BeckerFraserPhotos September 2010 photograph 131

Images, UC QuakeStudies

The wooden foot bridge over the Kaiapoi River. Slumping between the abutments can be seen.

20100905_3349_1D3-24 South New Brighton bridge mevement - Christchurch ear…

Images, eqnz.chch.2010

The South Brighton bridge abutment (city side). Bridge looks fine, just both approaches have moved A LOT!

BeckerFraserPhotos September 2010 photograph 104

Images, UC QuakeStudies

Damaged pavement on the Williams Street bridge in Kaiapoi. The concrete abutment has risen during the earthquake, forcing its way through the pavement of the footpath into the open.

BeckerFraserPhotos September 2010 photograph 102

Images, UC QuakeStudies

Damaged pavement on the Williams Street bridge in Kaiapoi. The concrete abutment has risen during the earthquake, forcing its way through the pavement of the footpath into the open.

20100904_3322_1D3-200 Bridge Street bridge, Christchurch earthquake

Images, eqnz.chch.2010

20100904_3322_1D3-200 Bridge Street bridge, Christchurch earthquake South Brighton Bridge. See the gap between the abutment and the bridge itself (just to right of lower person).

BeckerFraserPhotos September 2010 photograph 114

Images, UC QuakeStudies

The Williams Street Bridge in Kaiapoi. This part of the footpath was damaged when the concrete abutment rose during the earthquake, forcing its way through the pavement and into the open. Fencing has been placed around this section of the bridge until work can be done to make it safe to walk on.

BeckerFraserPhotos September 2010 photograph 115

Images, UC QuakeStudies

In front of the Williams Street Bridge in Kaiapoi. This part of the footpath was damaged when the concrete abutment rose during the earthquake, forcing its way through the pavement and into the open. Fencing has been placed around this section of the bridge until work can be done to make it safe to walk on.

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.