Strengthening unreinforced masonry walls..

Guidelines (draft): http://www.historic.org.nz/~/media/Corporate/Files/Submissions%20and%20research/DraftGuideEarthquakeStrengthening.ashx

Documents from retrofitsolutions.org:
http://www.retrofitsolutions.org.nz/wp-content/uploads/2011/03/Retrofit-Techniques-for-Seismic-Improvement-of-URM-Buildings.pdf

http://www.retrofitsolutions.org.nz/wp-content/uploads/2011/03/Out-of-plane-Strengthening-of-Unreinforced-Masonry-Walls-using-Near-Surface-Mounted-Fibre-Reinforced-Polymer-Strips.pdf

US FEMA standards - the most relevant guide is FEMA Techniques for the Seismic Rehabilitation of Existing Buildings, 547 (2006 Edition) is a comprehensive guide to earthquake strengthening in relation to the FEMA model building types. Each chapter provides a description of the model building type, the seismic response characteristics, common seismic deficiencies and applicable rehabilitation techniques. As an example, the following detailed techniques are outlined for Building Type URM: Unreinforced Masonry (URM) Bearing Walls:

• Brace or remove URM parapets.
• Add wall to diaphragm ties.
• Add reinforced cores to URM walls.
• Add concrete overlay to masonry wall.
• Add fibre-reinforced polymer overlay to masonry wall.
• Infill opening in a URM wall.
• Add concrete or masonry shear wall (connected to a wood diaphragm).
• Add steel moment frame (connected to a wood diaphragm)
• Add or enhance cross walls.
• Add supplemental vertical support for truss or girder.
• Add veneer ties in a URM wall.

See also: http://www.retrofitsolutions.org.nz/

NB. these NZ Standards are also relevant: AS/NZS 1170 Structural Design Action, NZS 3101 Concrete Structures Standard, NZS 3402 Steel Bars for the Reinforcement of Concrete, NZS 4230 Design of Reinforced Concrete Masonry Structures