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Seismic Response Analysis of Long-span Cable-stayed Bridge under Multi-support Excitation

Author: CuiPengJu
Tutor: GaoDaFeng
School: Xi'an University of Architecture and Technology
Course: Bridge and Tunnel Engineering
Keywords: Long Span Bridge Dynamic characteristics Pile ─ soil - structure interaction Seismic Response Analysis Traveling wave effect
CLC: U441.3
Type: Master's thesis
Year: 2010
Downloads: 115
Quote: 0
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Abstract


Large span cable-stayed bridge is a very wide range of applications in the Modern bridge a bridge type, it is a system composed of cable supported by the main tower, beam and cable-stayed three basic components. Such bridge is passed by cable beam load to Pylon its flexibility to be much larger than the bridge line, the dynamic characteristics of the cable-stayed bridge is very different from the ordinary bridge really need to study, explore. This article to the construction of a good three towers four-span cable-stayed bridge engineering background to analyze and study the dynamic response of the earthquake, to provide a reference the oblique bridge seismic design and construction of the building and detection reinforcement. This paper work done and conclusions are as follows: (1) to collect seismic data, including seismic classification, characteristics and hazards of earthquakes; characteristics analysis to study the large-span cable-stayed bridge, the study of this type of bridge type design need consider this research priorities - large span cable-stayed bridge seismic response analysis method; Recalling the the bridge specification development and design improvements, the final response spectra for seismic design of three methods: method, time history analysis method and random vibration theory methods focus were discussed. (2) the seat of three towers, four-span cable-stayed bridge, with a the MIDAS software finite element analysis model, separately considering pile - soil - structure interaction (Model A) and does not consider the pile - soil - structure interaction (model B) Both conditions model modal analysis, and draw some conclusions: two conditions, less than the frequency of the Model A Model B frequency; same characteristics in the low-order modes, model A and model B vibration ; consider pile - soil - structure interaction the structure occurred mainly in the higher modes stages. (3) through a horizontal design acceleration response spectrum curve, still these two conditions, the dynamic characteristics of the model numerical simulation analysis, the result of this interaction the impact of large-span cable-stayed bridge is limited, especially on the axis no significant effect of the force and displacement. (4) non-uniform excitation Bridge. Multi-displacement cross-section in the beam and pier top displacement increases pier axial force and short pier shear and bending moment on the pier investigated obvious incentive to make the bridge. (5) Block the Three Pagodas four-span cable-stayed bridge seismic response time history analysis. Through a multi-point excitation with uniform excitation comparison analysis, seismic multi-point excitation, the cable-stayed bridge the internal force, displacement indicators increase. Traveling wave effect must be considered in the design of cable-stayed bridge is the traveling wave effect anywhere vibration input direction different. (6) of this work done, do a brief review and proposed some recommendations views on the basis of the study.

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