Restraining engineering systems

The first step is to determine earthquake demand and calculate the restraint forces for all linear, floor-mounted and suspended components (NZS 4219:2009 sections 3.6–3.8). The next step is to design a restraint system for each component that has sufficient capacity to resist seismic forces.

A typical restraint system consists of one or more anchor points, braces or supports and connections to the building component.

Common terminology when describing restraint systems

Common terminology when describing restraint systems. (Note that a real component would not usually be restrained using all of these restraints at once.)

In this section: