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An investigation in the reduction of tabulated loads for bolted joints fabricated of green Douglas fir

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  • Design
  • Engineering


Because of restrictions and shortages of materials and labor caused by World War II, the lumber industry has been forced to place on the market a great deal of lumber that is in a green condition. Consequently designers and engineers have been required to make use of this material. Specifications currently being used for the design of bolted joints in wood structures require that the allowable loads as tabulated therein be reduced when the material used is green. In most cases this reduction is in the order of two thirds the tabulated value, that is to say the allowable working stress is one third the tabulated value. The conservativeness of this requirement has been questioned and it has been the purpose of this investigation to attempt to arrive at a load reduction ratio which would give a greater allowable load and a subsequent saving in labor and materials.

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