科研之友
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摘要
It was frequently reported that the bond-slip relationships at different locations along the bonded length are different, which can be illustrated as bond-slip location effect. In order to reveal the influence of this effect on the bond behaviour between glue laminated timber (glulam) and glued-in rod, a 3D finite element model considering bond-slip location function is developed for the glulam joints with glued-in rod in this paper. Moreover, an experimental program conducted on the glulam joints with glued-in rod is also presented. The numerical and experimental results are compared and discussed in terms of withdrawal capacity, typical failure modes, load-slip behaviour, strain development of glued-in rod and the interface shear stress distribution. It is indicated that the non-linear spring elements can be used to simulate the bond behaviour between the glulam and the glued-in rod effectively. The numerical results obtained considering the bond-slip location function are generally in better agreement with the experimental results compared to that obtained neglecting the bond-slip location function. Finally, the withdrawal stiffness of the glued-in rod glulam joints is evaluated by a theoretical approach based on the Volkersen theory. The withdrawal stiffness calculated by the proposed model shows good agreement with the experimental results, which confirms that the calculation model is effective for predicting the withdrawal stiffness of the glulam joints with glued-in rod.
