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Rakesh Pathak, Ph.D.,Rakesh Pathak, Ph.D.,Software Research EngineerSoftware Research Engineer
SOURCES OF NONLINEAR SOURCES OF NONLINEAR DEFORMATIONS IN LIGHT FRAME WOOD DEFORMATIONS IN LIGHT FRAME WOOD SHEAR WALLSSHEAR WALLS
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Physical DescriptionSimplified Deflection FormulaAnalytical ModelRevisiting basics of Virtual WorkParametric StudySummary and Conclusions
PRESENTATION OUTLINE
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SHEAR WALL: DESCRIPTION
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SHEAR WALL: DEFLECTION FORMULA
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FINITE ELEMENT MODELING
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FINITE ELEMENT MODELING: NAIL PROPERTY
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• Virtual work is defined as the “work done by either virtual forces acting through real displacement or by real forces acting through virtual displacement”
VIRTUAL WORK: LINEAR APPLICATION
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VIRTUAL WORK: NONLINEAR APPLICATION
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• 8 ft x 8 ft
• Nail Type
• Nail Spacing
• Panels
• Frames
• 36 combinations
PARAMETRIC STUDY: DESCRIPTION
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PARAMETRIC STUDY: NONLINEAR VIRTUAL WORK VERIFICATION
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PARAMETRIC STUDY: FRAME CONTRIBUTION
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PARAMETRIC STUDY: PANEL CONTRIBUTION
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PARAMETRIC STUDY: NAIL CONTRIBUTION
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PARAMETRIC STUDY: TOTAL DEFLECTION
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• This paper presents nonlinear virtual work application study for the first time.
• Displacement contribution from framing elements is found to be nonlinear and not linear as specified in IBC.
• Displacement contribution from panels elements matches well with IBC.
• Displacement contribution from nails between finite element model and IBC. are found to be very different.
• Nails in finite element models were observed to carry more load compared to IBC specified Table.
SUMMARY AND CONCLUSIONS
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• IBC inelastic drift is found to be conservative for all the models when compared with Finite Element results.
• The parametric study shows some differences between IBC and finite element results
• Wood Diaphragm flexibility calculation may get affected in certain scenarios but further study is needed as similar differences there may offset the error in flexibility calculations.
SUMMARY AND CONCLUSIONS
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