ISDP
Impact of the Seismic Design Provisions of the International Buidling Code
S.K. Ghosh, 2001, 47 pp.
$46.00

Published by: Structures and Codes Institutes

Structural engineers who design and detail concrete structures for many areas of the U.S. have never had to deal with design and detailing requirements that apply to moderate and severe seismic zones on the West Coast. But that may change due to major revisions fo seismic provisions that first appeared in the International Building Code, IBC 2000.

If you don't normally consider seismic forces because you're designing structures for specific locations of low seismic risk, you may soon have to.

That's because of revisions in the way seismic design critria are determined.

Traditionally, seismic force levels used in design were strictly a function of structure location. With the latest seismic design provisions, design seismic force levels are now a functon of:

* Structure location;

* Nature of the structure's use and occupancy; and

* Type of soil the structure rests on

What does this mean to you? Suppose you're designing an essential faciity such as a hospital in Charlotte and you don't know the average shear wave velocity, standard penetration resistance, or unconfined shear strength for the top 100 feet of soil at the site. These two factors could place your structure in a seismic design category equivalent to that of Seismic Zones 3 or 4, which indicates high seismic risk. That, in turn, triggers a whole host of seismic detailing requirements in Chapter 21 of ACI 318-99.

How will the new IBC2000 requirements affect design of reinforced concrete structures in your area? Find out by purchasing your copy of Impact of the Seismic Design Provisions on the International Building Code.

Contents:
Executive Summary

Introduction

Design Ground Motion Parameters

IBC 2000, NEHRP 1997, ASCE 7-98

NEHRP 1994, ASCE 7-95

UBC 1997

NEHRP 1991; BOCA/NBC 1993, 1996, 1999; SBC 1994, 1997, 1999

Seismic Designing Category

Importance Factor

Exemptions from Seismic Design Requirements

Seismic Design Category - Seismic Performance Category - Seismic Zone

Comparison of 2000 IBC and 1999 BOCA/NBC

Comparison of 2000 IBC and 1997 UBC

Comparison of 2000 IBC and 1999 SBC

Design Base Shear

Comparison of 2000 IBC and 1999 BOCA/NBC

Design Base Shear for Short Period Buildings

R-Values of the IBC and the BOCA/NBC

Period T8 Separating Long-Period Structures from Short-Period Structures

Design Base Shear for Long-Period Building

Comparison of 2000 IBC and 1997 UBC

Design Base Shear for Short Period Buildings

R-Valuees of the IBC and the UBC

Period T8 Seperating Long-Period Structures from Short-Period Structures

Design Base Shear for Long-Period Buildings

Minimum Design Base Shear

Concluding Remarks

Acknowledgement

References

Appendix A - IBC Seismic Provisions Affected by Seismic Design Categories

Appendix B - Seismic Design Categories for SUG I Structures and Seismic Performance Categories fro SUG I Structures or Seismic Zones in Major U.S. Cities