Abstract:Base rocking isolation structures are one of the hot topics on the seismic performance of new structures and the development of a new type of structural seismic system.This paper proposed a new type of base swing isolation bridge pier model with the additional platform and high damping rubber bearing, and introduced the specific structural details of the new base rocking isolation pier , and elaborateds the seismic principle and advantages of the new base swing isolation bridge pier.Through a shaking table test, it is concluded that the new pier can significantly reduce the horizontal acceleration of the pier and the stress at the bottom of the pier, but at the same time increase the horizontal displacement of the pier.The excessive horizontal displacement of the pier top will affect the normal use limit state of the pier.The article takes the horizontal displacement of the pier as the design control point, considering the width of the compression zone and the bending deformation of the pier during the actual swinging and lifting process.Influence, the mechanical relationship between the horizontal seismic force F of the pier top and the horizontal lift-off displacement δ of the pier top was established by the static equilibrium condition, and the displacement dynamic amplification factor β was introduced to consider the dynamic displacement Δ of the actual pier pier, so that the horizontal displacement of the pier top is Δ, which meets the numerical requirements of the allowable displacement of the pier top of the railway bridge specification 5L.At the end of the paper, the theoretical derivation relation was verified.The results show that the theoretically derived mechanical relations and numerical simulation results are in good agreement, and the main reasons for the deviation were analyzed.
郭展1,陈兴冲1,2,丁明波1,2,管嘉达1,王天斌1,张永亮1. 新型基底摇摆隔震桥墩柱抗震性能试验与分析[J]. 振动与冲击, 2020, 39(4): 69-74.
GUO Zhan1,CHEN Xingchong1,2,DING Mingbo1,2,GUAN Jiada1,WANG Tianbin1,ZHANG Yongliang1. Experimental study and analysis on the seismic performance of new base rocking isolation bridge piers. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(4): 69-74.
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