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Applicability of Nonlinear Multiple-Degree-of-Freedom Modeling for Design

Collaborators: Prof. Helmut Krawinkler (Stanford University), Christopher Putman (Degenkolb Engineers)
Project Sponsors: National Institute of Standards and Technology

  • The Applied Technology Council (ATC) sponsored by the NEHRP consultants Joint Venture established a new project called ATC-76-6 in order to improve nonlinear multiple-degree-of-freedom (MDOF) modeling for design decisions of regular and irregular structural systems. Recognizing the current state of practice, use both currently available research and the results of problem-focused MDOF studies, The project provides guidance on the selection of nonlinear static procedures (NSPs), summarizes the effect of configuration characteristics on selection of analysis methods, refines the limitations of use for NSPs and suggests indications and limitations for analysis methods to predict engineering demand parameters. Guidance is also provided on the implementation of nonlinear analysis methods including specific MDOF modeling implications such as gravity effects. Focused studies related to accuracy and prediction of collapse capacities of different structural systems based on simplified nonlinear methods is also presented. Rather than developing new, complex NSP methods, the goal is to establish bounds on the appropriate use of the current NSP methods and to provide guidance on use of application of NRHA methods, with special emphasis on simple approaches.

Selected Publications:

  1. Lignos, D.G., Putman, C., Krawinkler, H. (2012). “Seismic Assessment of Steel Moment Frames Using Simplified Nonlinear Models”, Book Chapter in “Computational Methods in Earthquake Engineering, Vol. 2”, Published by Springer, NY.

  2. NIST (2010). “Applicability of nonlinear multiple-degree-of-freedom modeling for design”, U.S. Department of Commerce, National Institute of Standards and Technology (NIST GCR 10-917-9).

  3. Lignos, D.G., Putman, C., Krawinkler, H. (2011). “Seismic Assessment of Steel Moment Frames Using Simplified Nonlinear Models,” Proceedings 3rd International Conference in Computational Methods in Structural Dynamics and Earthquake Engineering, COMPDYN11, May 26th-28th, Corfu, Greece.

  4. Krawinkler, H., Lignos, D.G., Putman, C. (2011). “Prediction of Nonlinear Response – Pushover Analysis versus Simplified Nonlinear Response History Analysis”, Proceedings ASCE Structures Congress, Las Vegas, April 14-16th 2011, USA, SEI institute.

  5. Lignos, D.G., Putman, C., Zareian, F., Krawinkler, H. (2011). “Seismic Evaluation of Steel Moment Frames and Shear Walls Using Nonlinear Static Analysis Procedures”, Proceedings ASCE Structures Congress, Las Vegas, April 14-16th 2011, USA, SEI institute.