Estimation of Seismic Deformation Demands of Tall Buildings with Symmetric Setbacks
This study estimates the seismic demands of tall
buildings with central symmetric setbacks by using nonlinear time
history analysis. Three setback structures, all 60-story high with
setback in three levels, are used for evaluation. The effects of
irregularities occurred by setback are evaluated by determination of
global-drift, story-displacement and story drift. Story-displacement is
modified by roof displacement and first story displacement and story
drift is modified by global drift. All results are calculated at the
center of mass and in x and y direction. Also the absolute values of
these quantities are determined. The results show that increasing of
vertical irregularities increases the global drift of the structure and
enlarges the deformations in the height of the structure. It is also
observed that the effects of geometry irregularity in the seismic
deformations of setback structures are higher than those of mass
irregularity.
[1] O. A. Pekau, and R. Green, “Inelastic structures with setbacks,” in Proc.
5th World Conference on Earthquake Engineering, Italy, 1974, vol. 2.
[2] J. L. Humar, and E. W. Wright, “Earthquake response of steel-framed
multistorey buildings with setbacks,” Earthquake Engineering and
Structural Dynamics, vol. 5, 1977.
[3] G, R. Aranda, “Ductility demands for R/C frames irregular in elevation,”
in Proc. 8th World Conference on Earthquake Engineering, San
Francisico, 1974, vol. 4.
[4] B. M. Shahrooz, and J. P. Moehle, “Seismic response and design of
setback buildings,” Journal of Structural Engineering, vol. 116, no. 5,
pp. 1423-1439, May. 1990.
[5] A. A. K. Al-Ali, and H. Krawinkler, “Effects of vertical irregularities on
seismic behavior of building structures,” John A. Blume Earthquake
Engineering Center, Stanford University, Stanford, Rep. No. 130, 1998
[6] C. Chintanapakdee and A. K. Chopra, “Seismic response of vertically
irregular frames: response history and modal pushover analysis,”
Journal of Structural Engineering, vol. 130, no. 8, pp. 1177-1185
January. 2004.
[7] S. L. Wood, “Dynamic response of R/C Frames with irregular profiles,”
in Proc. 3rd U.S. National Conference on Earthquake Engineering,
August. 1986.
[8] C. M. Wong, and W. K. Tso, “Seismic loading for buildings with
setbacks,” Canadian Journal of Civil Engineering, vol. 21, no. 5,
October. 1994.
[9] D. Pinto, and A. G. Costa, “Influence of vertical irregularities on seismic
response of buildings,” in Proc. 10th European Conference on
Earthquake Engineering, Rotterdam, 1995, vol. 2.
[10] X. N. Duan , and A. M. Chandler, “Seismic torsional response and
design procedures for a class of setback frame buildings,” Earthquake
Engineering and Structural Dynamics, vol. 24, no. 5, pp. 761–777, 1995
[11] E. G. Valmundsson, and J. M. Nau, “Seismic response of building
frames with vertical structural irregularities”, Journal of Structural
Engineering, vol. 123, no. 1, January. 1997.
[12] M. Fragiadakis, D. Vamvatsikos and M. Papadrakakis, “Evaluation of
the influence of vertical irregularities on the seismic performance of a
nine-storey steel frame,” Earthquake Engineering and Structural
Dynamics, vol. 35, no. 12, pp. 1489–1509, 2006
[13] T. L. Karavasilis, N. Bazeos, D. E. Beskos, “Estimation of seismic
inelastic deformation demands in plane steel MRF with vertical mass
irregularities,” Engineering Structure, vol. 30, no. 11, pp. 3265–3275,
2008
[14] American Society of Civil Engineers, ASCE/SEI 7-10 “Minimum design
loads for buildings and other structures”. Reston, VA. 2010.
[15] G. D. P. K. Seneviratna, and H. Krawinkler, “Evaluation of inelastic
MDOF effects for seismic design,” John A. Blume Earthquake
Engineering Center, Stanford University, Stanford, Rep. No. 120, 1997
[16] A. Alirezaei, S. Vahdani, “Seismic response of tall building with
setback,” unpublished.
[17] American Society of Civil Engineers, ASCE/SEI 41-06 “Seismic
Rehabilitation of Existing Buildings”. Reston, VA. 2007.
[18] Federal Emergency Management Agency, FEMA P695 “Quantification
of Building Seismic Performance Factors”. Washington, D.C. 2008.
[1] O. A. Pekau, and R. Green, “Inelastic structures with setbacks,” in Proc.
