The Performance of Unreinforced Masonry Buildings in the 2010-2011 Canterbury Earthquake Swarm
The Commission sought the advice of Associate Professor Jason Ingham from Auckland University and Professor Michael Griffith from Adelaide University on the Performance of Unreinforced Masonry Buildings in the 2010-2011 Canterbury Earthquake Swarm. Unreinforced masonry is defined as a construction of clay brick, concrete blocks or natural stone units bound together using lime or cement mortar, without any reinforcing elements such as steel reinforcing bars.
Their report discusses the architectural characteristics and seismic vulnerability of unreinforced masonry buildings in New Zealand, makes observations about the performance of such buildings in the Canterbury earthquakes and available techniques for seismic upgrading. Section 7 recommends certain structural elements of all unreinforced masonry buildings be improved to meet the standard for new buildings and that other elements be improved to meet at least 67% of the standard required for new buildings. The authors also recommend that there be one national standard instead of policies being set by individual territorial authorities.
Due to the size of the report, it is divided into the following segments:
Table of Contents, Glossary, Executive Summary (.PDF) 412 kb
Section 1 Introduction and Background (.PDF) 1.9 mb
Section 2 The Architectural Characteristics and the Number and Seismic Vulnerability of Unreinforced Masonry Buildings in New Zealand
Section 3 Observed Performance of Unreinforced Masonry Buildings in the 2010-2011 Canterbury Earthquake Swarm
Section 4 Techniques for the Seismic Improvement of Unreinforced Masonry Buildings (.PDF) 1.40 mb
Section 5 Set of Representative Buildings
Section 6 Demolition Statistics and Information on the Cost of Seismic Improvement; Section 7 Recommendations and Closing Remarks; Section 8 References (.PDF) 656 kb
Appendix A Terms of Reference Royal Commission of Inquiry into Building Failure Caused by the Canterbury Earthquakes; Appendix B Estimation of URM building population and distribution; Appendix C List of demolished buildings (.PDF) 609 kb
Commission's summary of the report (.PDF) 232 kb
Submissions have closed.
The Performance of Earthquake Strengthened URM Buildings in the Christchurch CBD in the 22 February 2011 Earthquake: Addendum Report, Professor Jason Ingham and Professor Michael Griffith, October 2011
Review of The Performance of Unreinforced Masonry Buildings in the 2010/2011 Canterbury Earthquake Swarm by Fred Turner, structural engineer, from Sacramento, California
Review of the Report Entitled The Performance of Unreinforced Masonry Buildings in the 2010/2011 Canterbury Earthquake Swarm by Bret Lizundia, Principal, Rutherford & Chekene, San Francisco