Title :
Estimation of Damping Matrices of Cable-Stayed Bridges Based on Known Data of Modal Damping
Author :
Zhan-Yu, Bu ; Xu, Xie ; Yong, Ding
Author_Institution :
Fac. of Archit., Civil Eng. & Environ., Ningbo Univ., Ningbo, China
Abstract :
The composition of damping in cable-stayed bridges is complicated. It is difficult to determine the damping matrices precisely. A method to calculate the estimation of damping matrices of cable-stayed bridges by known damping ratios is proposed in this paper. Based on the assumption that the damping coefficients of substructures (i.e. Girder, tower, cable, support etc.) in cable-stayed bridges don´t change with frequency or amplitude of vibration, the complex eigenvector and natural frequency of cable-stayed bridges are derived by non-proportional damping state-space method. The results have high precision, which fulfill the requirement of dynamic calculation of structures. The damping matrices have more information than modal damping ratios, which has wide application in reality.
Keywords :
bridges (structures); damping; eigenvalues and eigenfunctions; modal analysis; state-space methods; vibrations; cable-stayed bridges; complex eigenvector; damping matrices estimation; damping ratios; modal damping; natural frequency; nonproportional damping state-space method; substructures; vibration; Bridges; Damping; Equations; Mathematical model; Shape; Structural beams; Vibrations; cable-stayed bridge; damping identification; non-proportional damping;
Conference_Titel :
Intelligent System Design and Engineering Application (ISDEA), 2010 International Conference on
Conference_Location :
Changsha
Print_ISBN :
978-1-4244-8333-4
DOI :
10.1109/ISDEA.2010.27
