Withdrawal capacity of threaded rods embedded in timber elements

In the present paper, the withdrawal capacity of threaded rods embedded in timber elements is investigated using both theoretical and experimental methods. A theoretical approach based on Volkersen theory, assuming a bi-linear constitutive law is developed. Moreover, an experimental investigation of withdrawal of threaded rods from glulam elements is presented. Results for specimens covering a wide range of varying embedment lengths and rod-to-grain angles are provided. The agreement between theoretical estimations and experimental results is good. A nearly linear relation between embedment length and withdrawal capacity, predicted by the theoretical approach, is validated by the experimental results.