THE EFFECT OF DIFFERENT OVERLAP LENGTHS ON THE EFFICIENCY OF GLUED JOINTS IN TIMBER
Publication Date : 01/02/2009
The success of timber structures depends to a significant degree on the joint details employed. This paper reports the findings of an investigation on the effect of different overlap lengths on the efficiency of glued lapped joints in timber. Five different types of overlap lengths were fabricated as follows: 40mm, 60mm, gOmm, 100mm and 120mm using Afara species, a common wood type find in the tropics. The joints were subjected to static bending, compression and tensile stress tests in the direction parallel to the grain. The tests were carried out hi accordance to ASTM D143.94, (1994); NCP 2 (1973) and BS 373 (1997). The results of the test show that the efficiency of overlap joints increases in bending, compression and tensile loading as the length of overlap increases from 40 -120mm, but decrease in efficiency was noted after 100nun overlap length in tensile load test. This implies that efficiency of timber lapped joints increases with increase in the area of contact of the joint for betiding and compression loads but is limited to an extent in tensile load conditions.
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