English

DEVELOPMENT OF NEW PERFORMANCE BASED STANDARDS FOR EARTH BUILDING

As the number of houses built from earth increases in New Zealand so has the need for standards. The background, development and some key technical issues are outlined. Three New Zealand Standards for earth building have been developed using limit state design principles. The standards are NZS 4297 Engineering Design of Earth Buildings, NZS 4298 Materials and Workmanship for Earth Buildings and NZS 4297 Earth Buildings Not Requiring Specific Design. The standards cover adobe (sun dried brick), rammed earth and pressed brick construction including reinforced and unreinforced walls. No substantial performance based standards have been developed internationally so much of the approach had to be developed for these standards. The design approach is based on existing masonry and concrete standards. An energy method is used for out-of-plane seismic design of unreinforced earth walls. Simple and low cost materials tests were adopted to establish that earth wall materials meet the building code requirements. Construction details are based on current best practice in both Australia and New Zealand. A small number of structural tests were carried out to confirm the structural strengths assum

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