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Images for seismicity; more images...

Images, eqnz.chch.2010

Damaged shops at the Manchester Street / Tuam Street corner; aftermath of the magnitude 7.1 earthquake that struck Christchurch on Saturday 4 September 2010.

Images, eqnz.chch.2010

Police road block on Colombo Street; aftermath of the magnitude 7.1 earthquake in Christchurch on Saturday 4-9-2010. Note the unusually deserted streets on a Tuesday afternoon.

Images, eqnz.chch.2010

The quake-damaged facade of the Baptist Church at the Kilmore Street / Madras Street intersection being propped up while repairs are in progress.

Images, eqnz.chch.2010

The now vacated Christchurch City Council building suffered some damage in the magnitude 7.1 earthquake that struck Christchurch on Saturday 4 September 2010.

Images, eqnz.chch.2010

Holes looking like war damage on this shop along Manchester Street; aftermath of the magnitude 7.1 earthquake that struck Christchurch on Saturday 4 September 2010.

Images, eqnz.chch.2010

The quake-damaged facade of the Baptist Church at the Kilmore Street / Madras Street intersection being propped up while repairs are in progress.

Images, eqnz.chch.2010

The quake-damaged facade of the Baptist Church at the Kilmore Street / Madras Street intersection being propped up while repairs are in progress.

Images, eqnz.chch.2010

The quake-damaged facade of the Baptist Church at the Kilmore Street / Madras Street intersection being propped up while repairs are in progress.

Images, eqnz.chch.2010

Time stands still on the Science Museum clock tower as a poignant reminder of the moment the trembler struck Christchurch in the early hours of Saturday 4 September 2010.

Images, eqnz.chch.2010

The now vacated Christchurch City Council building suffered some damage in the magnitude 7.1 earthquake that struck Christchurch on Saturday 4 September 2010.

Images, eqnz.chch.2010

The quake-damaged facade of the Baptist Church at the Kilmore Street / Madras Street intersection being propped up while repairs are in progress.

Images, eqnz.chch.2010

The quake-damaged facade of the Baptist Church at the Kilmore Street / Madras Street intersection being propped up while repairs are in progress.

Images, eqnz.chch.2010

The Police cordon turned Madras Street eerily silent during the Tuesday evening rush hour in the aftermath of the magnitude 7.1 earthquake that hit Christchurch on 4 September 2010.

Images, eqnz.chch.2010

This beautiful building on Madras Street may be condemned after suffering serious structural damage in the magnitude 7.1 earthquake that hit Christchurch on Saturday 4 September 2010.

Images, eqnz.chch.2010

The Christchurch School of Music on Barbadoes Street lost its brick gables in the magnitude 7.1 earthquake that struck Christchurch on Saturday 4 September 2010.

Images, eqnz.chch.2010

The Police cordon turned Madras Street eerily silent during the Tuesday evening rush hour in the aftermath of the magnitude 7.1 earthquake that hit Christchurch on 4 September 2010.

Images, eqnz.chch.2010

The old Christchurch City Council building on Tuam Street was damaged in the magnitude 7.1 earthquake that struck Christchurch on Saturday 4 September 2010.

Images, eqnz.chch.2010

The brick fence of this hostel along Bealey Ave collapsed in the magnitude 7.1 earthquake that struck Christchurch on Saturday 4 September 2010.

Images, eqnz.chch.2010

The old Christchurch City Council building on Tuam Street was damaged in the magnitude 7.1 earthquake that struck Christchurch on Saturday 4 September 2010.

Images, eqnz.chch.2010

Time stands still on the Science Museum clock tower as a poignant reminder of the moment the trembler struck Christchurch in the early hours of Saturday 4 September 2010.

Images, eqnz.chch.2010

Damaged roof has rendered this pub on Madras Street unsafe in the aftermath of the magnitude 7.1 earthquake that hit Christchurch on Saturday 4 September 2010.

Images, eqnz.chch.2010

Unusual Thursday evening rush hour traffic jam along Bealey Ave, in the aftermath of the magnitude 7.1 earthquake that struck Christchurch on Saturday 4 September 2010.

Images, eqnz.chch.2010

This hostel along Bealey Ave lost its chimney stacks and brick fence during the magnitude 7.1 earthquake that struck Christchurch on Saturday 4 September 2010.

