Factored Modal Combination for Evaluation of Earthquake Load Profiles
Publication: Journal of Structural Engineering
Volume 133, Issue 7
Abstract
To accurately predict the inelastic earthquake response of a structure by pushover analysis, the prescribed load profiles should be consistent with the actual force profiles which develop maximum design values during the time-history response of the structure. In the present study, a new modal combination method, factored modal combination (FMC), was developed to predict the earthquake load profiles of building structures affected by higher dynamic modes. In the FMC, multiple story load profiles are predicted by combining the modal spectrum responses multiplied by the modal combination factors. Based on the results of parametric studies on moment-resisting frames and walls, the modal combination factors were defined according to the hierarchy of each mode affecting the dynamic responses of structures. The FMC was applied to prototype buildings with and without vertical irregularity. The results showed that the FMC predicted the actual story load profiles which developed during the elastic and inelastic time-history responses of the structures.
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Acknowledgments
This research was financially supported by the Ministry of Construction and Transportation of Korea (03 R&D C04-01 and 04 R&D C02-02). The writers are grateful to the authorities for their support.
References
Applied Technology Council (ATC). (1996). “Seismic evaluation and retrofit of concrete buildings.” ATC-40 Rep., Redwood City, Calif.
Applied Technology Council (ATC). (2005). “Improvement of nonlinear static seismic analysis procedures.” FEMA 440 Rep., Federal Emergency Management Agency, Washington, D.C.
Architectural Institute of Korea (AIK). (2005). “Korean building code-structural.” Ministry of Construction and Transportation of Korea, Seoul.
ASCE. (2000). “Prestandard and commentary for the seismic rehabilitation of buildings.” FEMA 356 Rep., Federal Emergency Management Agency, Washington, D.C.
Chopra, A. K., and Goel, R. K. (2002). “A modal pushover analysis procedure for estimating seismic demands for buildings.” Earthquake Eng. Struct. Dyn., 31(3), 561–582.
Kunnath, S. K. (2004). “Identification of modal combinations for nonlinear static analysis of building structures.” Comput. Aided Civ. Infrastruct. Eng., 19(4), 246–259.
Lee, D., Choi, W., and Ahn, J. (2002). “Improved distribution of seismic forces for evaluation of nonlinear seismic response of building structures.” J. Earthquake Eng., 5(2), 33–47.
Matsumori, T., Otani, S., Shiohara, H., and Kabeyasawa, T. (1999). “Earthquake member deformation demands in reinforced concrete frame structures.” Proc., U.S.-Japan Workshop on Performance-Based Earthquake Engineering Methodology for RC Building Structures, PEER Center Rep., Univ. of California, Berkeley.
Powell, G. H. (1993). “DRAIN-2DX element description and user guide for element Type01, Type02, Type04, Type06, Type09, and Type15—Version 1.10.” Rep. No. UCB/SEMM-93/18, Proc., Structural Engineering Mechanics and Materials, Univ. of California, Berkeley, Calif.
Prakash, V., Powell, G. H., and Campbell, S. (1993). “DRAIN-2DX base program description and user guide—Version 1.10.” Rep. No. UCB/SEMM-93/17, Proc., Structural Engineering Mechanics and Materials, Univ. of California, Berkeley, Calif.
Priestley, M. J. N. (2000). “Performance based seismic design.” Proc., 12th World Conf. on Earthquake Engineering, Auckland, New Zealand.
Requena, M., and Ayala, A. G. (2000). “Evaluation of a simplified method for the determination of the nonlinear seismic response of RC frames.” Proc., 12th World Conf. on Earthquake Engineering, Auckland, New Zealand.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 133 • Issue 7 • July 2007
Pages: 956 - 968
Copyright
© 2007 ASCE.
History
Received: Jun 26, 2006
Accepted: Jan 8, 2007
Published online: Jul 1, 2007
Published in print: Jul 2007
Notes
Note. Associate Editor: Rakesh K. Goel
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