Period‐Dependent Effects in Seismic Torsional Response of Code Systems
Publication: Journal of Structural Engineering
Volume 120, Issue 12
Abstract
The primary objective of code torsional provisions is to limit to acceptable levels the element ductility demands and deformations in plan‐eccentric structural systems. Such levels are determined from well‐established seismic design criteria applied to the appropriately defined reference systems. Information is available from comprehensive recent studies focusing on the effectiveness of code torsional provisions in meeting that objective. The major controlling factors have been identified as the total design strength incorporated in plan‐eccentric structures and its code‐dependent distribution among the lateral load‐resisting elements. The results and conclusions of these related studies have been based on a comparison of the response of elements in plan‐eccentric systems with that of the corresponding element in the selected reference system. This paper demonstrates that when a reference model is adopted that adheres rigorously to the design regulations of codes, including provisions for so‐called accidental torsional effects, significant period dependency of inelastic seismic torsional response behavior is revealed. To demonstrate this, a reevaluation of the equivalent static torsional design procedures of codes is presented.
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References
1.
Chandler, A. M., and Duan, X. N. (1991). “Evaluation of factors influencing the inelastic seismic performance of torsionally asymmetric buildings.” Earthquake Engrg. and Struct. Dyn., 20(1), 87–95.
2.
Chandler, A. M., and Hutchinson, G. L. (1992). “Effect of structural period and ground motion parameters on the earthquake response of asymmetric buildings.” Engrg. Struct., 14(6), 354–360.
3.
Chopra, A. K., and Goel, R. K. (1991). “Evaluation of torsional provisions in seismic codes.” J. Struct. Engrg., ASCE, 117(12), 3762–3782.
4.
Correnza, J. C., Hutchinson, G. L., and Chandler, A. M. (1992). “A review of reference models for assessing inelastic seismic torsional effects in buildings.” Soil Dyn. and Earthquake Engrg., 11(8), 465–484.
5.
Duan, X. N., and Chandler, A. M. (1993). “Inelastic seismic response of code‐designed multistorey frame buildings with regular asymmetry.” Earthquake Engrg. and Struct. Dyn., 22(5), 431–445.
6.
Fishinger, M., and Fajfar, P. (1990). “The role of overstrength in seismic resistance of buildings.” Proc. 9th European Conf. on Earthquake Engrg., Moscow, U.S.S.R., 2, 329–338.
7.
National building code of Canada. (1990). Associate Committee on the National Building Code, National Res. Council of Canada, Ottawa, Ontario.
8.
New Zealand Standard NZS 4203: Code of practice for general structural design and esign loadings for buildings. (1992). Standards Assoc. of New Zealand, Wellington, New Zealand.
9.
Rutenberg, A., Eisenberger, M., and Shohet, G. (1992). “Inelastic seismic response of code designed single storey asymmetric structures.” Engrg. Struct., 14(2), 91–102.
10.
Standards Australia AS 1170.4: Minimum design load on structures. Part 4: Earthquake loads. (1993). Standards Australia Committee for Loading on Structures, Sydney, Australia.
11.
Tso, W. K., and Ying, H. (1992). “Lateral strength distribution specification to limit additional inelastic deformation of torsionally unbalanced structures.” Engrg. Struct., 14(4), 263–277.
12.
Tso, W. K., and Zhu, T. J. (1992). “Design of torsionally unbalanced structural systems based on code provisions I: Ductility demand.” Earthquake Engrg. and Struct. Dyn., 21(7), 609–627.
13.
Uniform building code. (1991). International Conference of Building Officials, Whittier, Calif.
14.
Zhu, T. J., and Tso, W. K. (1992). “Design of torsionally unbalanced structural systems based on code provisions II: Strength distribution.” Earthquake Engrg. and Struct. Dyn., 21(7), 629–644.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 120 • Issue 12 • December 1994
Pages: 3418 - 3434
Copyright
Copyright © 1994 American Society of Civil Engineers.
History
Received: Nov 30, 1992
Published online: Dec 1, 1994
Published in print: Dec 1994
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