Earthquakes and Structures

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Seismic characteristics of a Π-shaped 4-story RC structure with open ground floor

  • Karabini, Martha A. (Civil Engineering Department, Democritus University of Thrace) ;
  • Karabinis, Athanasios J. (Civil Engineering Department, Democritus University of Thrace) ;
  • Karayannis, Chris G. (Civil Engineering Department, Democritus University of Thrace)
  • Received : 2021.10.08
  • Accepted : 2022.02.12
  • Published : 2022.04.25
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Abstract

The configuration of an open ground floor (pilotis) is a common and very critical irregularity observed in multistory reinforced concrete frame structures. The characteristics and the geometrical formation of the beams of the first story proved to be a critical parameter for the overall seismic behavior of this type of Reinforced Concrete (RC) structures. In this work the combination of open ground floor (pilotis) morphology with very strong perimetrical beams at the level of the first story is studied. The observation of the seismic damages and the in situ measurements of the fundamental period of four buildings with this morphology and Π-shaped plan view are presented herein. Further analytical results of a pilotis type Π-shaped RC structure are also included in the study. From the measurements and the analytical results yield that the open ground floor configuration greatly influences the fundamental period whereas this morphology in combination with strong beams can lead to severe local shear damages in the columns of the ground floor. The structural damage was limited in the columns of the ground floor and yet based on the changes of the in situ measured fundamental period the damaged level is assessed as DI=88%. Furthermore, due to the Π-shape of the plan view the tendency of the parts of the building to move independently strongly influences the distribution of the damages over the ground floor vertical elements.

Keywords

References

  1. Arnold, C. and Reitherman, R. (1982), Building Configuration and Seismic Design, Wiley Publ., California, USA.
  2. Das, S. and Nau, J.M. (2003), "Seismic design aspect of vertically irregular reinforced concrete buildings", Earthq. Spectra, 19, 455-477. https://doi.org/10.1193%2F1.1595650. https://doi.org/10.1193%2F1.1595650
  3. De Stefano, M. and Pintucchi, B. (2008), "A review of research on seismic behavior of irregular building structures since 2002", Bull. Earthq. Eng.6(2), 285-305. https://doi.org/10.1007/s10518-007-9052-3.
  4. Di Pasquale, E. and Cakmak A.S. (1987), Detection and Assessment of Seismic Structural Damage, Technical Report, State University of NY at Buffalo, NCEER-87-0015.
  5. Favvata, M., Naoum, M. and Karayannis C. (2013), "Limit states of RC structures with first floor irregularities", Struct. Eng. Mech., 47(6), 791-818. http://:10.12989/sem.2013.47.6.791
  6. Kalogeropoulos, G.I. and Tsonos, A.G. (2014), "Effectiveness of R/C jacketing of substandard R/C columns with short lap splices", Struct. Monit. Maint., 1(3), 273-292. http://10.12989/smm.2014.1.3.273
  7. Karayannis, C.G., Favvata, M.J. and Kakaletsis, D.J. (2011), "Seismic behaviour of infilled and pilotis RC frame structures with beam-column joint degradation effect", Eng. Struct., 33(10), 2821-2831. http://:10.1016/j.engstruct.2011.06.006.
  8. Kirac, N., Dogan, M. and Ozbasaran, H. (2011), "Failure of weak-storey during earthquakes", J. Eng. Fail. Analysis, 18, 572-581. https://doi.org/10.1016/j.engfailanal.2010.09.021.
  9. Lee, H.S., Jung, D.W., Lee, K.B., Kim, H.C. and Lee, K. (2011), "Shake-table responses of a low-rise RC building model having irregularities at first story", Struct. Eng. Mech., 40(4), 517-539. https://doi.org/10.12989/sem.2011.40.4.517.
  10. Loghmani A., Mortezaei A. and Hemmati A. (2020), "A new equation based on PGA to provide sufficient separation distance between two irregular buildings in plan", Earthq. Struct., 18(5), 543-553. http://dx.doi.org/10.12989/eas.2020.18.5.543.
  11. Makhloof, D.A., Ibrahim, A.R. and Ren, X. (2021), "Damage Assessment of Reinforced Concrete Structures through Damage Indices: A State-of-the-Art Review", Comput. Modeling Eng. Sci., http://:10.32604/cmes.2021.016882
  12. Murty, C.V.R., Goel, R.K., Goyal A., Jain, S.K., Sinha, R., Rai, D.C., Arlekar, J.N. and Metzger, R. (2002), "Reinforced concrete structures", Earthq. Spectra, 18(S1), 149-185. https://doi.org/10.1193/1.2803911
  13. Repapis, C., Zeris, C. and Vintzileou, E. (2006), "Evaluation of the seismic performance of existing RC buildings II: A case study for regular and irregular buildings", Earthq. Eng., 10(30), 429-452. http://:DOI10.1080/13632460609350604.
  14. Shatnawi, A.S., Al-Beddawe, E.H. and Musmar, M.A. (2019), "Estimation of fundamental natural period of vibration for reinforced concrete shear walls systems", Earthq. Struct., 16(3), 295-310. http://dx.doi.org/10.12989/eas.2019.16.3.295.
  15. Tsonos, A.G, Kalogeropoulos G.I., Iakovidis, P.E. and Konstantinidis, D. (2007), "Seismic retrofitting of pre-1970 RC bridge columns using innovative jackets", Int. J. Struct. Eng., 8(2), 133-147. http://:10.1504/IJSTRUCTE.2017.084631.
  16. Tsonos, A.G. (2007), "Effectiveness of CFRP-jackets in post-earthquake and pre-earthquake retrofitting of beam-column subassemblages", Struct. Eng. Mech., 27(4), 393-408. http://:10.12989/sem.2007.27.4.393.
  17. Tsonos, A.G. (2008), "Ultra-high-performance fiber reinforced concrete: An innovative solution for strengthening old RC structures and for improving the FRP strengthening method", WIT Transactions Eng. Sci., 64, 273-284. http://:DOI10.2495/MC090261.
  18. Tsonos, A.G., (2019), "Model for the evaluation of the beam-column joint ultimate strength -a more simplified version", Earthq. Struct., 16(2), 141-148. http://:10.12989/eas.2019.16.2.141.