Liao, Z. P.

Mohammadioun, Bagher

Rosa, D. M.

Todorouska, M. I.

English

Missouri University of Science and Technology (Missouri S&T): Scholars' Mine

Missouri University of Science and Technology Scholars' Mine International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics 1995 - Third International Conference on Recent Advances in Geotechnical Earthquake Engineering & Soil Dynamics 04 Apr 1995, 1:30 pm - 2:30 pm General Report —Session VIII: Seismology: Predicting Strong Ground Motion for Design Bagher Mohammadioun France D. M. Rosa Switzerland M. I. Todorouska U.S.A. Z. P. Liao China Follow this and additional works at: https://scholarsmine.mst.edu/icrageesd  Part of the Geotechnical Engineering Commons Recommended Citation Mohammadioun, Bagher; Rosa, D. M.; Todorouska, M. I.; and Liao, Z. P., "General Report —Session VIII: Seismology: Predicting Strong Ground Motion for Design" (1995). International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics. 8. https://scholarsmine.mst.edu/icrageesd/03icrageesd/session18/8 This Article - Conference proceedings is brought to you for free and open access by Scholars' Mine. It has been accepted for inclusion in International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics by an authorized administrator of Scholars' Mine. This work is protected by U. S. Copyright Law. Unauthorized use including reproduction for redistribution requires the permission of the copyright holder. For more information, please contact scholarsmine@mst.edu. (\ Proceedings: Third International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics lta!\ Apri12-7, 1995; Volume Ill, St. Louis, Missouri General Report - Session VIII Seismology: Predicting Strong Ground Motion for Design Bagher Mohammadioun France D.M. Rosa Switzerland Papers 8.04, 8.0!1, 8.06, and 8.11 provided a framework for discussion of the most important technical issues. They included the following: 1. Scaline of Ground Motion Paramet.ers. Trifunac (Paper 8.05) showed why peak ground acceleration (PGA), the most commonly used parameter in seismic design, is insufficient by itself for most applications and that other physical factors (such as frequency, peale velocity (PGV), duration, aspects of wave propa&ation, and social factors (such as the design application), should also be incorporated into the design process. 2. Shape of the Desi&n Response Spectrum. Todorovska (Paper 8.06) performed a parameter sensitivity study to determine the effect of physical parameters, such as soil, distance, magnitude, fault characteristics, etc. on the shape of the spectrum and concluded that the shape should be based on more than the local soil conditions, the typical approach in building codes. The simultaneous influence of all contributing parameters should be c::onsidered for realistic shapes and the calculation of a uniform hazard spectrum. 3. Variability of Ground Motion. Lubkowski and Pappin (Paper 8.04) pointed out the strong correlation of variability with attenuation. They suggested that the dispersion decreases with frequency, causing the hazard to increase for low frequencies. 4. Use ofSma}l Ea.rthguakes as Green's Functions to Simulate IM&c Events. Heuze and others (Paper 8.11) combined basic seismoloay (linearity) and geotechnical (non-linearity) engineering techniques to create a new method for predicting strong ground motion. They used data from small and large magnitude earthquakes recorded in 1992 at the Painters Street bridge in Rio Dell, California in their simulations. Participants in the audience contributed their insights and experience on these four issues and expanded the scope of the discussion to include the following concepts: 1. Analysis. Be careful when scaling small earthquakes to simulate large events because their physical parameters may differ . narkedly (Piem: Yves Bard' 2. Data Acguisition. Collect all of the empirical data (such as aftershock measurements) you can (Les Youd). 1319 M.l. Todorouska U.S.A. Z.P. Liao China 3. Conpyatjsm. Variability and lack of data force us to be reasonable, yet c::onservative in design. However, uy not to accumulate the margins of safety at each step of the process (Greg Hempen). 4. Design Procedures· For ordinary buildings, a carefully thought out and well detailed design will usually compensate for lack of empirical data, or under conservatism (Mehmet Celebi). S. Improvements jn the State of Knowledge and State ot Pract:ice. The profession has a much better understanding of the geolo&ic, seismolo&ical, and geotechnical aspects of ground motion and design than ten years a&o (John Fcrrito, Les Youd, and Andy Vele..sos). Much remains to be learned about attenuation and PGV, however. 

General Report —Session VIII: Seismology: Predicting Strong Ground Motion for Design

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General Report —Session VIII: Seismology: Predicting Strong Ground Motion for Design

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