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Nailed wood joints under combined loading

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Summary

A new testing apparatus was designed and a test method developed to enable the application of axial loads, lateral loads, and controlled ratios of axial to lateral loads to nailed wood joints. The effect of axial load components on ultimate lateral load, joint deformations and several slip moduli were evaluated. These load-slip parameters were determined for three species of wood, three depths of nail penetration, and eight angles of load application.

Several basic equations were examined to quantitatively describe the effect of combined axial and lateral loads. These included Hankinson's formula, a modified stress interaction formula, and a semi-log curve fitting process.

Hankinson's formula proved to be a poor equation to describe the combined load effect, producing errors in excess of 500 percent in some cases. The stress interaction formula modified with a sine function produced an accurate method for describing ultimate load with errors below 15 percent. This is recommended as a design equation for nailed joints loaded in a combined manner. The use of a semi-log curve fitting process and a simple linear regression made it possible to describe the effect of axial load components on stiffness parameters of nailed joints.

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Authors and Affiliations

  1. Department of Forest and Wood Sciences, Colorado State University, Fort Collins, Col, USA

    A. Louis DeBonis (Research Assistant) & J. Bodig (Professor of Wood Science and Technology)

Authors
  1. A. Louis DeBonis
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  2. J. Bodig
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Additional information

The authors wish to acknowledge the National Science Foundation for financial support under NSF Grant GK-30853 entitled “A Rational Analysis and Design Procedure for Wood Joist Floor Systems” and the McIntire-Stennis Cooperative Forestry Research Program for additional financial support.

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DeBonis, A.L., Bodig, J. Nailed wood joints under combined loading. Wood Science and Technology 9, 129–144 (1975). https://doi.org/10.1007/BF00353391

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