NEHRP Consultants

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Applied Technology Council


Consortium of Universities for Research in Earthquake Engineering

Funded by the
National Institute of
Standards and Technology

Projects : Task Order 18


Assessment of Nonlinear Seismic Analysis of Structures Based on Modal Superposition

NIST has been working on an internal research project to develop a new analytical tool to increase the accuracy and efficiency in nonlinear structural analysis, giving the designer increased confidence in the method.  The new analytical tool is nonlinear seismic analysis of structures based on modal superposition, combining the principles of the force analogy method (FAM) and the state space method (SSM).  The FAM is a nonlinear structural analysis technique that uses changes in displacement rather than stiffness to provide nonlinear stiffness forces, and the SSM is an accurate, explicit dynamic analysis algorithm that is more efficient than implicit algorithms that are more typically used in such analyses.

The primary objective of this task is to engage a Project Review Panel (PRP) to provide technical support of this on-going NIST project by providing subject matter expert assessment on the technical merit and potential outcomes of the project.

Task Order 18 Project Review Panel

• Mark Aschheim, Santa Clara University, Santa Clara, California

• Finley Charney, Virginia Polytechnic Institute, Blacksburg, Virginia

• Graham Powell, Graham H. Powell, Inc. Lafayette, California

• Michael Scott, Oregon State University, Corvallis, Oregon

• Ed Wilson, University of California, Berkeley, California

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last updated 03.11.11