Dissertation > Excellent graduate degree dissertation topics show

Theoretic Analysis and Experimental Research about Shear Lag Effect of Variable Cross-section Continuous Box Girder Bridge

Author: WangJun
Tutor: YanRenJun
School: Wuhan University of Technology
Course: Engineering Mechanics
Keywords: Shear lag 3-bar simulation method Finite element method ANSYS
CLC: U448.215
Type: Master's thesis
Year: 2008
Downloads: 142
Quote: 3
Read: Download Dissertation

Abstract


The box girders have been widely used in the bridge engineering beeause their beautiful extemal shapes, good behaviors and structural fucnetions, but they show the shear lag ornegative shear lag effete when symmetry bending loads act longitudinally. If the effect of shear lag is negleeted, high risks up to collapse of bridges may take place.This article take the soap city river especially big bridge as the object of study, with 3-bar simulation method, the scene empirical datum and the finite element method the bracket length increases a stage correspondence to the construction in the box Liang root to assign the section every time to cut stagnates the coefficient the distributed rule to carry on the analysis and the contrast research. First, elaborated the thin wall box beam shearing force lagging effect’s concept and the present solution shearing force stagnate the question three kind of main theories and the method: The analytic theory solution, the numerical solution, the model experiment, and have discussed these theories and the method serviceability and the limitation. Then, analyzed has bent under the load combined action the box Liang shearing force to stagnate the effect 3-bar simulation method governing equation, and boundary condition. Then, through on-site testing of experimental data plane finite element bridge structural design software GQJS9.6 on the primary beam theory of stress. Utilized general finite element analysis software ANSYS, the solid bridge’s characteristic which union this article used had determined the ANSYS model’s establishment and the analysis method, used in analyzing assign on the section the stress distribution.Through the above analysis, has drawn the following conclusion:(1)Selects arm’s box beam regarding the belt length, cuts stagnates the effect the influence to be not allow to neglect, carries on the bridge structure the spatial analysis is very essential.(2)In actual project, obtains the measured data receives many factors the influences, must avoid and reduce these factors the influence, guarantees the measured data real reliable.(3)Cuts looking from each construction stage stagnates the coefficient distribution map, also along with construction progress’s increase, after the abdomen, the roof intersection point cuts stagnates the coefficient changes first small, has increases, namely bracket box Liang is only exerting in the longitudinal pre-stressed muscle’s situation, increases after the bracket length cuts stagnates the effect to weaken first achieves a small value starts changes is getting more and more obvious.(4)In exerts the pre-stressed to the bracket structure in the situation, the box Liang root assigns on the cross section to cut stagnates the coefficient to lengthen along with the bracket displays already is not unceasingly obvious is cutting stagnates the effect, is also not obvious negative cuts stagnates the effect.(5)3-bar simulation method avoided the troublesome mathematics inferential reasoning, the computation load have been relatively few, the result was reliable, might take in the preliminary design the computational method, if further studied, might cause it to become the bridge standard the computational method.

Related Dissertations

  1. Research on the Structure and Characteristics of Permanent Magnetic Coupling,TH139
  2. Simulation Analysis on Temperature Stress of RCC Arch Dam and Its Construction Joints Design Research,TV642.2
  3. Analysis and Study of Abutment Stability in Concrete High Arch Dam by Three-Dimensional Nonlinear Finite Element Method,TV642.4
  4. The Effect of Current Density and Electric Field on Ni and Its Alloy Electrodeposition for Copper Crystallizer,TQ153.2
  5. Stability Analysis of Roller Compacted Concrete Gravity Dam Based on Time-history Method,TV642.2
  6. Broken walnut shell force testing and virtual prototype design of the main components of walnut sheller,S226.4
  7. Research on a Fire-fighting Shell for Towers,TU892
  8. Parametric Finite Element Analysis System Development of the Jib of Tower Crane Based on ANSYS,TH213.3
  9. Study of Modal Characteristics of a Car Body-in-White,U463.82
  10. The Design of the Interferometric Fiber-optic Microphone System Based on 3X3 Coupler,TN912.2
  11. The Surrounding Rock Monitoring and Finite Element Simulation of Subway Tunnel,U455.43
  12. Research of FBAR Temperature Sensor,TP212.11
  13. Numerical and Experimental Studies for Multi-Cracks of Asphalt Pavement with Semi-Rigid Basement Asphalt,U416.217
  14. The Study on the Influnce of Sub-splits Wire’s AC Corona Characristics under Different Climatic and Environmental Conditions,TM851
  15. Space hyperspectral imager Compensation focusing optical system of pre-,TH743
  16. Pipeline circumferential excitation calculation method of magnetic flux leakage,TG115.284
  17. Finite element analysis of gear transmission machine and Kinetics,TH132.41
  18. Pipeline Leakage Detection Technology within the magnetic axis,TH878.3
  19. Design and Fem Analysis of Mg Framework of Electric Bicycle,U484
  20. Lining the structure carrying capacity study tunnel fire,U451
  21. Wide dwarf tower cable-stayed structure parameters analysis and wide box girder shear lag effect,U448.27

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