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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.

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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
Acknowledgments
  • AISC Faculty Fellowship Program
  • Professor Ben Schafer
  • The thin-walled structures research group at JHU
overview
Overview
  • Motivation
  • Cross-section stability
  • Design methods
  • FE parametric study
  • Strain Distributions
  • Ongoingwork
slide5

App. 1

AISC

Q-factor

AISI

Effective

Width

AISI

Direct

Strength

overview7
Overview
  • Motivation
  • Cross-section stability
  • Design methods
  • FE parametric study
  • Strain Distributions
  • Ongoing work
abaqus elements
ABAQUS elements

S4

10 elements

residual stresses
Residual stresses

Galambos and Ketter (1959)

material modeling
Material modeling

Barth, White, Righman, & Yang (2005)

local slenderness
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

results
Results

Columns

overview18
Overview
  • Motivation
  • Cross-section stability
  • Design methods
  • FE parametric study
  • Strain Distributions
  • Ongoing work
results19

Thicker

W36WI

x

Original

W36x233

x

W36x330

x

Thinner

Results

Pn, kips

Displacement, in.

deformed shape

Original

W36x330

Thicker

Web

Thinner

web

Deformed shape
membrane longitudinal stress

~ Zero

= Yield

Membrane longitudinal stress

Original

W36x330

Thicker

web

Thinner

web

membrane plastic strain

~ 10ey

~ Zero

Membrane plastic strain

Original

W36x330

Thicker

web

Thinner

web

slide23

3D

2D

slide24

x

x

3D

S4 - Element

slide25

2D Stress/Strain distributions

Thicker

flange

Thinner

flange

slide27

Equilibrium

Clear height

slide28

W14 FI: Strain Energy Distribution

Original

W14x233

Thicker

Thinner

slide30

W14 FR: Strain Energy Distribution

Original

W14x233

Thicker

Thinner

slide32

W36 FR: Strain Energy Distribution

Original

W36x330

Thicker

Thinner

slide34

W36 WI: Strain Energy Distribution

Original

W36x330

Thicker

Thinner

ongoing work
Ongoing work
  • Strain Distributions
  • Effective Areas
  • DSM for Structural Steel
slide37

Work continues…..

more at: www.ce.jhu.edu/bschafer/aisc