A fastener such as a Nut and bolt, Or washer has a series of spikes or teeth on a bearing surface which is engageable with a workpiece. The spikes or teeth can grip the workpiece to lock the fastener against relative rotation with respect to the workpiece.
The NHERI TallWood project team is working on a full-scale shake table test of a two-story mass-timber building with resilient CLT rocking walls. The shaking intensity is 100% Northridge. They ran two of them back-to-back. The shear walls are the NSF vertically post tensioned rocking CLT wall.