控制自复位高墩高阶效应的双摇摆界面法

Double-swing interface method for controlling higher order mode effect of self-reset high piers

为控制只在墩底设置1个摇摆界面的自复位高墩(结构1)的高阶模态地震响应,研究了分别在1/2墩高截面(结构2)和墩身弯矩最大截面(结构3)设置第2个摇摆界面的双摇摆界面法的控制效果。以3种强度条件下的7条地震动作为输入,利用时程分析获得了3种结构的墩身最大弯矩、最大剪力及墩顶最大水平位移。通过对比分析发现:结构2不能有效控制高阶模态效应,而结构3能有效控制高阶模态效应。随地震动及其强度的不同,与结构1相比,结构3能使墩身最大弯矩及最大剪力分别减小20%~46%和19%~65%,但结构3会增大墩顶最大水平位移,需采用有效手段加以控制。

In order to control higher order mode seismic response of a self-reset high pier with a swing interface set up at pier bottom(named structure 1),the control effect of the double-swing interface method was studied through using structure 2 and structure 3,respectively.Structure 2 and 3 were formed by setting up the second swing interface at 1/2 pier height and the cross-section with the maximum pier body bending moment of structure 1,respectively.Seven ground motion records with 3 different intensities were taken as inputs,the 3 structures’the maximum pier body bending moments,the maximum shear forces and the maximum pier top horizontal displacements were obtained with the time history analysis method.It was found that structure 2 can’t effectively control higher order mode effect,while structure 3 can;compared with structure 1,structure 3 can make the maximum pier body bending moment and the maximum shear force be decreased by 20%-46% and 19%-65%,respectively according to different ground motion records and their intensities;but structure 3 can increase the maximum pier top horizontal displacement,and this displacement needs to control with effective means.