Parameters optimization of base isolated structure based on system reliability

PDF(1779 KB)

Journal of Vibration and Shock ›› 2013, Vol. 32 ›› Issue (12) : 6-10.

论文

Parameters optimization of base isolated structure based on system reliability

SUN Zhen，LIU Wei-qing，WANG Shu-guang, DU Dong-sheng

Author information +

History +

Abstract

The simplified two masses calculating model of base isolated structure is established in order to study the system reliability which considering the affection of crucial design parameters. The Bouc-Wen model is used to simulate the isolation layer and the stiffness degradation of Bouc-Wen model is used to simulate the upper structure. The motion equation of the base isolated structure is established. The pseudo excitation method and reliability theories are used to analyze the random responses and reliability of the system under varied period ratios, yield force ratios and damping ratios. The design parameters of the base isolated structure are optimized by reliability objective. Those theories are used to analyze stationary random earthquake responses of a base isolated structure which located in 8 degree seismic precautionary intensity. The story displacements and the system reliabilities of the isolation layer and the superstructure are calculated. The results show that the proper selection of the period ratio, the yield force ratio and the damping ratio can make the displacement responses minimum. So the system reliability of the base isolated structure is high. This research which can assess the reliability and the security totally is instructive for structural performance design and state control of base isolated structure.

Key words

base isolated structure / two mass calculating model / Bouc-Wen model / stationary random earthquake response / system reliability / parameters optimization

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

SUN Zhen;LIU Wei-qing;WANG Shu-guang;DU Dong-sheng. Parameters optimization of base isolated structure based on system reliability[J]. Journal of Vibration and Shock, 2013, 32(12): 6-10