# EVOLUTIONARY ALGORITHMS FOR THE IDENTIFICATION OF STRUCTURAL SYSTEMS IN EARTHQUAKE ENGINEERING

### Anastasia Athanasiou, Matteo De Felice, Giuseppe Oliveto, Pietro S. Oliveto

#### Abstract

An application of Evolution Strategies (ESs) to the structural identification of base isolation systems in earthquake engineering is presented. The analysis of a test problem considered in the literature clearly shows the effectiveness of ESs for the problem. Simple ESs outperform the previously used methods while state-of-the-art ones, such as the CMA-ES, provide practically exact solutions. The application of the CMA-ES to the real data recorded in 2004, when releasing imposed displacements on a building in Solarino, leads to improved identification results and gives hints of limitations in the model available in literature. Improved models of higher dimensionality are introduced to overcome such limitations. The application of the CMA-ES with the new models leads to improvements of up to 53% compared to the previous solutions in literature. Thus, ESs are shown to be a very powerful tool for the dynamic identification of structural systems and an important aid in the design and evaluation of models of high dimensionality for structure identification.

#### References

- Athanasiou, A. and Oliveto, G. (2011). Modelling hybrid base isolation systems for free vibration simulations. In Proc. of 8CUEE, pages 1293-1302, Tokyo, Japan.
- Beyer, H.-G. and Schwefel, H.-P. (2002). Evolution strategies, a comprehensive introduction. Natural Computing, 1:3-52.
- Hansen, N. and Ostermeier, A. (2001). Completely derandomized self-adaptation in evolution strategies. Evolutionary Computation, 9(2):159-195.
- Kern, S., Müller, S. D., Hansen, N., Büche, D., Ocenasek, J., and Koumoutsakos, P. (2003). Learning probability distributions in continuous evolutionary algorithms - a comparative review. Natural Computing, 3:77-112.
- Oliveto, N. D., Scalia, G., and Oliveto, G. (2010). Time domain identification of hybrid base isolation systems using free vibration tests. Earthquake engineering and structural dynamics, 39(9):1015-1038.
- Schwefel, H. P., editor (1993). Evolution and Optimum Seeking: The Sixth Generation. Wiley & Sons, NY, USA.

#### Paper Citation

#### in Harvard Style

Athanasiou A., De Felice M., Oliveto G. and S. Oliveto P. (2011). **EVOLUTIONARY ALGORITHMS FOR THE IDENTIFICATION OF STRUCTURAL SYSTEMS IN EARTHQUAKE ENGINEERING** . In *Proceedings of the International Conference on Evolutionary Computation Theory and Applications - Volume 1: ECTA, (IJCCI 2011)* ISBN 978-989-8425-83-6, pages 52-62. DOI: 10.5220/0003672900520062

#### in Bibtex Style

@conference{ecta11,

author={Anastasia Athanasiou and Matteo De Felice and Giuseppe Oliveto and Pietro S. Oliveto},

title={EVOLUTIONARY ALGORITHMS FOR THE IDENTIFICATION OF STRUCTURAL SYSTEMS IN EARTHQUAKE ENGINEERING},

booktitle={Proceedings of the International Conference on Evolutionary Computation Theory and Applications - Volume 1: ECTA, (IJCCI 2011)},

year={2011},

pages={52-62},

publisher={SciTePress},

organization={INSTICC},

doi={10.5220/0003672900520062},

isbn={978-989-8425-83-6},

}

#### in EndNote Style

TY - CONF

JO - Proceedings of the International Conference on Evolutionary Computation Theory and Applications - Volume 1: ECTA, (IJCCI 2011)

TI - EVOLUTIONARY ALGORITHMS FOR THE IDENTIFICATION OF STRUCTURAL SYSTEMS IN EARTHQUAKE ENGINEERING

SN - 978-989-8425-83-6

AU - Athanasiou A.

AU - De Felice M.

AU - Oliveto G.

AU - S. Oliveto P.

PY - 2011

SP - 52

EP - 62

DO - 10.5220/0003672900520062