| Dynamic analysis and modal test of long-span cable-stayed bridge based on ambient excitation |
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| 作者姓名： | 陈常松 颜东煌 |
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| 作者单位： | School of Bridge and Structure Engineering Changsha University of Science and Technology，School of Bridge and Structure Engineering，Changsha University of Science and Technology，Changsha 410076，China School of Civil and Architectural Engineering，Central South University，Changsha 410083，China，Changsha 410076，China |
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| 基金项目： | 国家自然科学基金;高等学校博士学科点专项科研项目 |
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| 摘 要： | 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.
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| 关 键 词： | 桥梁工程学 钢索桥 动力有限元分析 模型实验 |
| 收稿时间： | 21 May 2006 |
| 修稿时间： | 2006-05-21 |
Dynamic analysis and modal test of long-span cable-stayed bridge based on ambient excitation |
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| Chen Chang-song,and Yan Dong-huang.Dynamic analysis and modal test of long-span cable-stayed bridge based on ambient excitation[J].Journal of Central South University of Technology,2007,14(1):135-139. |
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| Authors: | Chen Chang-song and Yan Dong-huang |
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| Affiliation: | 1. School of Bridge and Structure Engineering, Changsha University of Science and Technology, Changsha 410076, China; 2. School of Civil and Architectural Engineering, Central South University, Changsha 410083, China |
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| Abstract: | 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. |
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| Keywords: | bridge engineering cable-stayed bridge dynamic finite element method ambient excitation modal test |
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