Dissertation > Excellent graduate degree dissertation topics show

Varying analysis considering shear lag effects of variable cross-section PC cantilever box girder

Author: ChenLei
Tutor: HuDi
School: Central South University
Course: Civil Engineering
Keywords: Prestressed concrete box girder Variable cross-section Shear Lag Creep Reinforced constraint Finite Difference Method
CLC: U448.213
Type: Master's thesis
Year: 2011
Downloads: 21
Quote: 0
Read: Download Dissertation

Abstract


Uniform thin wall box in the form of long-span prestressed concrete beam bridge cantilever construction method is commonly used during the construction of box girder in the cantilever state more accurately predict cantilever box girder deformation and the stress control during the construction of linear and bridge after box Beam Alignment important basis to meet the design requirements. Prestressed concrete box girder concrete creep caused by beam deformation changes over time, will add additional deformation of the beam shear lag, therefore, consider shear lag affect the time-varying effect analysis has important engineering significance . Departure from the principle of energy and internal force equilibrium conditions, Prestressed concrete cantilever box girder considering shear lag, the rate of reinforcement, prestressing tendons stress relaxation creep effect for the in-depth study of the bridge cantilever construction method Guo the Chengzhong Liang body linear and concrete reinforced stress changes over time to provide ideas, with theoretical significance and value of the works. First, the use of energy variational method, derived considering reinforced impact shear lag control differential equations using finite difference method to get a variable cross-section cantilever box girder under dead load and pre-afterburner role stress, deflection and shear lag coefficient calculated expression . By the introduction of the time-varying concrete constitutive equation, any time sectional internal force balance equation and deformation compatibility conditions, combined with the shear lag calculations assume considering shear lag, concrete shrinkage and creep, stress relaxation of prestressing tendons with prestressed concrete tendons rate becomes variable cross-section cantilever box girder effect analysis methods, the establishment of a semi-analytical calculation of expression based on the finite difference method; based on the characteristics of analog cantilever construction method derive a set of time-varying effects can be applied to tracking the construction process of the cantilever method becomes Cantilever Box Girder formula. Finally, using the Matlab language programming of this method and formulas cantilever construction method Dongjiang Bridge during construction beam deformation and concrete stress, shear lag coefficient calculation and analysis, and the calculated results without considering shear lag effects of limited element software calculated the comparison shows that the established method varying effect of prestressed concrete cantilever box girder considering shear lag effects of variable cross-section formula can be derived considering shear lag, concrete creep and shrinkage, Deformation of prestressed tendons stress relaxation, reinforcement ratio of beam, concrete time-varying stress calculation.

Related Dissertations

  1. A Study on Thermal-Mechanical Damage Behaviour of 60Si2Mn Steel,TG142.15
  2. The Study on Structural Calculation and Analysis Method of Lattice-type Crane with Variable Cross-section Boom,TH21
  3. The Study on the Creep Resistance Property of Ultra-High Molecular Weight Polyethylene Fiber,TQ342.61
  4. The Research of Concrete Shrinkage and Creep Experiment,TU528
  5. Research on Adaptive Inverse Control for the Hysteresis and Creep Characteristics of IPMC,TP273.2
  6. Study on Process Method and Parameter Optimization of the Remained-heat Treatment of Marine Heavy Forgings,TG316
  7. Numerical Analysis Method and Application for Creep Damage of Asphalt Mixture,O346.1
  8. Uniform deformation laminate interlaminar stresses Numerical simulation and high-temperature creep behavior of 40Cr steel,TB33
  9. Elements Re nickel base single crystal alloy temperature creep behavior of,TG146.15
  10. GH4169G alloy creep behavior of the organizational structure and,TG146
  11. Experimental research of Beijing - Shanghai high-speed railway in deep soft soil section bridge foundation,U443.15
  12. The soft slate tunnel large deformation mechanical behavior and control technology,U451
  13. Six red River cable-stayed bridge overall performance and girders, towers local performance,U448.27
  14. Wide dwarf tower cable-stayed structure parameters analysis and wide box girder shear lag effect,U448.27
  15. High - pier long-span continuous rigid frame bridge construction linear control technology research,U445.4
  16. PC box girder creep effect analysis based on ANSYS secondary development,U448.35;U441
  17. Study on Deformation Control of Long-span Continuous Rigid Frame Bridge in Construction Stage,U448.23
  18. Pratical Method of Fundamental Frequency for Larhge Span Prestressed Concrete Girder Bridge with High Piers,U441.3
  19. Large Span Prestressed Concrete Continuous Rigid Frame Bridge Analysis and Construction Control of Long-term Practice of Deflection,U448.23
  20. Structural Stress Analysis of Small and Medium Span Expanded Bridge,U441

CLC: > Transportation > Road transport > Bridges and Culverts > All kinds of bridges > Bridge: Structure > Beam bridge > Box girder bridge
© 2012 www.DissertationTopic.Net  Mobile