Experimental test of threaded steel rods glued-in hardwood with epoxy

Abstract

This paper summarizes test results of an experimental study on threaded steel rods epoxied into structural hardwood members. Two test campaigns were carried out. In the first one 36 test specimens of Tali sawn timber (Erythropleum ivorense) with threaded steel rods were tested. Tests arose from the need to evaluate the behaviour of this type of joint because of its use in the construction of hollow bars spatial mesh of laminated timber. Three anchorage lengths and two bar diameters were tested. Moreover, two different thicknesses of the glue line, 1mm and 3 mm, were investigated. In order to complement the first tests a new experimental study with 180 test specimens was carried out. In the second tests, double-sided pull-out tests of Spanish chestnut timber saw specimens were performed. Small diameter threaded steel rods (8, 10 y 12 mm) quality 8.8 (yield stress 640 MPa) were used. In the paper the most significant results of both test campaigns are summarized, as well as the comparison with the existing design formulae for of this type of union.