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Research Papers

Postyield Cyclic Buckling Criteria for Aluminum Shear Panels

[+] Author and Article Information
Sachin Jain

Department of Civil Engineering, Indian Institute of Technology Kanpur, Kanpur 208 016, Indiajainsachin11@gmail.com

Durgesh C. Rai1

Department of Civil Engineering, Indian Institute of Technology Kanpur, Kanpur 208 016, Indiadcrai@iitk.ac.in

Dipti R. Sahoo

Department of Civil Engineering, Indian Institute of Technology Kanpur, Kanpur 208 016, Indiadiptirs@iitk.ac.in

1

Corresponding author.

J. Appl. Mech 75(2), 021015 (Feb 26, 2008) (8 pages) doi:10.1115/1.2793135 History: Received December 14, 2006; Revised July 30, 2007; Published February 26, 2008

Aluminum shear panels can dissipate significant amount of energy through hysteresis provided strength deterioration due to buckling is avoided. A detailed experimental study of the inelastic behavior of the full-scale models of shear panels of 6063-O and 1100-O alloys of aluminum is conducted under slow cyclic loading of increasing displacement levels. The geometric parameters that determine buckling of the shear panels, such as web depth-to-thickness ratio, aspect ratio of panels, and number of panels, were varied among the specimens. Test results were used to predict the onset of buckling with proportionality factor f in Gerard’s formulation of inelastic buckling. Moreover, a logarithmic relationship between buckling stress and slenderness ratio of the panel was observed to predict experimental data closely. These relations can be further used to determine the geometry of shear panels, which will limit the inelastic web buckling at design shear strains.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Details of parameters used in Gerard’s buckling criterion: (a) shear deformation of shear panel and (b) definition of secant shear modulus Gs and inelastic shear strain γ¯b

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Figure 2

Stress-strain curves of unannealed and annealed aluminum alloys used in this study

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Figure 3

Details of test specimens: (a) two-paneled specimen (b) three-paneled specimen

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Figure 4

Test setup with locations of LVDTs and strain gauges

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Figure 5

Displacement (or strain) history

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Figure 6

Hysteretic response and buckled configurations of test specimens with varied number of panels, type of alloy, and web width-to-thickness ratio

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Figure 7

State of test specimens before and after the testing: (a) two paneled specimen and (b) three-paneled specimen

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Figure 8

Experimental relationship between Gs∕G and η

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Figure 9

Log-log plot between slenderness ratio and inelastic shear buckling stress

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Figure 10

Comparison of shear buckling stress curves

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Figure 11

Buckling matrix of aluminum shear panels up to 15% strain

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