Effect of Posttensioning on Rotational Stiffness of Wood Joints

Abstract

The moment-rotation behavior of full-size Warren truss timber connections, using posttensioning as a possible reinforcement scheme, was investigated and compared with the current method of using gusset plates. Four joint configurations were tested using three posttensioning levels. The stiffness of the joints was calculated and is presented in this technical note. Based on the results of posttensioned joints and earlier experimental investigations, it was found that the increase in joint rotational stiffness, due to transverse posttensioning is a function of the number of connector rods in the joint zone for both inner (compression) and outer (tension) web members, and the increase in joint rotational stiffness due to transverse posttensioning is a function of the posttension level for outer (tension) web members.