A principles of mechanics model to predict the strength of wood structural panel portal frameshas been developed. The wood structural panel portal frame consists of a wood structural paneloverlapping a header to form a moment resisting connection to resist in-plane lateral loads. Theadvantage of portal frames is that they can resist relatively high lateral loads for a small wallwidth. The model is based on moment couples and shear strength of the components. Modelpredictions are compared to test results for a variety of portal frame constructions that have beentested. All portal frame walls were tested with the SEAOSC [1996] SPD cyclic load protocol forin-plane shear resistance.Portal frame constructions investigated in this study range from 16 to 24-inch wide, 8 to 10-fttall, sheathed with OSB or plywood, and with and without hold down devices at the base of thewall segment. Also investigated are portal frames built on raised wood floor assemblies withvariable base of wall restraint configurations which are modeled with moment couples.The model is compared to ten unique portal frame constructions that were tested. Comparingthe model to the test results shows that the model accurately predicts the strength to within about5% on average.
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