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Paper Information

Journal:   RENEWABLE NATURAL RESOURCES RESEARCH   SUMMER 2016 , Volume 7 , Number 2 (SERIAL NUMBER 24) ; Page(s) 15 To 24.

An Evaluation on the Shear Resistance of Joint Trusses

Author(s):  Lashgari Amir*
* Department of Wood and Paper Science, Karaj Azad University, Karaj, Iran
The present research analyzes the effect of fibers direction of joint parts in two directions (tangential directional and radial directional), the type of surface joint parts (joint type) in three models (gradient, step like, Persian freestanding), and the type of metal gasket of two shape (separate globular and one piece common) on the shear resistance of joints in wood trusses. In order to make the joints we used populous nigra of two kinds each one of them with the dimension of 5. 1 × 5. 1 × 30 centimeter. In order to connect the joints we used two standards ASTM D 1761-88 R95 bolts with the diameter of 10 mm and we did not use any glue. Combining upcoming variables 12 treatments have been created and considering 4 repetition 48 truss joint samples created totally, and their Shear resistance have been evaluated with the mechanical examination device. According to the findings of the study the maximum resistance in all samples is of the gradient joint in radial direction with separate metal gasket. Interaction of fibers direction and the type of surface joint and also the interaction of two factors, the type of metal gasket and the type of surface connection is meaningful. Shear resistance increased in radial direction and common metal gasket and also among the types of surface joints, gradient joint has the maximum shear resistance.
Keyword(s): Fibers direction,Joints,Metal gasket,Shear resistance,Truss
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