Definition of low seismic excitations through probabilistic and deterministic techniques applied to shear buildings

  1. Enrico Zacchei 1
  1. 1 Universidade Estadual Paulista
    info

    Universidade Estadual Paulista

    São Paulo, Brasil

    ROR https://ror.org/00987cb86

Actas:
Proceedings 3rd International Conference on Recent Advances in Nonlinear Design Resilience and Rehabilitation of Structures
  1. Helena Barros (ed. lit.)
  2. Carla Ferreira (ed. lit.)
  3. José M. Adam (ed. lit.)
  4. Norb Delatte (ed. lit.)

ISBN: 9789892098371,  9789892098388

Ano de publicación: 2019

Páxinas: 157-166

Congreso: 3rd International Conference on Recent Advances in Nonlinear Design Resilience and Rehabilitation of Structures (16-18 October 2019, Coimbra)

Tipo: Achega congreso

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Resumo

Brazil has a low level of seismicity compared to several other regions in the world,however, some significant earthquakes have occurred, e.g. deep earthquakes (125-650 kmdepth) with magnitude up to 7.5. In this paper, three analyses are used to define seismic inputsin terms of accelerations in time-domain, pseudo-accelerations and peak ground accelerations:(i) probabilistic seismic hazard analysis (ii) elastic spectrum analysis and (iii) artificialaccelerogram analysis. To carry out the probabilistic seismic hazard analysis the newseismogenic zones for southeast Brazil established in 2018 have been used. From this newmodel the data have been recalculated to show the gap between collected data and obtained dataand to make them practical. Elastic spectrum analysis is in accordance to the Brazilian code,whereas the artificial accelerogram analysis has been developed by analytical models. Theelastic spectrum has been modified based on the results of the probabilistic seismic hazardanalysis. Then, artificial accelerations coherent to the modified and non-modified elasticresponse spectra have been obtained. In this sense, a proposed model is presented. Theadvantages of generating artificial accelerations can be attributable to the fact that when thenumber of earthquake recordings is limited it is possible to derive time-history artificialaccelerograms, which describe the seismic context. In Brazil there is a scarcity of earthquakerecords, therefore the advantage of generating artificial accelerograms is easily understandable.An application for a typical shear building with a multi-story and multi-degree of freedom hasbeen analysed. Result show that the artificial acceleration obtained from the modified elasticspectrum approximated to the probabilistic spectra provides a response in terms of displacementwith less energy.

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