Investigation on simplified response spectrum analysis method for seismic support hangers

doi:10.16265/j.cnki.issn 1003-3033.2021.11.014

Abstract

Abstract: In order to address the calculation error of equivalent lateral force method due to its ignorance of coupling influence of building structures and dynamic performance of seismic support hangers, a dynamic amplification coefficient of seismic support hanger system was introduced. Then, acceleration of the hanger was obtained on the basis of vibration mode response spectrum analysis of main structures, and horizontal seismic action was calculated. Based on studies of periodic distribution characteristics of the hanger system, influence law of site type and main structure on dynamic amplification coefficient was analyzed, and probability distribution model of the coefficient was obtained before its recommended calculation value was given. The results show that as natural vibration period of pipelines is greater than 0.1 s, equivalent lateral force method is not suitable for calculation of seismic support hangers. At class IV site, dynamic amplification factor is relatively concentrated. As structural height increases, concentration degree of dynamic amplification coefficient increases while average value is relatively small. In terms of actual engineering design, influence of above factors and dynamic characteristics of the hanger should both be considered, and design value of dynamic amplification coefficient should be 1.25.

Key words: seismic support hanger, response spectrum, classification of site, natural vibration period, dynamic magnifying factor

CLC Number:

X924.2

SONG Yongsheng, DING Youliang, JIA Huijuan, SHAN Jiandong, WANG Zhe, CHEN Jiayao. Investigation on simplified response spectrum analysis method for seismic support hangers[J]. China Safety Science Journal, 2021, 31(11): 100-105.

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