1 / 37

Strain Distribution in Locally Slender Structural Steel Cross-sections

Civil. Engineering. at JOHNS HOPKINS UNIVERSITY. Strain Distribution in Locally Slender Structural Steel Cross-sections. Seif, M., Schafer, B.W. . Acknowledgments. AISC Faculty Fellowship Program Professor Ben Schafer The thin-walled structures research group at JHU.

terena
Download Presentation

Strain Distribution in Locally Slender Structural Steel Cross-sections

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Civil Engineering at JOHNS HOPKINS UNIVERSITY Strain Distribution in Locally Slender Structural Steel Cross-sections Seif, M., Schafer, B.W.

  2. Acknowledgments • AISC Faculty Fellowship Program • Professor Ben Schafer • The thin-walled structures research group at JHU

  3. Overview • Motivation • Cross-section stability • Design methods • FE parametric study • Strain Distributions • Ongoingwork

  4. AISC definition of locally slender Motivation

  5. App. 1 AISC Q-factor AISI Effective Width AISI Direct Strength

  6. Column curve

  7. Overview • Motivation • Cross-section stability • Design methods • FE parametric study • Strain Distributions • Ongoing work

  8. ABAQUS elements S4 10 elements

  9. Residual stresses Galambos and Ketter (1959)

  10. Material modeling Barth, White, Righman, & Yang (2005)

  11. Geometric imperfections

  12. Geometric imperfections

  13. Geometric imperfections

  14. LOCAL slenderness c W14FI:W14x233 with variable Flange thickness, varies Independently from all other dimensions W14FR:W14x233 with variable Flange thickness, but the web thickness set so that the Ratio of the flange-to-web thickness remains the same as the original W14x233 W36FR:W36x330 with variable Web thickness, but the flange thickness set so that the Ratio of the flange-to-web thickness remains the same as the original W36x330 W36WI:W36x330 section with variable Web thickness, that varies Independently from all other dimensions

  15. LOCAL slenderness

  16. Results Columns

  17. App. 1 Results Columns

  18. Overview • Motivation • Cross-section stability • Design methods • FE parametric study • Strain Distributions • Ongoing work

  19. Thicker W36WI x Original W36x233 x W36x330 x Thinner Results Pn, kips Displacement, in.

  20. Original W36x330 Thicker Web Thinner web Deformed shape

  21. ~ Zero = Yield Membrane longitudinal stress Original W36x330 Thicker web Thinner web

  22. ~ 10ey ~ Zero Membrane plastic strain Original W36x330 Thicker web Thinner web

  23. 3D 2D

  24. x x 3D S4 - Element

  25. 2D Stress/Strain distributions Thicker flange Thinner flange

  26. Effective Area NO !!!! 2D

  27. Equilibrium Clear height

  28. W14 FI: Strain Energy Distribution Original W14x233 Thicker Thinner

  29. W14 FI: Postulated Effective Width Distribution Original W14x233 Thicker Thinner

  30. W14 FR: Strain Energy Distribution Original W14x233 Thicker Thinner

  31. W14 FR: Postulated Effective Width Distribution Original W14x233 Thicker Thinner

  32. W36 FR: Strain Energy Distribution Original W36x330 Thicker Thinner

  33. W36 FR: Postulated Effective Width Distribution Original W36x330 Thicker Thinner

  34. W36 WI: Strain Energy Distribution Original W36x330 Thicker Thinner

  35. W36 WI: Postulated Effective Width Distribution Original W36x330 Thicker Thinner

  36. Ongoing work • Strain Distributions • Effective Areas • DSM for Structural Steel

  37. Work continues….. more at: www.ce.jhu.edu/bschafer/aisc

More Related