩与上部结构,以提高钢管桩的承载力及结构整体性。剪力键的间距是影响钢管桩桩头受力性能的重要影响因素。以桩头带两个剪力键的钢管桩为研究对象,建立8组有限元模型,利用Gebman试验报告中的试验值与数模值进行对比。结果表明:1)试验值与数模值误差较小,且变化趋势一致。2)钢管桩承载力和钢管桩桩头复合刚度随着剪力键间距的增大先增加后减小,剪力键间距介于1. 0D～1. 2D时,钢管桩整体受力性能最好。3)剪力键的最优设计间距始终在1. 0D附近,随着桩径的增加,剪力键的最优设计间距可适当减小。其研究成果为实际工程中钢管桩桩头剪力键的设计提供了重要的参考。

Optimization design of shear key spacing of steel pipe pile head

In the dock and deep sea engineering,the shear key is often used to connect the steel pipe pile and the upper structure,which can improve the bearing capacity and structural integrity of the steel pipe pile.The spacing of shear keys is an important factor affecting the mechanical performance of steel pipe pile heads.Taking the steel pipe pile with two shear keys at the pile head as the research object,eight sets of finite element models are established,and the test values in Gebman test report and numerical model values are compared.The results showed that:1)The error between the experimental value and the digital modulus value is small,and the change trend is consistent.2)The bearing capacity of steel pipe piles and the composite stiffness of steel pipe piles increase at first and then decrease with the increase of shear key spacing.When the shear key spacing is between 1.0D and 1.2D,the steel pipe piles are in best performance.3)The optimal design spacing of the shear key is always around 1.0D.With the increase of the pile diameter,the optimal design spacing of the shear key can be appropriately reduced.The research results provide an important reference for the shear key design of steel pipe pile head in actual engineering.