|Table of Contents|

Damping coefficient optimization of linear fluid viscous damper for suspension bridge(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2013年03期
Page:
33-39
Research Field:
道路与铁道工程
Publishing date:

Info

Title:
Damping coefficient optimization of linear fluid viscous damper for suspension bridge
Author(s):
ZHAO Guo-hui1;  GAO Jian-hua2;  LIU Jian-xin1;  LI Yu1
1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Department of Road and Bridge Engineering, Henan Vocational and Technical College of Communications, Zhengzhou 450005, Henan, China
Keywords:
suspension bridge;  fluid viscous damper;  optimum damping coefficient;  stochastic vibration theory;  parametric sensitivity study
PACS:
U448.25
DOI:
-
Abstract:
The longitudinal vibration of suspension bridge stiffening girder was simplified as some independent single degree of freedom vibration systems. Stochastic vibration theory was used, and earthquake excitation was simplified as stationary white-noise excitation, the analytical expression of absolute acceleration mean square for stiffening girder longitudinal vibration was deduced. According to the principle of derivative extremum, the minimum absolute acceleration mean square and the corresponding system optimum damping ratio were derived, and the analytical expression of optimum damping coefficient for suspension bridge linear fluid viscous damper was got. A suspension bridge was selected as example, parametric sensitivity study was carried out based on dynamic time-historical method, and the reliability of the analytical expression was verified. Analysis result shows that the theoretical optimum damping ratio of suspension bridge linear fluid viscous damper is 0.5, and the efficiency of damper reaches its maximum with the corresponding optimum damping coefficient. When damping ratio is 0.3, damper efficiency is about 90% of optimum damping ratio. When damping ratio is 0.4-0.6, damper efficiency is 99% of optimum damping ratio, so the optimum damping coefficient of linear fluid viscous damper can be adjusted properly in the range according to earthquake intensity, damper stroke and cost. 4 tabs, 12 figs, 13 refs.

References:

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Last Update: 2013-07-30