As of 2024, there is only one CLT-based lateral system (CLT shear wall, with height limit of 65 ft) recognized by ASCE 7 seismic provisions. For tall mass timber buildings, no prescriptive mass timber lateral system is currently available for designers. This means that tall wood buildings will have to adopt a steel or concrete lateral system unless the design team elect to take the alternative system approach (PBSD), which unavoidly increases cost of such a design. This project is aimed at changing this situation by introducing the mass timber rocking wall lateral system into ASCE 7.
We will conduct a FEMA P-695 study to identify the seismic design parameters of the mass timber rocking wall system. Then a code-change proposal will be prepared and submitted to the Provision Update Committee of BSSC to be considered for the next update of ASCE7.
The project will be led by KPFF and Colorado School of Mines, sponsored by the Charles Pankow Foundation and USFS Wood Innovation program.