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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.

Manuscripts, Alexander Turnbull Library

A preliminary report with findings from an internet survey conducted in the Christchurch region in the days following the Darfield earthquake. Includes eyewitness accounts of alleged earthquake precursors, such as earthquake lights, atmospheric changes, human responses and erratic animal behaviour. Quantity: 1 Electronic document(s). Provenance: The donor provided the following information: In connection with the M7.1 earthquake at Darfield, September 4th, we collected many accounts of alleged precursors via an internet survey. The resulting report is attached. It is an interesting historical document and you might consider adding it to the National LIbrary collection in some form. About 100 copies have been distributed to those who asked for it. There is no official printed form, it is digital only. The report forms the basis of a scientific paper in preparation but it is already apparent that much of the quoted accounts from survey respondents will have to be left out. The report itself will therefore remain a useful document. We plan to submit the scientific paper to Natural Hazards and Earth Science Systems in due course. The report and paper confirm that some real precursors do exist, but cannot be more specific about causes.