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The Seismic Response Analysis of Long-span Cable-stayed Bridge under Different Patterns of Earthquake Excitations

Author: DingLan
Tutor: ZhangXieDong
School: Wuhan University of Technology
Course: Roads and bridges to cross the river engineering
Keywords: Long Span Bridge Dynamic characteristics Response spectrum Dynamic time history analysis Traveling wave effect
CLC: U441.3
Type: Master's thesis
Year: 2011
Downloads: 89
Quote: 0
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Abstract


The earthquake is a tremendous destructive power, and because they are difficult to predict natural disasters, especially large span cable-stayed bridge seismic damage usually brings a huge loss of life and property. Therefore, such bridge seismic system, a comprehensive study has important theoretical value and practical significance. Existing bridge seismic research at home and abroad on the basis of vibration analysis theory based on long-span bridges, elaborated on the evolution of the bridge seismic analysis methods to analyze the advantages and disadvantages of the various methods, and the response spectrum method and dynamic time history analysis method to Inner Mongolia Little Haven Yellow River bridge engineering background, conduct in-depth study of the twin towers and double cable plane cable seismic response, mainly include the following aspects: (1) the use of large-scale finite element program ANSYS, the establishment of a full-bridge three-dimensional dynamic finite element analysis model to analyze the dynamic characteristics of the small sandy Yellow River Bridge, its natural vibration characteristics, in line with the characteristics of the semi-floating system of cable-stayed bridge. (2) based on the vibration characteristics of the cable-stayed bridge, seismic waves along the vertical, horizontal, vertical and three dimensional vibration input response spectrum analysis were unanimously excited linear dynamic analysis of the two sets of results for comparison. The more obvious differences, the results calculated by the two methods for calculating the safe side, the small sandy Yellow River Bridge seismic response analysis should be two methods combined, comprehensive trade-off in order to get satisfactory results. (3) Based on the nonlinear characteristics of the cable-stayed bridge in the ground motion acceleration time input geometry, uniform excitation nonlinear seismic dynamic response analysis. By comparison with the linear seismic dynamic time history analysis results show that the geometric nonlinearity great influence on the dynamic response of large-span cable-stayed bridge, geometric nonlinearity must be taken into account in the actual large span cable-stayed bridge seismic analysis. (4) based on the structure of power equation in the multiple support excitation using massive acceleration of time into time history of the force applied at the supports considering traveling wave effect time history response analysis of the structure; and structure reaction consistent incentives compared, traveling wave effect on the seismic response of the cable-stayed bridge with seismic waves arrive difference is closely related to the time of the two towers. (5) study the structure of the elastic modulus, pile - soil - structure interaction, the different damping calculation mode and the mode number of combinations of the seismic response of the cable-stayed bridge and its variation, the analysis shows that structural seismic response range endanger the safety of the structure due to changes in the structural parameters are not the same, but the degree of the impact of the law and the impact of various parameters to provide a reference for the seismic design and analysis of large span cable-stayed bridge. The law in this article can be used as a small sandy Yellow River Bridge seismic design basis for other similar bridges seismic analysis and damping design also has certain reference value.

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