Details

Autor(en) / Beteiligte

• 陈常松 颜东煌

Titel

Dynamic analysis and modal test of long-span cable-stayed bridge based on ambient excitation

Ist Teil von

• Journal of Central South University of Technology, 2007-01, Vol.14 (1), p.135-139

Ort / Verlag

School of Civil and Architectural Engineering, Central South University, Changsha 410083, China%School of Bridge and Structure Engineering, Changsha University of Science and Technology, Changsha 410076, China

Erscheinungsjahr

2007

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• To study the stiffness distribution of girder and the method to identify modal parameters of cable-stayed bridge, a simplified dynamical finite element method model named three beams model was established for the girder with double ribs. Based on the simplified model four stiffness formulae were deduced according to Hamilton principle. These formulae reflect well the contribution of the flexural, shearing, free torsion and restricted torsion deformation, respectively. An identification method about modal parameters was put forward by combining method of peak value and power spectral density according to modal test under ambient excitation. The dynamic finite element method analysis and modal test were carried out in a long-span concrete cable-stayed bridge. The results show that the errors of frequencies between theoretical analysis and test results are less than 10% mostly, and the most important modal parameters for cable-stayed bridge are determined to be the longitudinal floating mode, the first vertical flexural mode and the first torsional mode, which demonstrate that the method of stiffness distribution for three beams model is accurate and method to identify modal parameters is effective under ambient excitation modal test.