Dissertation > Excellent graduate degree dissertation topics show

Plastic Limit Analysis of Shallow-spherical Shell under Normal Linear Distributed Load

Author: PanQiKe
Tutor: LiuDong
School: Chongqing University
Course: Engineering Mechanics
Keywords: Shallow spherical shells Generalized yield criterion SD effect normal linear distributed load Limit analysis
CLC: TU43
Type: Master's thesis
Year: 2009
Downloads: 50
Quote: 1
Read: Download Dissertation

Abstract


With a widespread application in civil engineering of the thin shell structures, it is important to confirm the limit bearing capacity of shells by taking plastic capability of materials into account.Based on the analysis of elastic stress distribution, the stress trajectory of shallow-spherical shell was gained, and a measure for choosing plastic format of shallow-spherical shell was suggested which has far meaning on choosing yield criterion reasonably.In the limit analysis of shells made of materials with no SD effect, the generalized yield criterion of axi-symmetric shell was educed based on Tresca criterion and analysis of stress distribution on cross section in limit states.Based on this yield criterion, the limit analysis of simply supported shallow-spherical shell under normal linear distributed load was launched, and the limit load of shell under different load as well as the corresponding internal force field and velocity field was calculated simultaneously.In the limit analysis of shells made of materials with SD effect, a dimensionless parameterη（0≤η≤1） was introduced to consider the transfer of neutral surface in plastic limit states. Combining with the Mohr-Coulomb yield criterion and the flow rule, the location of neutral surface in limit states can be confirmed. Then, limit analysis of SD effect shallow-spherical shell with normal linear distributed load was carried out by two measures called the lower-bound method and the upper-bound method, and the corresponding internal force field and velocity field as well as the orderliness of limit load to tension-compression ratioαwas obtained.All result draw the conclusion that the limit load had something with the type of load（k1、k2 ）, geometry character c2 and the tension-compression ratioαof shells. The type of load have great influence on limit load and this influence mainly lead by the effect on radial moment mr .And the limit load of shallow-spherical shell decrease with c2 increases, while increases whenαdecrease.

Related Dissertations

  1. Stability Research & Numeric Analysis of the Oblique Inserting Iron Tower Foundation,TU470
  2. Research on the Mechanical Behavior of Ice and Interaction Force Problem of Ice with Sea Structure,O346.1
  3. Carrying Capacity Finite Element Analysis of Piping Branch Junctions Based on Effect of Enhanced Plasticity,TB125
  4. On the Legal Legitimacy of Undercover Investigation and Its Regulation,D925.2
  5. Round shallow foundation bearing capacity limit analysis and numerical simulation,TU43
  6. Research of Rockmass Mechanics Parameter on the Overlying Rock Subway of Qingdao,U451.2
  7. Fractal Structure and Dynamic Instability Mechanism Research of the Tailing Dam in Xiadian Gold Mine and the Monitoring Early-Warning System,TV698.1
  8. Two-way eight-lane small clear distance highway tunnel support reaction force cap analysis support parameter optimization study,U451
  9. Rigorous Solution Method of Earth Pressure Against the Rotating Retaining Wall and Its Application,TU43
  10. Foundation under combined loading capacity of marine Numerical Analysis Method,TU470.3
  11. Steel Concrete Structures Research,TU398.9
  12. Investigation of Shallow Tunnel Stability Using Upper Bound Solution of Limit Analysis,U451.2
  13. Study on the Distribution of the Earth Pressure of Circular Pit,TU432
  14. Suction foundation analysis of three-dimensional limit,TU470.3
  15. Composite wind turbine blade design,TK83
  16. Plastic Limit Analysis Method Using Finite Element for High Loess Slope Stability,TU444
  17. Study on Bearing Capacity of Shallow Strip Footings,TU470
  18. Risk Analysis on Stability of Vertical Breakwater,U656.2
  19. Application of Strength Theory of Unsaturated Expansive Soil to the Limit Analysis,TU443
  20. The Study of Limit State for Jacket,TE952

CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Soil Mechanics
© 2012 www.DissertationTopic.Net  Mobile