Advertisement

The Effect of Irregularity of Lateral Stiffness in Estimating the Separation Gap of Adjacent Frames

  • Mostafa Khatami
  • Mohsen GeramiEmail author
  • Ali Kheyroddin
  • Navid Siahpolo
Structural Engineering
  • 24 Downloads

Abstract

Structural pounding can lead to local or total damage to the stories at the collision level or to the overall collapse of the building. On the other hand, lateral stiffness irregularity is common in the form of soft or very soft stories, which is due to the alternation in the type of function of the first story of the building. This paper estimates the demand for the normalized separation gap (NSG) at adjacent buildings highest collision level that were a combination of regular and irregular frames. For this purpose, the steel moment resisting frames (MRF), compounds with a total of 700 adjacent states and their NSG, is calculated by the dynamic time history analysis. In addition, irregularity increment in lateral stiffness for the first story could lead to an increase in the NSG of 84% of the adjacent combinations. In this study, a new relationship is proposed to estimate the demand for the NSG with the consideration of the effects of irregularity of lateral stiffness in the lowest story.

Keywords

Normalized separation gap Collision level Irregularity factor Adjacent buildings Nonlinear viscoelastic element 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Notes

Acknowledgments

Not Applicable

References

  1. ASCE/SEI 7-16 (2016) Minimum design loads for buildings and other structures. Standard ASCE/SEI 7-16, American Society of Civil Engineers, Reston, VA, USAGoogle Scholar
  2. Baker JW (2007) Quantitative classification of near-fault ground motions using wavelet analysis. Bulletin of the Seismological Society of America 97(5):1486–1501, DOI:  https://doi.org/10.1785/0120060255 CrossRefGoogle Scholar
  3. Efraimiadou S, Hatzigeorgiou GD, Beskos DE (2013a) Structural pounding between adjacent buildings subjected to strong ground motions. PartI: The effect of different structures arrangment. Earthquake Engineering & Structural Dynamics 42:1509–1528, DOI:  https://doi.org/10.1002/eqe.2285 CrossRefGoogle Scholar
  4. Efraimiadou S, Hatzigeorgiou GD, Beskos DE (2013b) Structural pounding between adjacent buildings subjected to strong ground motions. PartII: The effect of multiple earthquakes. Earthquake Engineering & Structural Dynamics 42:1529–1545, DOI:  https://doi.org/10.1002/eqe.2284 CrossRefGoogle Scholar
  5. ETABS (2015) Analysis reference manual, version 15.2.2. Computers and Structures Inc., Berkeley, CA, USAGoogle Scholar
  6. Favvata MJ (2017) Minimum required separation gap for adjacent RC frames with potential inter-story seismic pounding. Engineering Structures 152:643–659, DOI:  https://doi.org/10.1016/j.engstruct.2017.09.025 CrossRefGoogle Scholar
  7. Hao H (2015) Analysis of seismic pounding between adjacent buildings. Australian Journal of Structural Engineering 16(3):208–225, DOI:  https://doi.org/10.1080/13287982.2015.1092684 CrossRefGoogle Scholar
  8. INBC-No.6 (2014) Design loads for buildings. Iranian National Building Code No.6, Road, Housing and Urban Development Research Center, IranGoogle Scholar
  9. INBC-No.10 (2014) Design and construction of steel structures. Iranian National Building Code No.10, Road, Housing and Urban Development Research Center, IranGoogle Scholar
  10. Jankowski R (2005) Non-linear viscoelastic modelling of earthquake-induced structural pounding. Earthquake Engineering & Structural Dynamics 34:595–611, DOI:  https://doi.org/10.1002/eqe.434 CrossRefGoogle Scholar
  11. Karayannis C, Favvata MJ (2005) Earthquake-induced interaction between adjacent reinforced concrete structures with non-equal heights. Earthquake Engineering & Structural Dynamics 34(1):1–20, DOI:  https://doi.org/10.1002/eqe.398 CrossRefGoogle Scholar
  12. Khatami M, Gerami M, Kheyroddin A, Siahpolo N (2019) The effect of the mainshock-aftershock on the estimation of the separation gap of regular and irregular adjacent structures with the soft story. Journal of Earthquake and Tsunami, DOI:  https://doi.org/10.1142/S1793431120500086 Google Scholar
  13. Kheyroddin A, Kioumarsi M, Kioumarsi B, Faraei A (2018) Effect of lateral structural systems of adjacent buildings on pounding force. Engineering and Structures 14(3):229–239, DOI:  https://doi.org/10.12989/eas.2018.14.3.229 Google Scholar
  14. López-Almansa F, Kharazian A (2018) New formulation for estimating the damping parameter of the Kelvin-Voigt model for seismic pounding simulation. Engineering Structures 175:284–295, DOI:  https://doi.org/10.1016/j.engstruct.2018.08.024 CrossRefGoogle Scholar
  15. McKenna F, Fenves G (2007) Open System for Earthquake Engineering Simulation. University of California, Berkeley, CA, USAGoogle Scholar
  16. Naderpour H, Khatami SM, Barros RC (2017) Prediction of critical distance between two MDOF systems subjected to seismic excitation in terms of artificial neural networks. Periodica Polytechnica Civil Engineering 9618, DOI:  https://doi.org/10.3311/PPci.9618 Google Scholar
  17. PEER (2018) Pacific earthquake engineering research center. Retrieved March 20, 2018, https://peer.berkeley.edu/peer-strong-ground-motion-databases Google Scholar
  18. SeismoSignal (2016) A computer program for signal processing of strong-motion data, Version 5.1.2. SeismosoftGoogle Scholar
  19. Shehata E, Raheem A (2014) Mitigation measures for earthquake induced pounding effects on seismic performance of adjacent buildings. Bulletin of Earthquake Engineering 12:1705–1724, DOI:  https://doi.org/10.1007/s10518-014-9592-2 CrossRefGoogle Scholar
  20. Shrestha B (2013) Effects of separation distance and nonlinearity on pounding response of adjacent structures. International Journal of Civil and Structural Engineering 3(3):603–612, DOI:  https://doi.org/10.6088/ijcser.201203013055 Google Scholar
  21. Standard No.2800 (2014) Iranian code of practice for seismic resistant design of buildings, 4th edition. Road, Housing and Urban Development Research Center, BHRC Publication, IranGoogle Scholar
  22. Takabatake H, Yasui M, Nakagawa Y, Kishida A (2014) Relaxation method for pounding action between adjacent buildings at expansion joint. Earthquake Engineering & Structural Dynamics 43:1381–1400, DOI:  https://doi.org/10.1002/eqe.2402 CrossRefGoogle Scholar
  23. Vaseghi J, Jalali SG (2013) Park-Ang damage index for adjacent steel frames under pounding. Journal of the Croatian Association of Civil Engineers 12:1065–1077, DOI:  https://doi.org/10.14256/JCE.921.2013 Google Scholar

Copyright information

© Korean Society of Civil Engineers 2019

Authors and Affiliations

  1. 1.Structural EngineeringSemnan UniversitySemnanIran
  2. 2.Faculty of Civil EngineeringSemnan UniversitySemnanIran
  3. 3.Dept. of Civil EngineeringAcademic Center of Education-Culture-Research, Khouzestan BranchAhwazIran

Personalised recommendations