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Images, UC QuakeStudies

A photograph of earthquake damage to the Crown Masonic Lodge on Wordsworth Street, also known as the Freemasons Centre. Sections of this brick wall at the front of the building have collapsed.

Images, UC QuakeStudies

Rubble in front of a two-storey house on Peterborough Street, the brick side wall of which has fallen away, exposing the rooms inside. Further rubble from a neighbouring house lies in the foreground.

Research papers, University of Canterbury Library

In most design codes, infill walls are considered as non-structural elements and thus are typically neglected in the design process. The observations made after major earthquakes (Duzce 1999, L’Aquila 2009, Christchurch 2011) have shown that even though infill walls are considered to be non-structural elements, they interact with the structural system during seismic actions. In the case of heavy infill walls (i.e. clay brick infill walls), the whole behaviour of the structure may be affected by this interaction (i.e. local or global structural failures such as soft storey mechanism). In the case of light infill walls (i.e. non-structural drywalls), this may cause significant economical losses. To consider the interaction of the structural system with the ‘non-structural ’infill walls at design stage may not be a practical approach due to the complexity of the infill wall behaviour. Therefore, the purpose of the reported research is to develop innovative technological solutions and design recommendations for low damage non-structural wall systems for seismic actions by making use of alternative approaches. Light (steel/timber framed drywalls) and heavy (unreinforced clay brick) non-structural infill wall systems were studied by following an experimental/numerical research programme. Quasi-static reverse cyclic tests were carried out by utilizing a specially designed full scale reinforced concrete frame, which can be used as a re-usable bare frame. In this frame, two RC beams and two RC columns were connected by two un-bonded post tensioning bars, emulating a jointed ductile frame system (PRESSS technology). Due to the rocking behaviour at the beam-column joint interfaces, this frame was typically a low damage structural solution, with the post-tensioning guaranteeing a linear elastic behaviour. Therefore, this frame could be repeatedly used in all of the tests carried out by changing only the infill walls within this frame. Due to the linear elastic behaviour of this structural bare frame, it was possible to extract the exact behaviour of the infill walls from the global results. In other words, the only parameter that affected the global results was given by the infill walls. For the test specimens, the existing practice of construction (as built) for both light and heavy non-structural walls was implemented. In the light of the observations taken during these tests, modified low damage construction practices were proposed and tested. In total, seven tests were carried out: 1) Bare frame , in order to confirm its linear elastic behaviour. 2) As built steel framed drywall specimen FIF1-STFD (Light) 3) As built timber framed drywall specimen FIF2-TBFD (Light) 4) As built unreinforced clay brick infill wall specimen FIF3-UCBI (Heavy) 5) Low damage steel framed drywall specimen MIF1-STFD (Light) 6) Low damage timber framed drywall specimen MIF2-TBFD (Light) 7) Low damage unreinforced clay brick infill wall specimen MIF5-UCBI (Heavy) The tests of the as built practices showed that both drywalls and unreinforced clay brick infill walls have a low serviceability inter-storey drift limit (0.2-0.3%). Based on the observations, simple modifications and details were proposed for the low damage specimens. The details proved to be working effectively in lowering the damage and increasing the serviceability drift limits. For drywalls, the proposed low damage solutions do not introduce additional cost, material or labour and they are easily applicable in real buildings. For unreinforced clay brick infill walls, a light steel sub-frame system was suggested that divides the infill panel zone into smaller individual panels, which requires additional labour and some cost. However, both systems can be engineered for seismic actions and their behaviour can be controlled by implementing the proposed details. The performance of the developed details were also confirmed by the numerical case study analyses carried out using Ruaumoko 2D on a reinforced concrete building model designed according to the NZ codes/standards. The results have confirmed that the implementation of the proposed low damage solutions is expected to significantly reduce the non-structural infill wall damage throughout a building.

Images, UC QuakeStudies

Damaged shops on the corner of Worcester Street and Stanmore Road. The top level of the shops has collapsed onto the footpath in front where the rubble still lies. Wire fencing has been placed around the building as a cordon.

Images, UC QuakeStudies

A photograph of an earthquake damaged building on the corner of Manchester Street and Struthers Lane. The front wall of the building has crumbled, exposing the inside. One of the rooms is heavily graffitied.

