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Research papers, The University of Auckland Library

The Catholic Cathedral is classified as a category 1 listed heritage building constructed largely of unreinforced stone masonry, and was significantly damaged in the recent Canterbury earthquakes of 2010 and 2011. In the 2010 event the building presented slight to moderta damage, meanwhile in the 2011 one experienced ground shaking in excess of its capacity leading to block failures and partial collapse of parts of the building, which left the building standing but still posing a significant hazard. In this paper we discuss the approach to develop the earthquake analysis of the building by 3D numerical simulations, and the results are compared/calibrated with the observed damage of the 2010 earthquake. Very accurate records were obtained during both earthquakes due to a record station located least than 80 m of distance from the building and used in the simulations. Moreover it is included in the model the soil structure interaction because it was observed that the ground and foundation played an important role on the seismic behavior of the structure. A very good agreement was found between the real observed damage and the nonlinear dynamic simulations described trough inelastic deformation (cracking) and building´s performance.

Images, eqnz.chch.2010

20100913_3424_1D3-400 Castle Rock The damage to Castle Rock, overlooking the Heathcote Valley from the 7.1 earthquake on September 4th. #385

Research papers, Lincoln University

The study contributes to a better understanding of utilisation and interaction patterns in post-disaster temporary urban open spaces. A series of devastating earthquakes caused large scale damage to Christchurch’s central city and many suburbs in 2010 and 2011. Various temporary uses have emerged on vacant post-earthquake sites including community gardens, urban agriculture, art installations, event venues, eateries and cafés, and pocket parks. Drawing on empirical data obtained from a spatial qualities survey and a Public Life Study, the report analyses how people used and interacted with three exemplary transitional community-initiated open spaces (CIOS) in relation to particular physical spatial qualities in central Christchurch over a period of three weeks. The report provides evidence that users of post-disaster transitional community-initiated open spaces show similar utilisation and interaction patterns in relation to specific spatial qualities as observed in other urban environments. The temporary status of CIOS did apparently not influence ‘typical’ utilisation and interaction patterns.

Images, eqnz.chch.2010

20130125_1749_1D3-400 Road Closed 1 The Lyttelton side of Evans Pass is closed (since the earthquake 23 months ago - 22/02/11). Prior to the road tunnel (through the Port Hills) opening in the early 1960s this was the main access road to the port of Lyttelton. #3072

Images, eqnz.chch.2010

20120529_5558_1D3-400 Waters Edge Demolition [Explored] Demolition of the relatively new seven-storey Waters Edge Apartments in Ferrymead continues. CERES Environmental NZ are doing the job for CERA (Canterbury Earthquake Recovery Authority). Some will be pleased to see this block go as there was lot of resentment to it being built on the site...

Images, eqnz.chch.2010

20160419_7732_7D2-400 The City is in Rebuild phase (110/366) A totally different view to a few years ago. Most of the tall buildings have gone and construction is underway on a lot of new buildings, View from across the Estuary in Redcliffs. A couple of days ago the government agency controlling the post-earthquake work (CERA - Canterbury Ea...

Images, eqnz.chch.2010

20130817_2457_1D3-400 The story of Christchurch (Day 229/365) Many roads are closed all over eastern Christchurch as infra-structure repairs are carried out, whether it be water supplies, sewer repairs (as is the case here) or general road repairs, In just over two weeks it will be three years since the first earthquake happened (4th September...

Images, eqnz.chch.2010

Cleaning up Manning Signs of the silt from liquefaction. Three fellow workers man the shovels while two building engineers talk to the boss (hidden). After doing the car park we then turned our hands to the inside of the factory, once clearance was given that we could go inside.

Research papers, University of Canterbury Library

Observations of out-of-plane (OOP) instability in the 2010 Chile earthquake and in the 2011 Christchurch earthquake resulted in concerns about the current design provisions of structural walls. This mode of failure was previously observed in the experimental response of some wall specimens subjected to in-plane loading. Therefore, the postulations proposed for prediction of the limit states corresponding to OOP instability of rectangular walls are generally based on stability analysis under in-plane loading only. These approaches address stability of a cracked wall section when subjected to compression, thereby considering the level of residual strain developed in the reinforcement as the parameter that prevents timely crack closure of the wall section and induces stability failure. The New Zealand code requirements addressing the OOP instability of structural walls are based on the assumptions used in the literature and the analytical methods proposed for mathematical determination of the critical strain values. In this study, a parametric study is conducted using a numerical model capable of simulating OOP instability of rectangular walls to evaluate sensitivity of the OOP response of rectangular walls to variation of different parameters identified to be governing this failure mechanism. The effects of wall slenderness (unsupported height-to-thickness) ratio, longitudinal reinforcement ratio of the boundary regions and length on the OOP response of walls are evaluated. A clear trend was observed regarding the influence of these parameters on the initiation of OOP displacement, based on which simple equations are proposed for prediction of OOP instability in rectangular walls.

Research papers, Lincoln University

Creative temporary or transitional use of vacant urban open spaces is seldom foreseen in traditional urban planning and has historically been linked to economic or political disturbances. Christchurch, like most cities, has had a relatively small stock of vacant spaces throughout much of its history. This changed dramatically after an earthquake and several damaging aftershocks hit the city in 2010 and 2011; temporary uses emerged on post-earthquake sites that ran parallel to the “official” rebuild discourse and programmes of action. The paper examines a post-earthquake transitional community-initiated open space (CIOS) in central Christchurch. CIOS have been established by local community groups as bottom-up initiatives relying on financial sponsorship, agreements with local landowners who leave their land for temporary projects until they are ready to redevelop, and volunteers who build and maintain the spaces. The paper discusses bottom-up governance approaches in depth in a single temporary post-earthquake community garden project using the concepts of community resilience and social capital. The study analyses and highlights the evolution and actions of the facilitating community organisation (Greening the Rubble) and the impact of this on the project. It discusses key actors’ motivations and values, perceived benefits and challenges, and their current involvement with the garden. The paper concludes with observations and recommendations about the initiation of such projects and the challenges for those wishing to study ephemeral social recovery phenomena.