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Title:Test Results from an Investigation of Parallel-Chord, Top-Chord-Bearing Wood Trusses
Author(s):Percival, Donald H.; Eberle, G.F.; Denny, John M.; Brakeman, D.B.
Building materials
Abstract:This report describes the results of 73 tests of top-chord-bearing, parallel-chord, metal-plate-connected wood trusses using various wood species, truss-plate sizes, and two different lumber orien-tations. The test units were separated into two phases, with Phase I including various replications as a pilot study for planning Phase II. Forty-six trusses were tested in Phase I. After an evaluation of the performances of these units, 27 trusses were designed for Phase II using other lumber species, more precise deflection measurement, and an up-graded plating design. The main objectives of the study were to provide information on deflection, shear strength, and bearing characteristics of these truss designs. An additional objective was to determine the effect of varying the gap between the inside edges of the bearing and the first vertical or diagonal web-members. The trusses were designed to put maximum stress on the heel joint. The tests showed that there are important additional deflection and force components resulting from the rotation of each end joint at the reactions. New design methodology and modeling are needed to reliably predict the performance of top-chord-bearing wood trusses.
Issue Date:1985
Publisher:Small Homes Council - University of Illinois Urbana-Champaign
Series/Report:Research Report 85-1
Genre:Technical Report
Rights Information:Copyright 1985 Board of Trustees of the University of Illinois
Date Available in IDEALS:2014-09-23

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