Approximate Evaluation of Deflection Amplification Factor
Publication: Journal of Structural Engineering
Volume 128, Issue 2
Abstract
In seismic design provisions, the maximum story drift occurring in major earthquakes is estimated by amplifying the drifts computed from an elastic analysis at the prescribed design seismic force level with a deflection amplification factor. A survey of several seismic design provisions indicates that the deflection amplification factor, in most of the provisions, is independent of significant factors such as ductility ratio, fundamental period, and number of stories. In this paper, a statistical evaluation of deflection amplification factor is presented in order to indicate the parameters that have an effect on this factor. Elastoplastic multidegree of freedom (MDOF) models with various dynamic characteristics are first considered. Consequently, nonlinear and corresponding linear time history analyses for 21 severe earthquake ground motions are performed in order to obtain structural response data, which are then used to derive an empirical formula for the deflection amplification factor. Finally, an approximate approach is developed for evaluating the maximum inelastic deflection of MDOF structures.
Get full access to this article
View all available purchase options and get full access to this article.
References
AISC. (1994). “Specification for the design fabrication and erection of structural steel for buildings.” AISC, New York.
Baez, J. I., and Miranda, E. (2000). “Amplification factors to estimate inelastic displacement demands for the design of structures in the near field.” Proc., 12th WCEE Conf., Auckland, New Zealand.
Elghadamsi, F. E., and Mohraz, B.(1987). “Inelastic earthquake spectra.” Earthquake Eng. Struct. Dyn., 15, 91–104.
Fichinger, M., Fajfar, P., and Vidic, T. (1994). “Factors contributing to the response reduction.” Proc., 5th U.S. National Conf. on Earthquake Engineering, Chicago, 97–106.
Hwang, H., and Jaw, J. W. (1990). “Statistical evaluation of deflection amplification factors for reinforced concrete structures.” Proc., 4th U.S. National Conf. on Earthquake Engineering, Palm Springs, Calif., 937–944.
International Conference of Building Officials. (1997). Uniform Building Code, Whittier, Calif.
Krawinkler, H. (1995). “New trends in seismic design methodology.” Proc., 10th Euro. Conf. Eq. Eng., Vienna, Austria, 821–830.
Lai, M., Li, Y., and Zhang, Ch. (1992). “Analysis method of multi-rigid-body model for earthquake responses of shear-type structure.” Proc., 10th WCEE Conf., Madrid, Spain, 4013–4018.
Miranda, E. (1997). “Strength reduction factors in performance-based design.” EERC-CUREe Symposium in Honor of Viltelmo V. Bertero, Berkeley, Calif.
Miranda, E. (2000). “Inelastic displacement ratios for displacement-based earthquake resistant design.” Proc., 12th WCEE Conf., Auckland, New Zealand.
Miranda, E., and Bertero, V. V.(1994). “Evaluation of strength reduction factors for earthquake-resistant design.” Earthquake Spectra, 10(2), 357–379.
Miranda, E., and Bertero, V. V.(1996). “Seismic performance of an instrumented ten-story reinforced concrete building.” Earthquake Eng. Struct. Dyn., 25, 1041–1059.
Nassar, A. A., Osteraas, J. D., and Krawinkler, H. (1992). “Seismic design based on strength and ductility demands.” Proc., 10th WCEE Conf., Madrid, Spain, 5861–5866.
NEHRP Recommended provisions for seismic regulations for new buildings. (1994). Building Seismic Safety Council, Washington, D.C.
Ordaz, M., and Pérez-rocha, L. E.(1998). “Estimation of strength-reduction factors for elastoplastic systems: new approach.” Earthquake Eng. Struct. Dyn., 27, 889–901.
Prakash, V., Powell, G. H., and Filippou, F. C. (1992). “DRAIN-2DX: Base program user guide.” Earthquake Engineering Research Center Rep. No. UCB/SEMM-92/29, College of Engineering, Univ. of California at Berkeley, Berkeley, Calif.
Riddell, R.(1995). “Inelastic design spectra accounting for soil conditions.” Earthquake Eng. Struct. Dyn., 24, 1491–1510.
Riddell, R., Hidalgo, P., and Cruz, E.(1989). “Response modification factors for earthquake resistance design of short period buildings.” Earthquake Spectra, 5(3), 571–590.
Uang, C. M.(1991). “Establishing R (or ) and factors for building seismic provisions.” J. Struct. Eng. (India), 117(1), 19–28.
Uang, C.-M. (1992). “Seismic force reduction and displacement amplification factors.” Proc., 10th WCEE Conf., Madrid, Spain, 5875–5880.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 128 • Issue 2 • February 2002
Pages: 179 - 187
Copyright
Copyright © 2002 American Society of Civil Engineers.
History
Received: Mar 14, 2000
Accepted: May 15, 2001
Published online: Feb 1, 2002
Published in print: Feb 2002
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.