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

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Presentation on theme: "Strain Distribution in Locally Slender Structural Steel Cross-sections Seif, M., Schafer, B.W. Civil Engineering at JOHNS HOPKINS UNIVERSITY."— Presentation transcript:

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

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 Ongoing work

4 AISC definition of locally slender Motivation

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

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

13

14 LOCAL slenderness 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 c

15 LOCAL slenderness

16 Results Columns

17 Results Columns App. 1

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

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

20 Deformed shape Thinner web Original W36x330 Thicker Web

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

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

23 3D2D

24 S4 - Element 3D x x

25 Thinner flange Thicker flange 2D Stress/Strain distributions

26 2D Effective Area NO !!!!

27 Equilibrium Clear height

28 W14 FI: Strain Energy Distribution Thinner ThickerOriginal W14x233

29 W14 FI: Postulated Effective Width Distribution Thinner ThickerOriginal W14x233

30 W14 FR: Strain Energy Distribution Thinner ThickerOriginal W14x233

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

32 W36 FR: Strain Energy Distribution Thinner Original W36x330 Thicker

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

34 W36 WI: Strain Energy Distribution Thinner Original W36x330 Thicker

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

36 Ongoing work Strain Distributions Effective Areas DSM for Structural Steel

37 Work continues….. more at:


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