Development of New Zealand seismic bridge standards

Abstract

During seismic assessments of bridges where there is a lack of construction documentation, one method of determining likely structural detailing is to use historic design standards. An overview of the New Zealand bridge seismic standards and the agencies that have historically controlled bridge design and construction is presented. Standards are grouped into design era based upon similar design and loading characteristics. Major changes in base shear demand, ductility, foundation design, and linkage systems are discussed for each design era, and loadings and detailing requirements from different eras were compared to current design practices. Bridges constructed using early seismic standards were designed to a significantly lower base shear than is currently used but the majority of these bridges are unlikely to collapse due to their geometry and a preference for monolithic construction. Bridges constructed after the late 1970s are expected to perform well if subjected to ground shaking, but unless bridges were constructed recently their performance when subjected to liquefaction and liquefaction-induced lateral spreading is expected to be poor.

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Published
2013-12-31
How to Cite
Hogan, L. S., Wotherspoon, L. M., & Ingham, J. M. (2013). Development of New Zealand seismic bridge standards. Bulletin of the New Zealand Society for Earthquake Engineering, 46(4), 201-221. https://doi.org/10.5459/bnzsee.46.4.201-221
Section
Articles