ULTIMATE STRENGTH OF TIMBER TRUSSES

Abstract

Timber Structures, as used in buildings, are of three main types (i) Beams, (ii) Trusses and (iii) Columns, Study has been made in this dissertation regarding the Ultimate Strength of Timber Trusses . with Nail-Joints. Analysis for secondary stresses is done for a nail-jointed timber truss considering nail-j oints as rigid. Effects of secondary joint moments upon the ultimate strength of a nail-.jointed timber truss are studied. It is found that the secondary moments do not have any effect upon the strength of a nail-jointed truss at ultimate load stage. Analysis is done for suitable grain alignments in the wooden gusset plates and it is found that the grains have a marked effect upon the ultimate strength of a timber truss. For the Heel gusset plates. horizontal grains along the axis of the tie member are recommended. Study is made regarding the mechanism of failure of a nail joint and it is found that the joint primarily fails due to yielding of nails in beAding, before large slopes are developed in the same.