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Summary

A number of simulation models for seismic performance evaluation of conventional and high performance systems has been implemented by our research group into the Open System for Earthquake Engineering Simulation (OpenSees) platform available through the Pacific Earthquake Engineering Research Center (PEER). We are currently working on several new models that will be soon available to the engineering community.

Deterioration Models for Collapse Assessment of Structural Systems

  • Modified Ibarra-Medina-Krawinkler (IMK) deterioration model with bilinear hysteretic response : This numerical model is able to consider assymetric cyclic deterioration in strength and stiffness in order to simulate the behaviour of composite steel beams. It is also able to consider the residual strength of steel components when subjected to monotonic/cyclic loading. Detailed documentation regarding the input parameters of this model including a list of relevant publications can be found here.

  • Modified Ibarra-Medina-Krawinkler (IMK) deterioration model with peak-oriented hysteretic response : This numerical model is able to consider assymetric cyclic deterioration in strength and stiffness in order to simulate the behaviour of reinforced concrete beams that primarily fail in a flexural mode. This model has been calibrated with more than 200 RC beams (see Lignos and Krawinkler 2012). Detailed documentation regarding the input parameters of this model including a list of relevant publications can be found here.

  • Modified Ibarra-Medina-Krawinkler (IMK) deterioration model with pinching hysteretic response : This numerical model is able to consider assymetric cyclic deterioration in strength and stiffness in order to simulate the behaviour of reinforced concrete beams that fail primarily fail in a shear mode. This model is also able to simulate the hysteretic behaviour of shear connections, beam-to-column gusset plate connections and wooden components. Detailed documentation regarding the input parameters of this model including a list of relevant publications can be found here.

Numerical Models for Steel Frame Structures Equipped with Supplemental Damping Devices

  • Maxwell Model: This numerical model is able to simulate the hysteretic behaviour of nonlinear viscous dampers that are typically used in frame structures. Detailed documentation regarding the input parameters of this model including a list of relevant publications can be found here.

  • Cast Fuse Model: This numerical model simulates the hysteretic response of a cast yielding fuse (CSF) for concentrically braced frames. The CSF system was developed at University of Toronto by Dr. Michael Gray, Prof. Constantin Christopoulos and Prof. Jeffrey Packer. Detailed documentation regarding the input parameters of this model including a list of relevant publications can be found here.

Selected Publications:

  1. Lignos, D.G., Krawinkler, H. (2012). “Development and Utilization of Structural Component Databases for Performance-Based Earthquake Engineering”, ASCE, Journal of Structural Engineering, doi: 10.1061/(ASCE)ST.1943-541X.0000646.

  2. Gray, M.G., Christopoulos, C., Packer, J.A., Lignos, D.G. (2012). “Development, Validation and Modeling of the New Cast Steel Yielding Brace System,” Proceedings ASCE Structures Congress, March 29th-31st, Chicago, IL, USA, SEI institute.

  3. Lignos, D. G., Chung, Y-L., Nagae, T., Nakashima, M. (2011). “Numerical and Experimental Evaluation of Seismic Capacity of High-Rise Steel Buildings Subjected to Long Duration Earthquakes", Journal of Computers and Structures, Vol. 89 (11-12), 959-967.

  4. Lignos, D.G., Krawinkler, H. (2011). “Deterioration Modeling of Steel Components in Support of Collapse Prediction of Steel Moment Frames under Earthquake Loading", ASCE, Journal of Structural Engineering, Vol. 137 (11), 1291-1302.

  5. Lignos, D.G., Krawinkler, H. (2010). “A Steel Database for Component Deterioration of Tubular Hollow Square Steel Columns under Varying Axial Load for Collapse Assessment of Steel Structures under Earthquakes”, Proceedings 7th International Conference on Urban Earthquake Engineering (7CUEE), Tokyo, March 3rd - 5th, Japan, 2010