Search

found 1681 results

Images, UC QuakeStudies

Damage to the north side of ChristChurch Cathedral. The damaged windows have been boarded up and weeds can be seen growing in the lawn. A walkway from Gloucester Street to the Square was opened up for a few days to allow the public a closer look at the cathedral.

Images, UC QuakeStudies

A house on Canterbury Street in Lyttelton with a damaged outer wall. The bricks have fallen away to expose the insulation. Cracks can be seen running diagonally along the remaining wall. Fencing and tape have been placed around the building to warn people off.

Research papers, The University of Auckland Library

During the 2010/2011 Canterbury earthquakes, several reinforced concrete (RC) walls in multi-storey buildings formed a single crack in the plastic hinge region as opposed to distributed cracking. In several cases the crack width that was required to accommodate the inelastic displacement of the building resulted in fracture of the vertical reinforcing steel. This type of failure is characteristic of RC members with low reinforcement contents, where the area of reinforcing steel is insufficient to develop the tension force required to form secondary cracks in the surrounding concrete. The minimum vertical reinforcement in RC walls was increased in NZS 3101:2006 with the equation for the minimum vertical reinforcement in beams also adopted for walls, despite differences in reinforcement arrangement and loading. A series of moment-curvature analyses were conducted for an example RC wall based on the Gallery Apartments building in Christchurch. The analysis results indicated that even when the NZS 3101:2006 minimum vertical reinforcement limit was satisfied for a known concrete strength, the wall was still susceptible to sudden failure unless a significant axial load was applied. Additionally, current equations for minimum reinforcement based on a sectional analysis approach do not adequately address the issues related to crack control and distribution of inelastic deformations in ductile walls.