2019 CSCE Annual Conference - Laval (Greater Montreal)

2019 CSCE Annual Conference - Laval (Greater Montreal) Conference

Investigation of Joint Shear Panel in Post-tensioned Timber Frames

Dr. Asif Iqbal, University of Northern British Columbia
Mr. Ahmad Rahmzadeh, The University of British Columbia (Presenter)

Structural frames made of prefabricated laminated timber beams and columns connected by unbonded post-tensioning have been developed for multi-story timber buildings. Prefabricated post-tensioned timber members can be designed to have excellent seismic resistance with the post-tensioning providing re-centering during seismic motions. This paper presents the stresses and deformations within shear panels of timber beam-column joints based on findings from numerical models. The joint was designed as a part of a moment-resisting frame for a six-story timber building located in a high-seismic region. The beams and columns were fabricated from laminated veneer lumber (LVL). Detailed Finite Element (FE) models of various arrangements are developed and verified against experimental data. The results show that the joints armored with steel plates at column faces exhibited higher stiffness and smaller deformation in compression perpendicular to the grain. The joint region with reinforcements in the form of embedded long screws experienced reduced crushing of the column and the subsequent drop in prestressing forces in the system. Combination of armoring and reinforcements protects the joint region through minimizing joint shear panel deformation. The numerical models predict the behavior of different types of beam-column joints accurately and can be utilized to design similar connections.