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thin-walled structures research group. Fall 2002 Ben Schafer. Jack Spangler Jim Kelly Cheng Yu …most of the CE Grads Sam Phillips Liakos Ariston Tim Ruth Andrew Myers …other CE undergrads Michael Manness, Jr. Testing of cold-formed steel beams. Cold-formed steel beams cheng yu.

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Testing of cold formed steel beams

Jack Spangler

Jim Kelly

Cheng Yu

…most of the CE Grads

Sam Phillips

Liakos Ariston

Tim Ruth

Andrew Myers

…other CE undergrads

Michael Manness, Jr.

Testing of cold-formed steel beams


Cold formed steel beams cheng yu
Cold-formed steel beamscheng yu

  • Testing

    • first tests with definitive separation of modes

    • upper and lower bound flexural capacities

    • experimental evidence for new design methods

  • FE Modeling

    • parametric studies

    • moment gradient effect

    • influence of restraint

  • Significant design impact

Distortional

Local


Ea ga and member optimization sam phillips
EA/GA and member optimizationsam phillips

Special: 2 hour “Short Course”

Thursday September 26, 2002

1:00pm to 3:00pm

Shaffer Hall Room 101

Evolutionary Computation and Civil/Structural Engineering:

A Look Back and a Look Forward

Assoc. Prof. Chris Foley Marquette University




Generalized beam theory puneet bajpai
generalized beam theorypuneet bajpai

  • Unifies the conventional theories

  • Better understanding of structural principles

  • Economical method of analysis

  • Capability to consider individual buckling modes and select combinations of them

  • Applicable to linear analysis (First-order GBT), linear stability analysis (General second-order GBT), or bifurcation problems

Basic equation of second-order theory :

where, E = Young’s modulus, G = shear modulus,

= generalized deformation in mode k

= section properties applicable to mode k,

= distributed load applicable to mode k,

= three dimensional array of second-order terms, which includes coupling terms


Stochastic post buckling jie li prof lori graham
Stochastic post-bucklingjie li, prof. lori graham

l/lc = 1 + ax + bx2 + …,

V = lcV0 + (alcV0 + V1)x + (blcV0 + V2)x2 + …


Covered wooden bridges dylan lamar u of ark erika stoddard steve buonopane
covered wooden bridgesdylan lamar (u of ark), erika stoddard, steve buonopane

Pine Grove Bridge - Lancaster Co., PA

Brown Bridge - Rutland Co., VT


Reliability and advanced analysis steve buonopane prof tak igusa
Reliability and advanced analysissteve buonopane, prof. tak igusa

Ziemian frame testbed problem

Strength at first plastic hinge

no correlation

to ult. strength

Ultimate Strength (via Adv. Anal.)

Failure probability estimation


Solver efficiency for reliability and optimization zailong wan prof dan naiman prof tak igusa

[Kt]=

Solver efficiency for reliability and optimizationzailong wan, prof. dan naiman, prof. tak igusa

building realization(s)

input

building

basic geom.

basic loads

perf. criteria

deterministic response study

seek efficiency through

{F}=[Kt]{d}

topology

  • symm.

  • pos-def.

  • sparse

  • topology unchanging

MASTAN

interface


Wind on low rise buildings prof nick jones
wind on low-rise buildingsprof. nick jones

Hurricane Loss Reduction

Wind and Structural Engineering Initiative

through

National Institute of Standards and Technology

Building and Fire Research Laboratory

Gaithersburg, Maryland