1. Earthquake Regulations (Sec. 2312);Uniform Building Code,1991
2. National Building Code of Canada 1990;Associate Committee on the National Building Code,1990
3. Code of practice for general structural design and design loadings for buildings;New Zealand Standard NZS 4203,1992
4. Australian Standard: Minimum design load on structures. Part 4: Earthquake;Standards Australia AS 1170.4,1993
5. Eurocode EC8: Structures in seismic regions; Part 1, General design and building;Commission of the European Communities;Report EUR 12266 EN,1989