|Table of Contents|

Vertical Seismic Response of Subway Inter-story Isolated Superstructures(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2021年01期
Page:
11-22
Research Field:
Publishing date:

Info

Title:
Vertical Seismic Response of Subway Inter-story Isolated Superstructures
Author(s):
FAN Zhong1;  CUI Jun-wei2;  WANG Jin-jin1;  YANG Kai1;  GAO Song1;  LIU Xian-ming1;  GAO Yin-ying3
(1. China Architecture Design & Research Group, Beijing 100044, China; 2. China IPPR International Engineering Co., Ltd, Beijing 100089, China; 3. Beijing Metro Construction Administration Corporation Ltd., Beijing 100068, China)
Keywords:
subway superstructure;  vertical earthquake;  seismic isolation;  dynamic characteristic;  earthquake response
PACS:
TU352.1
DOI:
10.19815/j.jace.2020.11053
Abstract:
In order to investigate the response of subway large base-inter-story isolated tower under vertical earthquake, the characteristics of vertical vibration mode, period and mode mass participation coefficient of the large base-inter-story isolated tower were analyzed. Under the vertical seismic action of fortification intensity, the base shear force, vertical seismic force of the isolated supports and the internal force of transfer girders of the large base-inter-story isolated towers were investigated by mode decomposition response spectrum method and time-history analysis method. At the same time, the influence of tower height and vertical stiffness of isolation layer on vertical seismic response of the large base-inter-story isolated tower were studied. The results show that there is a vertical dominant vibration mode in the large base-inter-story isolated tower structure. With the increase of tower height, the period and the mode mass participation coefficient of vertical main vibration mode gradually increase. Under precautionary intensity vertical earthquakes, the average value of the vertical seismic force-weight ratio between vertical seismic force at the bottom of the tower and gravity load representative value is 0.35, and the average increase value is 4.6% compared to non-isolated tower. The average value of the isolated supports' vertical seismic reaction-weight ratio between the vertical seismic reaction and the reaction under the gravity load representative value is 0.30, and the average value of the transfer girders bending moment ratio between bending moment under vertical earthquake and bending moment under gravity load representative value is 0.31. With the increase of tower height, the vertical seismic force-weight ratio, the vertical seismic reaction-weight ratio of the isolated supports and the bending moment ratio of transfer girders decrease correspondingly.

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Last Update: 2021-01-20