Images, UC QuakeStudies

A photograph of the earthquake damage to Knox Church on the corner of Bealey Avenue and Victoria Street. The brick walls of the gables have collapsed, exposing the building's wooden frame and the inside of the building. Wire fences and emergency tape have been placed around the building as a cordon.

Images, UC QuakeStudies

A photograph of the earthquake damage to a group of shops on the corner of Barbadoes Street and Edgeware Road. The second storey of the shops has collapsed, and the bricks have fallen to the footpath, taking the awnings with them. Police tape and road cones have been placed around the buildings as a cordon.

Images, UC QuakeStudies

A photograph of the earthquake damage to a group of shops on the corner of Barbadoes Street and Edgeware Road. The second storey of the shops has collapsed, and the bricks have fallen to the footpath, taking the awnings with them. Police tape and road cones have been placed around the buildings as a cordon.

Audio, Radio New Zealand

A story of hope, at least when it comes to the rebuilding challenge ahead, particularly of Christchurch's badly damaged Cathedral. The Australian city of Newcastle suffered a major earthquake in 1989, and over the next few years put huge effort into rebuilding, virtually brick by brick, its ruined Cathedral. John McNaughton, who was the Lord mayor of Newcastle who oversaw the rebuild, joins us.

Images, UC QuakeStudies

A photograph of the earthquake damage to the Chinese Methodist Church on Papanui Road. The bricks at the top of the tower have crumbled, and the wooden bracing is hanging half off the building. The spire of the tower can be seen to the left where it was moved to following the 4 September 2010 earthquake.

Images, UC QuakeStudies

A photograph of the earthquake damage to the John Burns & Co. Ltd building on Lichfield Street. The top section of the side wall has collapsed and the bricks have spilled onto the car park below, exposing the inside of the building. Several crushed cars have been removed from the car park and stacked on the street.

Images, UC QuakeStudies

A photograph of the earthquake damage to a house on Major Hornbrook Drive. The chimney has collapsed and many of the tiles have been lifted on the roof. Tarpaulins have been laid over the holes in the roof as waterproofing, but the closest has shredded. Gaps can be seen between the bricks in the wall and the wall to the left has crumbled.

Images, UC QuakeStudies

A photograph of an earthquake-damaged house. Wooden bracing has been placed in between the house and the fence, with wires connecting the top of the bracing to the peak of the roof. Emergency management personnel are in the driveway to the right. In the foreground a section of the brick fence at the front of the property has toppled.

Images, UC QuakeStudies

A photograph of rubble from a number of earthquake-damaged buildings on Bealey Avenue. Bricks from the building in the distance have spilled onto the footpath in front and wire fencing has been used to cordon it off. In the foreground, rubble from a demolished house can be seen. Cordon tape reading "danger keep out" has been draped across the fence.

Images, UC QuakeStudies

A photograph of emergency management personnel standing next to an earthquake-damaged house. The wall on the left side of the house has collapsed and the bricks have spilled into the driveway in front. Wooden bracing has been placed in between the house and the fence, with wires connecting the top of the bracing to the peak of the roof.

Images, UC QuakeStudies

A photograph of the earthquake damage to a house on Woodham Road. The bottom storey of the house has crumbled, bringing the top storey to the ground. A large pile of bricks and two bay windows now lie beneath the top storey. A red sticker on one of the bay windows indicates that the house is unsafe to enter.

Images, UC QuakeStudies

A photograph of the earthquake damage to the Provincial Hotel on the corner of Barbadoes and Cashel Streets. The second storey walls have crumbled, and the bricks have fallen onto the ground below. Scaffolding erected in front of the building is now on a lean. Wire fencing has been placed around the building as a cordon.

Images, UC QuakeStudies

A photograph of the earthquake damage to a house on Major Hornbrook Drive. The chimney has collapsed and many of the tiles have been lifted on the roof. Tarpaulins have been laid over the holes in the roof as waterproofing, but the closest has shredded. Gaps can be seen between the bricks in the wall and the wall to the left has crumbled.

Images, UC QuakeStudies

A photograph of an earthquake-damaged building on Acton Street. The closest section of the outer wall has collapsed, the bricks and other rubble spilling onto the pavement in front. A boat which was being stored inside has toppled over and is now sticking out of the building. Several cars, also stored inside the building, are visible.