Seismic Bracing Design

Earthquake protection with sway brace for building services: MEP systems, ductwork and pipework that stay in place when it matters

Earthquakes cause hazards no site can design away — but the mechanical, electrical and plumbing (MEP) systems that keep a building running can be protected from what an earthquake does to them. That is, non-structural components require seismic protection of their own, separate from the building’s structural design.

Acrefine’s seismic design and calculations are exactly that: Seismic protection built into your building services, keeping equipment and systems in place during an earthquake and transferring seismic forces safely into the structure, so your building services survive the event as well as the building itself.

Two objectives, every time

Every seismic bracing is essential, and we do this around two objectives:

  • Keep component movement within defined limits. Ductwork, pipework, cable trays and mounted equipment are restrained so that displacement during a seismic event stays inside the tolerances the system and its connections can safely absorb.
  • Transfer seismic loads safely into the structure. Restraint only works if the loads it generates are carried predictably into the building structure — so every design accounts for where those loads go and what the structure needs to receive them.

That combination — controlled movement plus a clear load path — is what separates real seismic restraint from hardware that’s simply bolted on and hoped for the best.

Seismic cable bracing, done right

Where the geometry allows it, flexible cable bracing is often the more efficient choice. Cable systems absorb seismic movement without the stiffness — and cost — that rigid bracing carries. Rigid braces have to be checked for buckling under compressive load, which adds calculation, hardware and installation cost that a correctly specified cable system can avoid. We assess, on a case-by-case basis, which approach suits the equipment, the span and the load path — not which one is easiest to specify.

Proper seismic design: We won’t brace what doesn’t need it

Not every mounted component needs bracing. Equipment on steel trapeze mounts, or on short-rod hangers below a defined length threshold, frequently falls within limits that don’t require additional restraint under the applicable code. We check this before we design anything — so you’re not paying for bracing hardware, drawings and installation labour your project doesn’t need. It’s a small step that has a direct effect on your project’s cost, and it’s one of the reasons clients keep coming back to us.

Wire-rope seismic bracing restraining red fire-protection pipework beneath a concrete soffit

Acrefine’s seismic bracing system offerings for building services

  • Overturning calculations for mounted and freestanding equipment
  • Bracing calculations for ductwork, pipework, cable trays and equipment supports
  • Assessment of where bracing is — and isn’t — required, to avoid unnecessary cost
  • Detailed installation drawings for site use
  • Layout drawings showing restraint locations across the building services scope
  • Bracing calculations for fire sprinkler and standpipe piping, to NFPA 13’s seismic provisions

Fire sprinkler systems fall inside this scope too. Sprinkler systems and standpipe piping carry their own seismic bracing requirements under NFPA 13 — fire protection scope we handle directly, as part of the same design package, rather than as a separate job.

Building Codes for Nonstructural Systems and Fire Sprinkler Systems

Our seismic bracing design work for building services is carried out to IBC, ASCE 7, NFPA 13 and Eurocode 8, matched to the code jurisdiction your project falls under. For sprinkler and fire protection scope beyond bracing, see our fire safety engineering service.

What seismic bracing does — and doesn’t — do

Seismic bracing keeps a component in place and carries the seismic loads it generates safely into the structure. It does not, by itself, prove the component’s internal integrity or its functionality after the event — those are separate questions, answered by analysis or testing. See our seismic calculations for equipment service for that side of the work.

Get in touch: Our engineers are here for your seismic protection

Working on a project with seismic bracing design requirements for building services? Contact us to talk through your scope — or browse our seismic bracing hardware if you’re sourcing components rather than a design service.