The construction of mass-timber structures have been increased in Canada due to the support that have been done by the wood industry and provincial governments in Canada. Although timber is sustainable construction material and is easily available, the use of mass-timber building was limited to low building heights due to its lightweight and relatively high flexibility. However, this height limit has been revised with the state-of-the-art studies that have been done recently. To take part in this contribution, this report has examined the behavior of tall-mass-timber building with CLT balloon shear wall and glulam moment-resisting frame (CLTW-GMRF) system. In a conventional reinforced concrete, usually, the shear-walls are designed to resists the entire lateral loading, while the moment-resisting frames (MRFs) barely designed to handle the gravity loads. However, studies showed that in addition to jointly supporting the gravity loading, MRFs interact with the walls and contributes in resisting the applied loads. This extent of the interaction is significant for tall buildings where the shear-walls are slender. Similar to the RC wall-frame system, timber frames in timber-based wall-frame systems have been designing for gravity loads only. There-hence, this report explores the potential interaction between the CLTW-GMRF building and provide design guideline for CLTW-GMRF system.
For the dual system, the proposed tasks are:
1. Consideration of 6-,10-,15- and 20- storey CLTW-GMRF systems.
2. Consideration of different moment proportions (50-50% and 60-40%) between the CLT shear-wall and GMRFs.
3. Consideration of seismic modification factors (Ro Rd) of 3, 4.5, and 6.
4. Validation of the appropriate ductility-related seismic modification factor using FEMA P695 procedure, with consideration of NBC2020 seismic hazard.