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De Facto Microzonation Through the Use of Soils Factors in Design Triggers.


pdf icon De Facto Microzonation Through the Use of Soils Factors in Design Triggers. (469 K)
Todd, D. R.; Harris, J. R.

International Conference on Seismic Zonation, 5th. Proceedings. October 17-19, 1995, Nice, France, Quest Editions, France, 510-517 pp, 1995.

Keywords:

building technology; design triggers; earthquakes; microzonation; seismic design; seismic zonation; soil factors; critical parameters

Abstract:

The 1994 edition of the "National Earthquake Hazard Reduction Program (NEHRP) Recommended Provisions for the Development of Seismic Regulations for New Buildings" takes a step toward becoming a microzonation-based design guideline by including soils factors in its design control factors (triggers). The Provisions Update Committee of the Building Seismic Safety Council (which publishes the NEHRP Recommended Provisions) is planning to make a full conversion to this type of microzonation in the 1997 edition by including soils factors as a critical parameter in the assignation of Seismic Performance Category. This paper discusses the effect of the changes adopted in the 1994 edition of the NEHRP Recommended Provisions, and examines the impact of full conversion to soils-factor-based control factors.