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Analysis and Optimization of Seismic Performance of Cable-stayed Bridge

Author: AiChuang
Tutor: LiQingNing
School: Xi'an University of Architecture and Technology
Course: Bridge and Tunnel Engineering
Keywords: Cable-stayed bridge Computing model Dynamic characteristics Seismic Response Analysis
CLC: U442.55
Type: Master's thesis
Year: 2011
Downloads: 71
Quote: 0
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Abstract


Cable-stayed bridge is a kind of old and young bridge-type cable-stayed bridge in recent years because of its economic, aesthetic and span characteristics, all over the world quickly developed, with the society and the development of science and technology, the cable-stayed The bridge structure is from the Small Span to enter the long span and large span. The earthquake is one of the great natural disasters of hazards to human beings, more frequent seismic activity in recent years, the world, to ensure that the bridge is not destroyed in the earthquake, on the need for a cable-stayed bridge structure seismic design. Many domestic scholars have been actively studying the seismic performance of cable-stayed bridge, the background paper to an actual cable-stayed bridge projects through the large-scale finite element analysis software Midas / Civil, respectively, of the cable-stayed bridge the four structural system suspended system, semi-floating system, the tower beams consolidation system and rigid frame system eigenvalue analysis and seismic response analysis. The main content of the paper is as follows: 1. Explore the development overview of the cable-stayed bridge at home and abroad bridge seismic design of the status quo, the basic structure of the cable-stayed bridge tower, beams, piers connection by four structural system and their excellent shortcomings and cable-stayed bridge the three seismic response analysis method. Analysis and study examples of cable-stayed bridge, with a large-scale finite element analysis software were established space finite element model of the cable-stayed bridge four structural system. 3. Analysis of the dynamic characteristics of the cable-stayed bridge four structural system, learned through the analysis and comparison of the cable-stayed bridge with a very dense spectrum characteristics, dynamic characteristics of the system of four structural difference mainly in the top ten order modes by the suspension system the vibration period is significantly higher than the vibration period of the other three systems large it can be seen whether the set is connected between the tower and beam significantly influence the dynamic characteristics of cable-stayed bridge, the other due to the four structural system of the cable-stayed bridge Sarasota vibration appeared earlier, it should be appropriate to increase the stiffness of Sarasota. 4. Explore dynamic time history analysis of the seismic analysis of cable-stayed bridge, seismic response analysis of four different structural system and select the background of this thesis, cable-stayed bridge, through the analysis and comparison of the results to determine the The cable-stayed bridge seismic structural system is a semi-floating system, the system can be superior than the other three systems should take into account the deformation and internal force of the cable-stayed bridge, because the application. Cable-stayed bridge main viscous dampers. Supports of the cable-stayed bridge in the semi-floating system to its seismic performance optimization, through calculation and analysis under the same earthquake, viscous dampers beam longitudinal displacement is 45% smaller than not set the damper, the Sarasota the bottom shear and moment, respectively, 24% and 25%, respectively, to reduce the optimization.

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CLC: > Transportation > Road transport > Bridges and Culverts > Investigation, design and calculation > Bridge Design > Damage Analysis and Seismic Design
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