Influence of Nonlinear Models on Dynamic Displacementsby John C. Kariotis, Kariotis & Associates, United States,
Ahmad M. El-Mustapha, Kariotis & Associates, United States,
Abstract: This research is a part of an ongoing multi-year program that is sponsored by the National Science Foundation and conducted under the TCCMAR (Technical Coordinating Committee for Masonry Research) program. The goal of the TCCMAR program is to develop recommendations for the seismic design of reinforced masonry structures. The program links analytical and experimental research to guide the planning of experiments, provide validation of the analytical modeling, and test the seismic design recommendations. Experimental testing of reinforced masonry confirms that nonlinear dynamic models must include behavioral characteristics such as initial stiffness, peak strength, deformation at peak strength, strength degradation, stiffness degradation for reloading and a pinch force value of the hysteretic envelope. A hysteresis model that incorporates these characteristics (EKEH model) has been developed by this research.
Subject Headings: Dynamic models | Mathematical models | Masonry | Seismic design | Model tests | Structural models | Seismic tests | Nonlinear response
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