A study on a base isolation RC frame structure with specially shaped columns designed for seismic fortification intensity 8 zone

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (20) : 154-163.

SU Hexian1,2, PAN Wen1,2, ZHANG Xingxian3, BAI Yu1,2, GAO Yonglin1,2, YU Mingkun4

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Abstract

The isolation performance of a base seismic isolated RC frame structure with specially shaped columns designed for seismic fortification intensity 8 (0.2 g) zone were investigated through numerical analyses and shaking table test.The base isolation design of RC frame structure with specially shaped columns was compared with that of a RC frame structure with common rectangular columns.A shaking table test was conducted on the model of base seismic isolated RC frame structure with specially shaped columns that satisfied the objective of base isolation design.Results show that the RC frame structure with specially shaped columns tends to have considerable lateral stiffness, which makes it have smaller horizontal seismic decrease coefficient than the RC frame structure with rectangular columns.In addition, the shaking table test shows that the acceleration and displacement responses of base seismic isolated RC frame structure with specially shaped columns are significantly reduced.That is to say, the seismic fortification objective, i.e., buildings are neither damaged when subjected to frequently earthquake influence nor collapsed when subjected to rarely earthquake, has been achieved.Furthermore, the base isolation has been validated to be one of effective ways to enhance the seismic performance of the RC frame structure with specially shaped columns.It should be noted, however, that the weakness of the upper structure should be carefully considered in seismic isolation design, and the development of the plastic state should be constrained to a certain level.In sum, the seismic isolation technique can improve the seismic performance of the RC frame structure with specially shaped columns in seismic fortification intensity 8 (0.2 g) zone, indicating the promising application in high intensity area.

Key words

RC frame structure with specially shaped columns / base isolation / horizontal seismic decrease co-efficient / seismic isolation design / shaking table test

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SU Hexian1,2, PAN Wen1,2, ZHANG Xingxian3, BAI Yu1,2, GAO Yonglin1,2, YU Mingkun4 . A study on a base isolation RC frame structure with specially shaped columns designed for seismic fortification intensity 8 zone[J]. Journal of Vibration and Shock, 2019, 38(20): 154-163

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