Images, eqnz.chch.2010

This hostel along Bealey Ave lost its chimney stacks and brick fence during the magnitude 7.1 earthquake that struck Christchurch on Saturday 4 September 2010.

Images, eqnz.chch.2010

This hostel along Bealey Ave lost its chimney stacks and brick fence during the magnitude 7.1 earthquake that struck Christchurch on Saturday 4 September 2010.

Research papers, University of Canterbury Library

Major earthquakes, such as the Canterbury and Kaikoura events recorded in New Zealand in 2010 and 2016 respectively, highlighted that floor systems can be heavily damaged. At a reduced or full scale, quasi-static experimental tests on structural sub-assemblies can help to establish the seismic performance of structural systems. However, the experimental performance obtained with such tests is likely to be dependent on the drift protocol adopted. This paper provides an overview of the drift protocols which have been assumed in previous relevant experimental activities, with emphasis on those adopted for testing floor systems. The paper also describes the procedure used to define the loading protocol applied in the testing of a large precast concrete floor diaphragm as part of the Recast floor project at the University of Canterbury. Finally, major limits of current loading protocols, and areas of future research, are identified.

Research papers, University of Canterbury Library

A wide range of reinforced concrete (RC) wall performance was observed following the 2010/2011 Canterbury earthquakes, with most walls performing as expected, but some exhibiting undesirable and unexpected damage and failure characteristics. A comprehensive research programme, funded by the Building Performance Branch of the New Zealand Ministry of Business, Innovation and Employment, and involving both numerical and experimental studies, was developed to investigate the unexpected damage observed in the earthquakes and provide recommendations for the design and assessment procedures for RC walls. In particular, the studies focused on the performance of lightly reinforced walls; precast walls and connections; ductile walls; walls subjected to bi-directional loading; and walls prone to out-of-plane instability. This paper summarises each research programme and provides practical recommendations for the design and assessment of RC walls based on key findings, including recommended changes to NZS 3101 and the NZ Seismic Assessment Guidelines.

Research papers, University of Canterbury Library

Beam-column joints are addressed in the context of current design procedures and performance criteria for reinforced concrete ductile frames subjected to large earthquake motions. Attention is drawn to the significant differences between the pertinent requirements of concrete design codes of New Zealand and the United States for such joints. The difference between codes stimulated researchers and structural engineers of the United States, New Zealand, Japan and China to undertake an international collaborative research project. The major investigators of the project selected issues and set guidelines for co-ordinated testing of joint specimens designed according to the codes of the countries. The tests conducted at the University of Canterbury, New Zealand, are reported. Three full-scale beam-column-slab joint assemblies were designed according to existing code requirements of NZS 3101:1982, representing an interior joint of a one-way frame, an interior joint of a two-way frame, and an exterior joint of a two-way frame. Quasistatic cyclic loading simulating severe earthquake actions was applied. The overall performance of each test assembly was found to be satisfactory in terms of stiffness, strength and ductility. The joint and column remained essentially undamaged while plastic hinges formed in the beams. The weak beam-strong column behaviour sought in the design, desirable in tall ductile frames designed for earthquake resistance, was therefore achieved. Using the laws of statics and test observations, the action and flow of forces from the slabs, beams and column to the joint cores are explored. The effects of bond performance and the seismic shear resistance of the joints, based on some postulated mechanisms, are examined. Implications of the test results on code specifications are discussed and design recomendations are made.

Research papers, University of Canterbury Library

The Canterbury Earthquake Sequence (CES), induced extensive damage in residential buildings and led to over NZ$40 billion in total economic losses. Due to the unique insurance setting in New Zealand, up to 80% of the financial losses were insured. Over the CES, the Earthquake Commission (EQC) received more than 412,000 insurance claims for residential buildings. The 4 September 2010 earthquake is the event for which most of the claims have been lodged with more than 138,000 residential claims for this event only. This research project uses EQC claim database to develop a seismic loss prediction model for residential buildings in Christchurch. It uses machine learning to create a procedure capable of highlighting critical features that affected the most buildings loss. A future study of those features enables the generation of insights that can be used by various stakeholders, for example, to better understand the influence of a structural system on the building loss or to select appropriate risk mitigation measures. Previous to the training of the machine learning model, the claim dataset was supplemented with additional data sourced from private and open access databases giving complementary information related to the building characteristics, seismic demand, liquefaction occurrence and soil conditions. This poster presents results of a machine learning model trained on a merged dataset using residential claims from the 4 September 2010.