Location

San Diego, California

Session Start Date

3-26-2001

Session End Date

3-31-2001

Abstract

Newmark method is a commonly accepted practice in geotechnical earthquake engineering to estimate seismically induced displacement of earth structures. The method currently requires performing a series of analyses using multiple computer programs to 1) identify a potential sliding mass, 2) compute a factor of safety, 3) calculate a yield acceleration, and 4) perform a double integration of that portion of a given horizontal acceleration history that exceeds the yield acceleration. The Newmark method provides satisfactory results for a horizontal sliding surface. However, for an inclined sliding surface the result is unconservative and for a nonplanar one is not clear. To avoid the problems and to facilitate the Newmark method a numerical technique was developed and a computer program was written to carry out the analysis. A single analysis determines a two-dimensional pattern of seismically induced displacement due to given earthquake motions. Results of analyses for three examples are given to demonstrate the comparison between the new method and the Newmark method.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Meeting Name

Fourth Conference

Publisher

University of Missouri--Rolla

Publication Date

3-26-2001

Document Version

Final Version

Rights

© 2001 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Mar 26th, 12:00 AM Mar 31st, 12:00 AM

Is Newmark Method Conservative?

San Diego, California

Newmark method is a commonly accepted practice in geotechnical earthquake engineering to estimate seismically induced displacement of earth structures. The method currently requires performing a series of analyses using multiple computer programs to 1) identify a potential sliding mass, 2) compute a factor of safety, 3) calculate a yield acceleration, and 4) perform a double integration of that portion of a given horizontal acceleration history that exceeds the yield acceleration. The Newmark method provides satisfactory results for a horizontal sliding surface. However, for an inclined sliding surface the result is unconservative and for a nonplanar one is not clear. To avoid the problems and to facilitate the Newmark method a numerical technique was developed and a computer program was written to carry out the analysis. A single analysis determines a two-dimensional pattern of seismically induced displacement due to given earthquake motions. Results of analyses for three examples are given to demonstrate the comparison between the new method and the Newmark method.