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The Impacts of Creep Deformation of Long-span Prestressed Concrete Continuous Beam Bridges to Coupled Vibration Analysis of Train-Bridge System on High-speed Railway

Author: LuoHao
Tutor: GuoXiangRong
School: Central South University
Course: Bridge and Tunnel Engineering
Keywords: High-speed rail Large span Continuous beam bridge Train Time-varying systems Spatial vibration Creep deformation Stiffness Reasonable value
CLC: U441.3
Type: PhD thesis
Year: 2011
Downloads: 198
Quote: 0
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Abstract


Currently, countries such as Japan, France, Germany, the high-speed railway bridges usually mainly small and medium span, the main structure of the form simply supported beam and continuous beam, Charpy, continuous beam with strong integrity, Liang seam less, Liang end deformation Angular small, smooth track surface and high continuous beams used in high-speed rail span bridge has a strong competitive edge. Fully enclosed high-speed railway driving orbit with a high ride, and strictly Line Plane parameter limits, prestressed concrete bridge deck track irregularity due to the creep factor to ensure the deck OF TRACK must understand the creep deformation of the bridge to take the form of high-speed train track laying. In this paper, the Wuhan-Guangzhou Passenger Line four typical high-speed rail span prestressed concrete continuous girder bridge as the research object, on the large span prestressed concrete continuous beam creep deformation of high-speed trains out of shape effects. Made the following key findings: (1) large general-purpose software to calculate the four typical high-speed railway span prestressed concrete continuous beam bridge creep deformation and calculated and measured values ??are compared and analyzed. Box beam section (2) higher accuracy finite element method to establish a high-speed train bridge system dynamics model of four typical high-speed railway span prestressed concrete continuous beam bridge the detailed dynamics simulation analysis and calculation results show: in all calculation conditions, the power response of the four bridges are to meet the requirements; each car bodywork vertical, horizontal vibration acceleration to meet the limit requirements, the train driving safety and comfort to meet the requirements. (3) calculate the typical high-speed railway bridges creep deformation of the train take the form of calculation results show: When the high-speed train through the above four long span prestressed concrete continuous beam bridge late creep deformation of the bridge dynamic response minimal impact, did not cause a significant impact on the feasibility of high-speed trains to go from qualitative to the value of the high-speed train wheel load reduction, a certain degree of car body vertical vibration acceleration and vertical Comfort indicators increases. (4) analysis of large span prestressed concrete continuous beam bridge late allowable value of creep deformation, the analysis showed that: Ballastless track bridge specification under creep limit 10mm large span prestressed concrete continuous beam bridge can relax. (5) at home and abroad on the railway bridge stiffness evaluation criteria, according to China's national conditions, China's high-speed rail span bridge stiffness calculated to put forward concrete proposals and high-speed rail span prestressed concrete continuous beam stiffness reasonable value provide reference for the design and construction of similar structure.

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