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Images for shaking; more images...

Images, eqnz.chch.2010

Quake-damaged shops on Manchester Street; aftermath of the magnitude 7.1 earthquake that struck Christchurch on Saturday 3 September 2010.

Images, eqnz.chch.2010

The huge tremor shook the masonry gable off this apartment block in the magnitude 7.1 earthquake in Christchurch on Saturday 4-9-2010.

Images, eqnz.chch.2010

Facade of the Repertory Theatre ended on the ground following the magnitude 7.1 earthquake in Christchurch on Saturday 4-9-2010.

Images, eqnz.chch.2010

Facade of the Repertory Theatre ended on the ground following the magnitude 7.1 earthquake in Christchurch on Saturday 4-9-2010.

Images, eqnz.chch.2010

Masonry gable of the Christchurch School of Music broke off during the magnitude 7.1 earthquake in Christchurch on Saturday 4-9-2010.

Images, eqnz.chch.2010

This building at the Barbadoes Street / St Asaph Street intersection was so badly gamaged it had to be demolished.

Images, eqnz.chch.2010

Quake-damaged shops on Manchester Street; aftermath of the magnitude 7.1 earthquake that struck Christchurch on Saturday 3 September 2010.

Images, eqnz.chch.2010

Rescue services out in full force at the Christchurch Arts Centre following the magnitude 7 earthquake in Christchurch on Saturday 4-9-2010.

Images, eqnz.chch.2010

This 2 storey building has been condemned after its roof collapsed during the magnitude 7.1 earthquake in Christchurch on Saturday 4-9-2010.

Images, eqnz.chch.2010

Front parapet of this building toppled onto Moorhouse Ave; aftermath of a magnitude 7.1 earthquake that struck Christchurch on 4 September 2010.

Images, eqnz.chch.2010

These diggers finished off what the quake failed to completely destroy; aftermath of the magnitude 7.1 earthquake that struck Christchurch on Saturday 4 September 2010.

Images, eqnz.chch.2010

Quake-damaged shops on Manchester Street; aftermath of the magnitude 7.1 earthquake that struck Christchurch on Saturday 3 September 2010.

Images, eqnz.chch.2010

Quake-damaged shops on Manchester Street; aftermath of the magnitude 7.1 earthquake that struck Christchurch on Saturday 3 September 2010.

Images, eqnz.chch.2010

Car damaged by the collapse of the building parapet following the magnitude 7.1 earthquake in Christchurch on Saturday 4-9-2010.

Images, eqnz.chch.2010

No traffic on Tuam Street which was in the area cordoned off following the magnitude 7.1 earthquake in Christchurch on Saturday 4-9-2010.

Images, eqnz.chch.2010

This 2 storey building has been condemned after its roof collapsed during the magnitude 7.1 earthquake in Christchurch on Saturday 4-9-2010.

Images, eqnz.chch.2010

I could have sworn there was another storey above the corner shop; aftermath of a magnitude 7.1 earthquake that struck Christchurch on 4 September 2010.

Images, eqnz.chch.2010

Cross cracks in the brick wall of St Elmo Courts apartment block at the Hereford Street / Montreal Street intersection.

Images, eqnz.chch.2010

Quake-damaged shops on Manchester Street; aftermath of the magnitude 7.1 earthquake that struck Christchurch on Saturday 3 September 2010.

Images, eqnz.chch.2010

Hostel along Bealey Ave with its chimney missing afetr the magnitude 7.1 earthquake that struck Christchurch on Saturday 4 September 2010.

Images, eqnz.chch.2010

Part of the parapet of this building was shaken loose by the magnitude 7.1 earthquake that hit Christchurch on 4 September 2010.

Images, eqnz.chch.2010

Part of the parapet of this building was shaken loose by the magnitude 7.1 earthquake that hit Christchurch on 4 September 2010.

Images, eqnz.chch.2010

St John the Baptist Church at Latimer Square in the aftermath of the magnitude 7.1 earthquake that struck Christchurch on 4 September 2010.

Images, eqnz.chch.2010

St John the Baptist Church at Latimer Square in the aftermath of the magnitude 7.1 earthquake that struck Christchurch on 4 September 2010.

Images, eqnz.chch.2010

This house along Bealey Ave lost its chimney stack in the magnitude 7.1 earthquake that struck Christchurch on Saturday 4 September 2010.

Images, eqnz.chch.2010

The front and side walls of this Christchurch building had completely collapsed after being struck by the the magnitude 7,1 earthquake on 4 September 2010.

Images, eqnz.chch.2010

This hostel along Bealey Ave lost its chimney stack in the magnitude 7.1 earthquake that struck Christchurch on Saturday 4 September 2010.

Research papers, University of Canterbury Library

It is fast becoming common practice for civil engineering infrastructure and building structures to be designed to achieve a set of performance objectives. To do so, consideration is now being given to systems capable of sustaining minimal damage after an earthquake while still being cost competitive. This has led to the development of high performance seismic resisting systems, followed by advances in design methodologies. The paper presents the experimental response of four pre-cast, post-tensioned rocking walls with high-performing dissipating solutions tested on the shake-table at the University of Canterbury. The wall systems were designed as a retrofit solution for an existing frame building however, can also be used for the design of new, high-performance structures. The use of externally mounted dampers allowed numerous dissipation schemes to be explored including mild-steel dampers (hysteretic dampers), viscous dampers, a combination of both or no dampers. The advantages of both velocity and displacement dependant dissipation was investigated for protection against strong ground motions with differing rupture characteristics i.e. far-field and near-field events. The experimental results are used to verify a proposed design procedure for post-tensioned rocking systems with supplementary hysteretic and viscous dissipation. The predicted response compared well with the measured shake-table response.

Images, eqnz.chch.2010

Colombo Street closed off south of Moorhouse Ave, due to a damaged shop now deemed unstable; aftermath of a magnitude 7.1 earthquake that struck Christchurch on 4 September 2010.

Images, eqnz.chch.2010

This shop on Riccarton Road was badly damaged in the magnitude 7.1 earthquake that struck Christchurch on Saturday 4 September 2010, and had to be demolished.