Christchurch Press Image: John Kirk-Anderson 2010:10:07 13:49:34

Images, UC QuakeStudies

Photograph captioned by Fairfax, "Earthquake damage at Gladstone Pier, Lyttelton".

Christchurch Press Image: John Kirk-Anderson 2010:10:07 13:56:22

Images, UC QuakeStudies

Photograph captioned by Fairfax, "Earthquake damage at Gladstone Pier, Lyttelton".

Christchurch Press Image: John Kirk-Anderson 2010:10:07 13:49:57

Images, UC QuakeStudies

Photograph captioned by Fairfax, "Earthquake damage at Gladstone Pier, Lyttelton".

Christchurch Press Image: John Kirk-Anderson 2010:10:07 13:50:45

Images, UC QuakeStudies

Photograph captioned by Fairfax, "Lyttelton Port CEO, Peter Davie, right explains the earthquake damage to transport minister, Steven Joyce, at Gladstone Pier".

Christchurch Press Image: John Kirk-Anderson 2010:10:07 13:52:19

Images, UC QuakeStudies

Photograph captioned by Fairfax, "Lyttelton Port CEO, Peter Davie, right, explains the earthquake damage to transport minister, Steven Joyce, and MP Amy Adams, centre, at Gladstone Pier. Left is company chief financial officer, Kathy Meads".

BeckerFraserPhotos October 2010 photograph 072

Images, UC QuakeStudies

Structural damage to St Elmo Courts with diagonal cracks between the windows of the building. These cracks show that there has been rocking of the masonry piers which means there is no vertical reinforcement provided in the walls.

Probabilistic seismic performance and loss assessment of a bridge–foundati…

Research papers, University of Canterbury Library

This paper presents the probabilistic seismic performance and loss assessment of an actual bridge– foundation–soil system, the Fitzgerald Avenue twin bridges in Christchurch, New Zealand. A two-dimensional finite element model of the longitudinal direction of the system is modelled using advanced soil and structural constitutive models. Ground motions at multiple levels of intensity are selected based on the seismic hazard deaggregation at the site. Based on rigorous examination of several deterministic analyses, engineering demand parameters (EDP’s), which capture the global and local demand, and consequent damage to the bridge and foundation are determined. A probabilistic seismic loss assessment of the structure considering both direct repair and loss of functionality consequences was performed to holistically assess the seismi risk of the system. It was found that the non-horizontal stratification of the soils, liquefaction, and soil–structure interaction had pronounced effects on the seismic demand distribution of the bridge components, of which the north abutment piles and central pier were critical in the systems seismic performance. The consequences due to loss of functionality of the bridge during repair were significantly larger than the direct repair costs, with over a 2% in 50 year probability of the total loss exceeding twice the book-value of the structure.