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Double-swing interface method for controlling higher order mode effect of self-reset high piers |
ZHANG Yuzhi, QIN Bocong, ZHOU Kaixuan, HUANG Rong, HU Hao, LIU Dongdong |
School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China |
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Abstract 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.
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Received: 17 July 2018
Published: 28 December 2019
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