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SOURCES OF NONLINEAR DEFORMATIONS IN LIGHT FRAME WOOD SHEAR WALLS

SOURCES OF NONLINEAR DEFORMATIONS IN LIGHT FRAME WOOD SHEAR WALLS. Rakesh Pathak, Ph.D., Software Research Engineer. PRESENTATION OUTLINE. Physical Description Simplified Deflection Formula Analytical Model Revisiting basics of Virtual Work Parametric Study Summary and Conclusions.

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SOURCES OF NONLINEAR DEFORMATIONS IN LIGHT FRAME WOOD SHEAR WALLS

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  1. SOURCES OF NONLINEAR DEFORMATIONS IN LIGHT FRAME WOOD SHEAR WALLS Rakesh Pathak, Ph.D., Software Research Engineer

  2. PRESENTATION OUTLINE • Physical Description • Simplified Deflection Formula • Analytical Model • Revisiting basics of Virtual Work • Parametric Study • Summary and Conclusions

  3. SHEAR WALL: DESCRIPTION

  4. SHEAR WALL: DEFLECTION FORMULA

  5. FINITE ELEMENT MODELING

  6. FINITE ELEMENT MODELING: NAIL PROPERTY

  7. VIRTUAL WORK: LINEAR APPLICATION • Virtual work is defined as the “work done by either virtual forces acting through real displacement or by real forces acting through virtual displacement”

  8. VIRTUAL WORK: NONLINEAR APPLICATION

  9. PARAMETRIC STUDY: DESCRIPTION • 8 ft x 8 ft • Nail Type • Nail Spacing • Panels • Frames • 36 combinations

  10. PARAMETRIC STUDY: NONLINEAR VIRTUAL WORK VERIFICATION

  11. PARAMETRIC STUDY: FRAME CONTRIBUTION

  12. PARAMETRIC STUDY: PANEL CONTRIBUTION

  13. PARAMETRIC STUDY: NAIL CONTRIBUTION

  14. PARAMETRIC STUDY: TOTAL DEFLECTION

  15. SUMMARY AND CONCLUSIONS • 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.

  16. SUMMARY AND CONCLUSIONS • 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.

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