Inelastic Link Element for EBF Seismic Analysis
Publication: Journal of Structural Engineering
Volume 120, Issue 2
Abstract
A formulation for modeling links in eccentrically braced steel frames (EBFs) subjected to random inelastic cyclic loading is presented. The formulation is plasticity‐based, and includes shear and flexural yielding. In addition, combined isotropic and kinematic shear strain‐hardening effects are accounted for, as well as flexural strain hardening. The formulation is shown to accurately predict the behavior of test specimens involving short links. Inelastic seismic analysis of EBFs with short links was conducted to illustrate the effect of link‐modeling assumptions on EBF response. The analysis results show that link strain hardening can have a pronounced effect on EBF response, leading to larger member forces in braces and columns attached to the links. Furthermore, combined flexural and shear yielding occurred in the links adjacent to columns, indicating the need to include these types of inelastic deformations in the link‐modeling formulation. Finally, the use in the analysis of viscous damping in the link was found to cause excessive axial forces to develop in braces and columns adjacent to yielded links. To reduce this effect, a form of nonproportional viscous damping is illustrated.
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References
1.
Chen, P. F., and Powell, G. H. (1982). “Generalized plastic hinge concepts for 3D beam‐column elements.” EERC Report No. 82‐20, Earthquake Engrg. Res. Ctr., Univ. of California, Berkeley, Calif.
2.
Clough, R. W., Benuska, K. L., and Lin, T. Y. (1966). “FHA study of seismic design criteria for high‐rise buildings.” HUDTS‐3, Federal Housing Administration, Washington, D.C.
3.
Gilberson, M. F. (1969). “Two nonlinear beams with definitions of ductility.” J. Struct. Engrg., ASCE, 95(2), 137–157.
4.
Hjelmstad, K. D., and Popov, E. P. (1983). “Seismic behavior of active beam links in eccentrically braced frames.” EERC Report No. 83‐15, Earthquake Engrg. Res. Ctr., Univ. of California, Berkeley, Calif.
5.
Hodge, P. G. (1959). Plastic analysis of structures. McGraw‐Hill, New York, N.Y.
6.
Kasai, K., and Goyal, A. (1993). “Link length design and EBF seismic performance.” Proc., 11th Structures Congress, ASCE, New York, N.Y., 397–402.
7.
Kasai, K., and Popov, E. P. (1986). “General behavior of WF steel shear link beams.” J. Struct. Engrg., ASCE, 112(2), 362–382.
8.
Mroz, Z. (1967). “On the description of anisotropic workhardening.” J. Mech. Physics of Solids, 15, 163–175.
9.
Mroz, Z. (1969). “An attempt to describe the behavior of metals under cyclic loads using a more general workhardening model.” Acta Mechanica, 7(2–3), 199–212.
10.
Neal, B. G. (1961). “Effect of shear force on the fully plastic moment of an I beam.” J. Mech. Engrg. Sci., 3(3), 258–266.
11.
Nigam, N. C. (1970). “Yielding in frames structures under dynamic loads.” J. Engrg. Mech., ASCE, 96(5), 687–709.
12.
Popov, E. P., Ricles, J. M., and Kasai, K. (1992). “EBF design methodology for optimized inelastic link behavior.” Proc., 10th World Conf. on Earthquake Engineering, Vol. 7, A. A. Batkerna, Rotterdam, the Netherlands, 3983–3988.
13.
Porter, F. L., and Powell, G. H. (1971). “Static and dynamic analysis of inelastic frame structures.” EERC Report No. 71‐3, Earthquake Engrg. Res. Ctr., Univ. of California, Berkeley, Calif.
14.
Ricles, J. M., and Popov, E. P. (1987a). “Dynamic analysis of seismically resistant eccentrically braced frames.” EERC Report No. 87‐07, Earthquake Engrg. Res. Ctr., Univ. of California, Berkeley, Calif.
15.
Ricles, J. M., and Popov, E. P. (1987b). “Experiments on eccentrically braced frames with composite floors.” EERC Report No. 87‐06, Earthquake Engrg. Res. Ctr., Univ. of California, Berkeley, Calif.
16.
Ricles, J. M., and Popov, E. P. (1989). “Composite action in eccentrically braced steel frames.” J. Struct. Engrg., ASCE, 115(8), 2046–2066.
17.
Ricles, J. M., and Bolin, S. (1991). “Seismic performance of eccentrically braced frames.” UCSD Structural Systems Report No. 91‐09, Univ. of California, San Diego, Calif.
18.
Roeder, C. W., and Popov, E. P. (1977). “Inelastic behavior of eccentric braced steel frames under cyclic loadings.” EERC Report No. 77‐18, Earthquake Engrg. Res. Ctr., Univ. of California, Berkeley, Calif.
19.
Row, D. G., Powell, G. H., and Mondkar, D. P. (1979). “2D beam column element (Type 5—Parallel element theory) for the ANSR‐II program.” EERC Report No. 79‐30, Earthquake Engrg. Res. Ctr., Univ. of California, Berkeley, Calif.
20.
Whittaker, A. S., Uang, C. M., and Bertero, V. V. (1987). “Earthquake simulation tests and associated studies of a 0.3‐scale model of a six‐story eccentrically braced steel structure.” EERC Report No. 87‐02, Earthquake Engrg. Res. Ctr., Univ. of California, Berkeley, Calif.
21.
Yang, M. S. (1982). “Seismic behavior of an eccentrically X‐braced steel structure.” EERC Report No. 82‐14, Earthquake Engrg. Res. Ctr., Univ. of California, Berkeley, Calif.
22.
Ziegler, H. (1959). “A modification of Prager's hardening rule.” Q. of Appl. Math., 17(1), 55–65.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 120 • Issue 2 • February 1994
Pages: 441 - 463
Copyright
Copyright © 1994 American Society of Civil Engineers.
History
Received: Jan 19, 1993
Published online: Feb 1, 1994
Published in print: Feb 1994
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