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Flutter Analysis of Long-Span Suspension Bridge during Completed Stage

Author: ZhouJi
Tutor: LiaoHaiLi
School: Southwest Jiaotong University
Course: Bridge and Tunnel Engineering
Keywords: Flutter Long Span Suspension Bridges Frequency domain analysis Time domain analysis
CLC: U441.3
Type: Master's thesis
Year: 2011
Downloads: 42
Quote: 0
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Abstract


Flutter is a divergence of the self-excited vibration, it occurs mainly due to the vibration structure can be in the air flowing to continue to absorb energy , while the energy is greater than the energy dissipated by the structural damping in vibration caused . Nowadays, with the suspension bridge span is increasing its stiffness and damping significantly reduced, so the suspension bridge flutter stability has become the key issue in the design and construction of large - span suspension bridge . The main span 1418m Nanjing bridge engineering background in existing flutter frequency domain and time-domain analysis methods based on computational analysis and wind tunnel tests of long span suspension bridge flutter problem . This thesis work the following aspects : first reviewed the flutter analysis theory , and then bridge the two-dimensional three-dimensional multi- modal coupled flutter analysis theory , the use of numerical programming software for the preparation of a bridge between two-dimensional and three-dimensional flutter flutter analysis procedures , and a typical example to verify the correctness and reliability of the program , after the state the Nanjing Yotsubashi into bridge two-dimensional and three-dimensional flutter frequency domain analysis . Second, on the bridge structure pneumatic self-excited forces to deal with the problem in the time domain : the use of finite element theory , the self - excited forces role equivalent to the the additional pneumatic role in the structure of the stiffness matrix and aerodynamic damping matrix to achieve when the domain of self-excited force . Time domain analysis based on the finite element software bridge flutter , and verify the correctness and reliability of this method by a typical example , and then combined with the Nanjing Bridge , its flutter into bridge the state 's three-dimensional time-domain analysis . Third , Nanjing bridge engineering background , the bridge flutter testing methods described in detail in the wind tunnel to study bridge flutter characteristics critical flutter velocity and findings of the trial , while Van der Put flutter estimation formula approximate calculation of the critical flutter velocity . Then by using the tablet chatter vibration derivative and real bridge flutter derivatives , the use of frequency-domain and time-domain analysis method , to study the bridge flutter vibration critical wind speed with the structural damping ratio to stream wind attack angle change in the general law , to explore the flutter derivatives bridges the flutter Stability affect , get some meaningful conclusions .

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CLC: > Transportation > Road transport > Bridges and Culverts > Structural principles, structural mechanics > Bridge vibration and damping device
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