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Advances in Cold-Formed Steel Beams and Thin-Walled Structures: A Comprehensive Overview

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nikita
12 diapositives · 273 Views · Aug 01, 2014

This document showcases the significant developments in the testing and design of cold-formed steel beams and thin-walled structures, highlighting key contributions from CE graduates and undergraduates. Research includes experimental evidence for new design methods, finite element modeling, and parametric studies on flexural capacities and moment gradients. The work discusses the implications of distortional local effects and member optimization. Additionally, it features insights into advanced analysis techniques, reliability, and the evolutionary computation perspective in civil and structural engineering.

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  1. thin-walled structures research group Fall 2002 Ben Schafer

  2. 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

  3. 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

  4. 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

  5. collapse of thin-walled membersbadri hiriyur

  6. collapse of corrugated plastic pipe

  7. 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

  8. Stochastic post-bucklingjie li, prof. lori graham l/lc = 1 + ax + bx2 + …, V = lcV0 + (alcV0 + V1)x + (blcV0 + V2)x2 + …

  9. covered wooden bridgesdylan lamar (u of ark), erika stoddard, steve buonopane Pine Grove Bridge - Lancaster Co., PA Brown Bridge - Rutland Co., VT

  10. 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

  11. [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

  12. 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