5th World Conference on Earthquake Engineering, Italy, 1974, vol. 2.
[2] J. L. Humar, and E. W. Wright, “Earthquake response of steel-framed
multistorey buildings with setbacks,” Earthquake Engineering and
Structural Dynamics, vol. 5, 1977.
[3] G, R. Aranda, “Ductility demands for R/C frames irregular in elevation,”
in Proc. 8th World Conference on Earthquake Engineering, San
Francisico, 1974, vol. 4.
[4] B. M. Shahrooz, and J. P. Moehle, “Seismic response and design of
setback buildings,” Journal of Structural Engineering, vol. 116, no. 5,
pp. 1423-1439, May. 1990.
[5] A. A. K. Al-Ali, and H. Krawinkler, “Effects of vertical irregularities on
seismic behavior of building structures,” John A. Blume Earthquake
Engineering Center, Stanford University, Stanford, Rep. No. 130, 1998
[6] C. Chintanapakdee and A. K. Chopra, “Seismic response of vertically
irregular frames: response history and modal pushover analysis,”
Journal of Structural Engineering, vol. 130, no. 8, pp. 1177-1185
January. 2004.
[7] S. L. Wood, “Dynamic response of R/C Frames with irregular profiles,”
in Proc. 3rd U.S. National Conference on Earthquake Engineering,
August. 1986.
[8] C. M. Wong, and W. K. Tso, “Seismic loading for buildings with
setbacks,” Canadian Journal of Civil Engineering, vol. 21, no. 5,
October. 1994.
[9] D. Pinto, and A. G. Costa, “Influence of vertical irregularities on seismic
response of buildings,” in Proc. 10th European Conference on
Earthquake Engineering, Rotterdam, 1995, vol. 2.
[10] X. N. Duan , and A. M. Chandler, “Seismic torsional response and
design procedures for a class of setback frame buildings,” Earthquake
Engineering and Structural Dynamics, vol. 24, no. 5, pp. 761–777, 1995
[11] E. G. Valmundsson, and J. M. Nau, “Seismic response of building
frames with vertical structural irregularities”, Journal of Structural
Engineering, vol. 123, no. 1, January. 1997.
[12] M. Fragiadakis, D. Vamvatsikos and M. Papadrakakis, “Evaluation of
the influence of vertical irregularities on the seismic performance of a
nine-storey steel frame,” Earthquake Engineering and Structural
Dynamics, vol. 35, no. 12, pp. 1489–1509, 2006
[13] T. L. Karavasilis, N. Bazeos, D. E. Beskos, “Estimation of seismic
inelastic deformation demands in plane steel MRF with vertical mass
irregularities,” Engineering Structure, vol. 30, no. 11, pp. 3265–3275,
2008
[14] American Society of Civil Engineers, ASCE/SEI 7-10 “Minimum design
loads for buildings and other structures”. Reston, VA. 2010.
[15] G. D. P. K. Seneviratna, and H. Krawinkler, “Evaluation of inelastic
MDOF effects for seismic design,” John A. Blume Earthquake
Engineering Center, Stanford University, Stanford, Rep. No. 120, 1997
[16] A. Alirezaei, S. Vahdani, “Seismic response of tall building with
setback,” unpublished.
[17] American Society of Civil Engineers, ASCE/SEI 41-06 “Seismic
Rehabilitation of Existing Buildings”. Reston, VA. 2007.
[18] Federal Emergency Management Agency, FEMA P695 “Quantification
of Building Seismic Performance Factors”. Washington, D.C. 2008.
@article{"International Journal of Architectural, Civil and Construction Sciences:69416", author = "A. Alirezaei and S. Vahdani", title = "Estimation of Seismic Deformation Demands of Tall Buildings with Symmetric Setbacks", abstract = "This study estimates the seismic demands of tall
buildings with central symmetric setbacks by using nonlinear time
history analysis. Three setback structures, all 60-story high with
setback in three levels, are used for evaluation. The effects of
irregularities occurred by setback are evaluated by determination of
global-drift, story-displacement and story drift. Story-displacement is
modified by roof displacement and first story displacement and story
drift is modified by global drift. All results are calculated at the
center of mass and in x and y direction. Also the absolute values of
these quantities are determined. The results show that increasing of
vertical irregularities increases the global drift of the structure and
enlarges the deformations in the height of the structure. It is also
observed that the effects of geometry irregularity in the seismic
deformations of setback structures are higher than those of mass
irregularity.
", keywords = "Deformation demand, drift, setback, tall building.", volume = "9", number = "4", pages = "393-4", }
