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Images for crack; more images...

Images, UC QuakeStudies

A photograph of Helen Campbell sitting on Crack'd for Christchurch's armchair artwork. The artwork had just been unveiled during the launch of the Green Room garden on Colombo Street.Crack'd for Christchurch comments, "Helen enjoying a well-deserved rest."

Images, UC QuakeStudies

A photograph of the members of Crack'd for Christchurch gathered on and around their armchair and ottoman artworks. The artworks have just been unveiled during the launch of the Green Room garden on Colombo Street.Crack'd for Christchurch comments, "Everyone enjoying the chair."

Images, UC QuakeStudies

A photograph of the crowd at the launch of the Green Room on Colombo Street.Crack'd for Christchurch comments, "Before the speeches. The Green Room is on Colombo Street in the centre of the rebuild, with vacant lots surrounding it. We wanted it to be an oasis of calm and hope for Christchurch people. It is only a temporary site."

Images, UC QuakeStudies

A photograph of a TVNZ camera operator filming the members of Crack'd for Christchurch during the launch of the Green Room garden. The members have gathered around their armchair and ottoman artwork. The armchair and ottoman are covered in white sheets and tied with a blue bow. They will be unveiled for the first time during the launch.Crack'd for Christchurch comments, "The whole team together."

Images, UC QuakeStudies

A photograph of Sarah Campagnolo, Project Co-ordinator for Greening the Rubble, speaking at the opening of the Green Room garden. In the background, members of Crack'd for Christchurch have gathered around their armchair and ottoman artworks. The artworks are wrapped in white sheets and tied with a bow. They will be unveiled for the first time during the launch. To the right, a camera operator from One News is filming the speech.

Images, UC QuakeStudies

A photograph of the crowd at the launch of the Green Room on Colombo Street.Crack'd for Christchurch comments, "Before the speeches. The Green Room is on Colombo Street in the centre of the rebuild, with vacant lots surrounding it. We wanted it to be an oasis of calm and hope for Christchurch people. It is only a temporary site."

Images, UC QuakeStudies

A photograph of the members of Crack'd for Christchurch during the launch of the Green Room garden. The members have gathered next to their armchair and ottoman artwork in the garden. The armchair and ottoman are covered in white sheets and tied with a blue bow. They will be unveiled for the first time during the launch.

Images, UC QuakeStudies

A photograph of members of the public examining Crack'd for Christchurch's armchair mosaic. The armchair and ottoman artworks have just been unveiled during the launch of the Green Room garden on Colombo Street. In the foreground are several members of Crack'd for Christchurch. A camera operator from One News is also filming the event.

Research papers, The University of Auckland Library

New Zealand’s stock of unreinforced masonry (URM) bearing wall buildings was principally constructed between 1880 and 1935, using fired clay bricks and lime or cement mortar. These buildings are particularly vulnerable to horizontal loadings such as those induced by seismic accelerations, due to a lack of tensile force-resisting elements in their construction. The poor seismic performance of URM buildings was recently demonstrated in the 2011 Christchurch earthquake, where a large number of URM buildings suffered irreparable damage and resulted in a significant number of fatalities and casualties. One of the predominant failure modes that occurs in URM buildings is diagonal shear cracking of masonry piers. This diagonal cracking is caused by earthquake loading orientated parallel to the wall surface and typically generates an “X” shaped crack pattern due to the reversed cyclic nature of earthquake accelerations. Engineered Cementitious Composite (ECC) is a class of fiber reinforced cement composite that exhibits a strain-hardening characteristic when loaded in tension. The tensile characteristics of ECC make it an ideal material for seismic strengthening of clay brick unreinforced masonry walls. Testing was conducted on 25 clay brick URM wallettes to investigate the increase in shear strength for a range of ECC thicknesses applied to the masonry wallettes as externally bonded shotcrete reinforcement. The results indicated that there is a diminishing return between thickness of the applied ECC overlay and the shear strength increase obtained. It was also shown that, the effectiveness of the externally bonded reinforcement remained constant for one and two leaf wallettes, but decreased rapidly for wall thicknesses greater than two leafs. The average pseudo-ductility of the strengthened wallettes was equal to 220% of that of the as-built wallettes, demonstrating that ECC shotcrete is effective at enhancing both the in-plane strength and the pseudo-ductility of URM wallettes. AM - Accepted Manuscript