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Dynamical Behaviours Research of Continuous Bridge with Variable Cross-section Box Girder Combined with the Corrugated Steel Webs

Author: LiDongYi
Tutor: ZhouXuHong；DiJin
School: Chang'an University
Course: Bridge and Tunnel Engineering
Keywords: Bridge Engineering Corrugated Steel Box Girder Dynamic characteristics Response spectrum analysis Time history analysis
CLC: U441.3
Type: Master's thesis
Year: 2010
Downloads: 125
Quote: 1
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Abstract


Since 1987, France has completed the first girder bridge with corrugated steel webs-Cognac bridge, this new type of composite structure caused many scholars, thus contributing to its rapid development. At present, domestic and foreign scholars study the static properties of the corrugated steel webs, such as the structure of corrugated steel webs bending, torsion, shear and stability, the few studies on the dynamic performance of the structure. With girder bridge with corrugated steel webs widely used in the country, the design span is getting longer and longer, and in recent years, the frequent occurrence of the earthquake, which caused damage to a lot of bridges and other structural engineering, engineers urgent need to understand this The dynamic performance of the new structure, in order to improve the mechanical structure. This work was supported by the Shandong Provincial Science and Technology (2005Y017) and Communication Technology Project (200,706) funding, the dynamic performance of the continuous box girder bridge with corrugated steel webs variable cross-section combination start the study. Review of the structure and the mechanical characteristics of the change-section girder bridge with corrugated steel webs on the derivation of the equation of the bending vibration of the the general beam bridge structure, and the analysis of the dynamic characteristics of the bridge structure theory and analysis. Of two corrugated steel webs composite continuous box girder bridge prototypes using the finite element program ANSYS and MIDAS were established to of space entities with plates and shells, space beam finite element model, finite element dynamic characteristics of the bridge structure, including structural natural frequencies and mode shapes of features; continuous box girder bridges and a span smaller corrugated steel webs combination of variable cross-section by changing the number, thickness and location of the span size and diaphragms, to establish a series of finite element model to analyze changes in span and diaphragms variable cross-section of corrugated steel webs composite continuous box girder bridge dynamic characteristics of, and finally get the dynamic characteristics with the cross-section girder bridge with corrugated steel webs becomes Trail and diaphragms variation. Refer to the relevant regulatory requirements, the use of the MIDAS software, respectively, of variable cross-section of corrugated steel webs portfolio continuous box girder bridge seismic response spectrum and dynamic finite element analysis to study the new structure under earthquake force performance. The study found that such bridge-type earthquake, the main beam occurs mainly vertical bending and lateral bending deformation and lateral deformation and cross in the vertical bridge obvious to the moment, the main beam of the mid-span pier the fulcrum nearby at the force is very complex.

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