Effect of Fling-Step on Seismic Response of Steel Eccentrically Braced Frame Structures

Document Type : Research

Authors

1 Assistant Professor, Department of Civil Engineering, Ardabil Branch, Islamic Azad University, Ardabil, Iran

2 Department of Civil Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran

3 Department of Civil Engineering, Tabriz Branch, Islamic Azad University, Tabriz. Iran.

Abstract

Fling-step and forward directivity are two important characteristics of near-field earthquakes. Forward directivity occurs when the rupture propagates toward the site and arises in fault‐normal direction for strike‐slip faults. Fling-step is the consequence of permanent ground displacement imposed by near-field earthquakes and arises in strike-slip faults in the strike parallel direction. Fling-step effect produces permanent displacement at the end the culmination of displacement time history. This effect is usually omitted from the main record using the standard processing methods and therefore, cannot be determined for different structures. Many studies were performed to obtain seismic response of different structures subjected to near-field earthquake having forward directivity.  On the other hand, there are few references to investigate the effect of fling-step on seismic behavior of structures. For this purpose, 14 earthquake records with fling-step are selected in a way that important factors including fling-step, PGV, PGA and the energy application type are different. The selected records are applied to eccentrically braced frame structures with 3, 6, 9 and 12 stories. A nonlinear time history analysis is used to capture displacement and story-drift ratio responses. The results show that the fling-step effect has no significant impact on any of the considered structures and its effect can be neglected in the case of eccentrically braced frame structures.

Keywords

References

1. Somerville, P.G., Smith, N. F., Graves, R.W. and Abrahamson, N. A. (1997). "Modification of Empirical Strong Ground Motion Attenuation Relations to Include the Amplitude and Duration Effects of Rupture Directivity", Seismological Research Letters, Vol. 68, No.1, PP.199-222 [DOI:10.1785/gssrl.68.1.199]
2. Boore, D. M. and Bommer, J. J. (2005). "Processing of strong-motion accelerograms: Needs, options and consequences", Soil Dynamics and Earthquake Engineering, Vol. 25, PP. 93-115 [DOI:10.1016/j.soildyn.2004.10.007]
3. PEER ground motion database (2016). Available at http://peer.berkeley.edu/peer_ground_motion_database
4. Burks, L.S. and Baker, J.W. (2016). "A predictive model for fling-step in near-fault ground motions based on recordings and simulations", Soil Dynamics and Earthquake Engineering, Vol. 80, PP.119-126 [DOI:10.1016/j.soildyn.2015.10.010]
5. Kamai, R., Abrahamson, N. and Graves, R. (2014). "Adding fling effects to processed ground- motion time histories", Bulletin of the Seismological Society of America, Vol. 104, No. 4, PP. 1914-1929 [DOI:10.1785/0120130272]
6. Kamai, R. and Abrahamson, N. (2015). "Are near-fault fling effects captured in the new NGA West2 ground motion models", Earthquake Spectra, Vol. 31, No. 3, PP. 1629-1645 [DOI:10.1193/101713EQS270M]
7. Alavi, B. and Krawinkler, H. (2001). "Effects of near-fault ground motions on frame structures," Blume Earthquake Engineering Center Technical Report 138, Stanford, CA
8. Zhang, Y. and Iwan, W.D. (2002). "Active interaction control of tall buildings subjected to near-field ground motions", Journal of Structural Engineering ASCE, Vol. 128, No. 1, PP. 69-79 [DOI:10.1061/(ASCE)0733-9445(2002)128:1(69)]
9. Calugaru, V. and Panagiotou, M. (2012). "Response of tall cantilever wall buildings to strong pulse type seismic excitation", Earthquake Engineering and Structural Dynamics, Vol. 41, No. 9, PP. 1301-1318 [DOI:10.1002/eqe.1185]
10. Yahyai, B., Rezayibana, B. and Mohammadrezapour, E. (2011). "Effect of near-fault earthquakes with forward directivity on telecommunication towers", Earthquake Engineering and Engineering Vibration, Vol. 10, PP. 211-218 [DOI:10.1007/s11803-011-0059-z]
11. Stewart, J. P., Chiou, S. J., Bray, J. D., Graves, R. W., Somerville, P. G. and Abrahamson, N. A. (2001). "Ground Motion Evaluation Procedures for Performance-Based Design", Pacific Earthquake Engineering Research Center Technical Report 2001/09, Berkeley, CA
12. Ventura, C. E., Archila, M., Bebamzadeh, A. and Liam Finn, W. D. (2011). "Large coseismic displacements and tall buildings", Structural Design of Tall and Special Buildings, Vol. 20, PP. 85-99 [DOI:10.1002/tal.739]
13. Kalkan, E. and Kunnath, S. K. (2006). "Effects of Fling Step and Forward Directivity on Seismic Response of Buildings", Earthquake Spectra, Vol. 22, No. 2, PP. 367-390 [DOI:10.1193/1.2192560]
14. Burks, L. S. and Baker, J. W. (2014). "Fling in near-fault ground motions and its effect on structural collapse capacity", Tenth U.S. National Conference on Earthquake Engineering Frontiers of Earthquake Engineering July 21-25, Anchorage, Alaska 10NCEE
15. SeismoStruct (2016) .A computer program for static and dynamic nonlinear analysis of framed structures. SeismoSoft, Ltd, Available from: www.seismosoft.com
16. ASCE7-10 (2010). Minimum design loads for buildings and other structures, American Society of Civil Engineers, Reston
17. AISC. (2010). Seismic provisions for structural steel buildings, American Institute of Steel Constructions, Chicago
18. Yahyai, B. and Rezayibana, B. (2015). "Direct displacement-based design of special concentrically-braced frames in near-fault regions", Bulletin of Earthquake Engineering, Vol. 13, PP.2945-2971 [DOI:10.1007/s10518-015-9749-7]
19. Welleman. (2006). Shear Stiffness of Cross section, Springer, ISBN 987-1-4020-4123-5
20. Mansour, N. (2010). "Development of The Design of Eccentrically Braced Frames with Replaceable Shear Links", Ph.D. thesis, Civil Engineering Department., University of Toronto
21. CESMD. (2012). Center for engineering strong motion data, Available at www.strong motioncenter.org
22. Ambraseys, N. N., Smit, P., Douglas, J., Margaris, B., Sigbjornsson, R., Olafsson, S., Suhadolc, P. and Costa, G. (2004). "Internet site for European strong-motion data", Bollettino di Geofisica Terorica e Applicata, Vol. 45, No. 3, PP.113-29
23. Burks, L. S. (2014). "Ground motion simulations: Validation and application for civil engineering problems", Ph.D. thesis, Stanford, CA, Stanford University
Numerical Methods in Civil Engineering
Volume 2, Issue 3
March 2018
Pages 1-13

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History

  • Receive Date: 06 October 2017
  • Revise Date: 08 December 2017
  • Accept Date: 06 January 2018

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