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The benefits of resilient building design
Earthquake structural protection
The construction of resilient building designs in New Zealand has gained momentum since the 2011 Canterbury earthquake sequence. In Christchurch alone, there has been in excess 26 new resilient building designs constructed.
Christchurch Cathedral
AURECON ON RESILIENT BUILDING DESIGN
So what are the benefits of a resilient building design?
151 Cambridge Terrace, Christchurch. Base isolated using Earthquake Protection Systems (EPS) triple friction pendulum bearing. First use of EPS triple pendulum bearings in New Zealand.
1
It’s facility can function post disaster
Often referred to as Low Damage Design, resilient building design enables buildings to respond to significant events without causing irreparable damage to the primary structural elements whilst maintaining a focus on life safety and avoiding dangerous building collapse.
Tait Communications, Christchurch. Features a controlled rocking structure using ringfeder hold-down springs.
AURECON ON RESILIENT BUILDING DESIGN
2
It limits structural damage
The fundamental principal behind the structural design of resilient buildings is ensuring seismic energy is dissipated and strain is concentrated into ductile replaceable parts. This is to protect the primary structure from damage.
The Terrace Development, Christchurch. Two way sliding hinge beam column joint.
AURECON ON RESILIENT BUILDING DESIGN
3
It ensures life safety
Life safety is implicit in any building design. However base isolation will enhance occupant safety during a major earthquake and protect the building contents.
Grand Central Redevelopment, Christchurch. Aurecon Technical Director Sean Gledhill oversees the placement of the Triple Pendulum Isolation Bearings.
AURECON ON RESILIENT BUILDING DESIGN
4
It can allow business continuity
A resilient building may allow you early occupation after an earthquake and business continuity. Gaining access can otherwise be a timely process and costly to your business.
Lucas House, Nelson. Features post tensioned rocking precast concrete walls with compression and tension buckling restrained energy dissipaters.
AURECON ON RESILIENT BUILDING DESIGN
5
It can cope with repeated aftershocks
Whilst normal buildings will be fatigued after an earthquake sequence, resilient buildings can continue to absorb multiple earthquakes and be readily reinstated to pre-earthquake conditions.
Te Puni Village, Wellington. Features a world first application of controlled rocking concentric braced frames with ringfeder springs in combination with sliding hinge joints.
AURECON ON RESILIENT BUILDING DESIGN
It can increase staff confidence
6 Staff confidence is boosted with the knowledge that the building has specific features which are beyond the minimum criteria specified in seismic design codes.
NMIT, Nelson. Features post tensioned rocking timber shear walls with U-shaped flexural plates.
AURECON ON RESILIENT BUILDING DESIGN
7
It’s suitable for infrastructure and multi-level buildings
Any structural form is capable of resilient detailing so architectural and building functionality drivers are not compromised. Resilient buildings have the same primary structure as any conventionally designed building, i.e. shear walls, frames or braced frames.
Elevate Apartments, Wellington. Features low damage rocking braced frames in combination with ringfeder hold-down springs.
AURECON ON RESILIENT BUILDING DESIGN
8Damage is localised to replaceable structural elements and therefore reduces the necessity to demolish a building; it’s recognised as a lower seismic risk and therefore can help to lower insurance premiums.
It’s a lower insurance risk
Knox Church, Christchurch. Features post tensioned rocking buttresses.
AURECON ON RESILIENT BUILDING DESIGN
9The reduction in insurance premiums offsets the additional capital costs. Resilient building design adds one to three per cent of the total construction value of a traditional ductile building; and base isolation, which is the premium method, adds five to seven per cent of the total cost.
It’s cost effective
53 Victoria Street, Christchurch. Features double concave friction slider bearings at ground level.
AURECON ON RESILIENT BUILDING DESIGN
Contact:Stephen HoggTechnical Director – BuildingsDDI +64 3 371 2042M +64 27 240 8212E [email protected]
Sean GledhillTechnical Director – BuildingsDDI +64 3 371 1998 M +64 21 244 1800E [email protected]
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