Ch 1. Stress and Strain Multimedia Engineering Mechanics NormalStress Shear andBearing Stress NormalStrain Hooke'sLaw ThermalEffects IndeterminateStructures
 Chapter 1. Stress/Strain 2. Torsion 3. Beam Shr/Moment 4. Beam Stresses 5. Beam Deflections 6. Beam-Advanced 7. Stress Analysis 8. Strain Analysis 9. Columns Appendix Basic Math Units Basic Equations Sections Material Properties Structural Shapes Beam Equations Search eBooks Dynamics Fluids Math Mechanics Statics Thermodynamics Author(s): Kurt Gramoll ©Kurt Gramoll

 CASE STUDY INTRODUCTION Introduction Truss Secured with Wood Dowel Pins A carpenter is using wood dowels to secure three wood members to form a truss. The truss will span 6 ft and must hold a snow load of 50 lb/ft2. The dowels will experience a shear stress and the dowels will push against the truss member causing a bearing stress. What is known: Each truss member is a 1x2 wood board (nominal size 1" x 2"). Actual dimensions are 3/4 inch by 1 1/2 inch. Trusses are spaced every 2 ft along the roof. The dowel is made from Douglas Fir wood and has a diameter of 1/2 inch. Wood dowel is centered on the wood truss members. Questions What is the shearing stress in the 1/2" dowel at the top of the wall due to the load in the top truss member? Also, what is the bearing stress in the top truss member at the top of the wall? Approach First, find the load in the top truss member using basic static equilibrium. Use shear stress equation      τ = V/A Use bearing stress equation      σb = P/Ab

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