1. What factors affect the key design and installation principles for seismic

restraints.

2. Who should design, install and certify these systems?

101 in seismic restraint principles.

NCC (BCA) Called up since 2010, AS1170 Part 4 is mandated (w/o exemptions) for all Class 2-9 buildings (except IL1) and Residential (1a & 1b) over 8.5m.

AS 1170.4 - 2007 (R_2018) Section 8 Parts & Components: Provides guidance on earthquake actions for architectural, mechanical, electrical and hydraulic parts and components.

Google(v): Earthquake load design + ABCB or QBCC

EQ

Vulnerability for:

• Life-safety

• Egress (exit)

• Ingress (rescue)

• Business Continuity (BAU)

• Recovery Rate

AS1170.4 :2007 s8.1.4 (b) - sans exemptions s8.1.4 (b) (xviii)

• Exemptions outlined in AS1170.4 Section 8.1.4(b)(xviii) require SED knowledge, although the following is noteworthy:

• The exemptions only apply to IL2 & IL3 structures, with IL4 requires Special Study.

• The exceptions only apply to 'individually supported services’.

• Straight run of service should remain restrained if beginning – ie no exemption @ changes in size, drop, etc.

• Where below threshold items are supported on a trapeze or multi service hanger exemption is no longer valid

NCC 2019 Amendment 1 Volume 1 B1.2

Serviceable - Useable, Functional

Immediate - Within 20-30 Minutes

Use - Post Disaster Critical Functions

AS1170.4 :2007 Table 2.1 Note 4

* In accordance with ISO 22301:2012 Societal security – Business continuity management systems – Requirements, or similar, incorporating:

Process for outputs1) Business Continuity*2) Special Study3) Design4) Validation

nRAH Example:

• AS1170.4 Design Considerations

• Probability Factor - kp

• Geographical Location – Hazard factor Z

(min kpZ =0.08)

• Site Subsoil Type Ch(0)

• Building height - ax = 1+kchx

(When we design we also look into the below factors that minimises/helps distinguish whether the components we are assessing needs bracing)

• Component Importance Factor - Ic

• Properties of the Component – ac / Rc (amplification/ductility) (Mounting)

• Components Weights - Wc

• Attachment Point/Hanger Height/Plenum depth

• Spacing Between Supports/Hangers

• Structural engineer designs the structure (holds EQ knowledge)

• Services Engineer designs the services attached to the structure.

Service Engineer /

Architect

Builder

InstallerCertifier

Structural Engineer

Should provide clear Specifications for SeismicIf full design drawings they are fully responsible for calculations and seismic bracing layout designdocumentation.Specification should include cost estimates from tenderers – based upon compliant documentation

Deliver compliance build.Hold liability, with claims to include seismic certification.

Structural Specification holds design data for SeismicSection 8 – but usually non-structural is out of their scope

Last line of defence. This must be made clearer through documentation from all parties.

Contracted to deliver clear outcomes: Seismic has been communicated, reinforced, itemised, coordinatedIf D&C project they are fully responsible for calculations and seismic bracing layout design documentation

Seismic Engineer defines locations.

General rules of bracing - Unless exempted, all building services shall be braced:

• When penetrating walls/soffits/floors (unless Seismic Engineering Designed)

• Both sides of flexible connections for piping, conduit or ductwork.

• To avoid collisions between piping, conduit or ductwork and adjacent other non-structural components

• Within 600mm of changes in direction, whether it be horizontal or vertical changes (note that offsets of less than 600mm along a run are not considered a change of direction)

• In both directions at the top of all risers where risers exceed 900mm.

• Rigid Strut Bracing

• Post (Cantibrace) Bracing

• Customized Rigid bracing

• Wire Rope Bracing

• Tension Rod Bracing

• Integrating seismic in the original component gravity support

• Integrating seismic bracing into modular prefab

• Snubbers and restraining floor mounted equipment

• Anchors - Some fixing types are vulnerable to the dynamic nature of seismic forces such that they might shift, slip or jump out of place. We only use only anchors rated for seismic loads by their manufacture

• Sprinklers/Piping

• Flexible Connectors and Droppers

• Branch Lines

• Risers

• Cables

• Flexible Connections and Expansion Joints

• Valves and Valve Actuators

• Deluge System Components

• Pumps and Tanks

• Piping

• Flexible Connectors and Droppers

• Branch Lines

• Risers

• Flexible Connections and Expansion Joints

• Pumps and Tanks

• Storage

• Piping

• Risers

• Flexible Connections

• Expansion Joints

• Pumps

• Tanks

Eurofast in-house engineering team specialise in seismic bracing and restraint systems designed for non-structural components with general designs available to include with

your documents and general notes/details

MechanicalDuctwork, Pipework, Fans, Chillers, Boilers, AHUs and FCUs and most

important Cooling towers!

ElectricalCable Trays, Switchboards, Battery

Racks, Lighting, Generators and Fuel Tanks

FireDeluge Systems, Sprinklers,

Pumps and Tanks

Hydraulic PlumbingPipework, Pumps, Tanks

Medical GasMedical Gas Supply Pipework,

Tanks and Storage