Load Distribution on a Full-Scale Nailed-Glued Hip-Roof System

The objective of this study was to test a full scale hip-roof system to observe the performance of a nailed-glued hip-truss designed to support design loads. For this full-scale test, calibrated load cells were installed at the reactions of the truss to determine the percentage of design load carried by the hip-truss. The test data indicated that all of the assumed design load did not go to the hip-truss. State of the art includes at least six methods to design a hip-roof system (using ceiling joint). These are shown in this paper. Using these test results, three of these design methods would produce a truss that is under-designed and the other three at or overdesigned. Presently, truss designers do not consider the sheathing action and its contribution in reducing the percentage of load going to the hip-truss.

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