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The Seismic Response Spectral Analysis of the Large Span Highway-railway Cable Stayed Bridge

Author: WangXiaoJun
Tutor: ZuoWeiLian
School: Wuhan University of Technology
Course: Structural Engineering
Keywords: highway -railway cable-stayed bridge equivalent modal damping ratio long period response spectrum response spectral method
CLC: U441.3
Type: Master's thesis
Year: 2006
Downloads: 308
Quote: 5
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Abstract


It is well know,in general,that the long — span bridge is the hinge of transportation system and the important component of lifeline project. In the earthquake, the damage of the bridge project will lead to the traffic disruption, which makes the disaster-relief work difficult or substantially delayed and the secondary disasters enhanced more greatly, and result in huge economic losses. At the same time, because of the characteristics of the beautiful appearance, low cost and good mechanics performance of the cable-stayed bridge, it is liked by the engineers more and more and develops rapidly with the development of the national economy. With the growing size of the cable-stayed bridge, the seismic response of the cable-stayed bridge becomes more and more important and sometimes plays a decisive role. Therefore, the seismic response analysis of the large span cable-stayed bridge is necessary. Tianxinzhou Bridge in Wu Han city is a highway -railway cable-stayed bridge with twin towers and three cable plane and the main span of 504m and the full-length of 1092m.Because of its complex structure, unique structure system and important geographical location, the seismic response analysis is very important and significant.On the basis of the study achievements at home and abroad, the paper set Tianxinzhou Bridge as the project background and the ANSYS structural analysis procedures and the spectral analysis theory are both used to calculate the seismic response and the seismic response laws of the bridge are obtained.Firstly, after introducing the spectral analysis theory of the large span bridge structure, the dynamic calculation model of Tianxinzhou Bridge is developed with ANSYS and the dynamic properties are obtained through modal analysis.The damping ratio of the overall structure of Tianxinzhou Bridge is unknown, because the structure of the bridge is composed by reinforced concrete structure and steelwork structure. For the purpose of considering the effect of damping ratio to the spectrum value and predicting accurately the seismic response, before the seismic response analysis, the paper gained the equivalent damping ratio of the overallstructure of Tianxinzh Bridge within real number by the use of the relation between the plural frequency and hysteretic damping factor and the theory that the plural frequency is equivalent before and after equivalence.Based on the above, according to the features of Tianxinzh Bridge, we choose the suitable standard response spectral curve and damping-modified formula and modified the response spectral curve. Inputting the modified response spectral curve along the longitudinal, transverse, vertical and multidimensional direction, we analyse the seismic response of Tianxinzhou Bridge and compared detailly the seismic response laws for two work conditions which are damping-modified and unmodified and gained the corresponding conclusions .Finally, the work in this paper is summarized and some conclusions about the study are drawn, besides, the further research problems are indicated.

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