The Earthquake Engineering Online Archive

Phenomenological modeling of steel braces under cyclic loading

Ikeda, Kiyohiro; Mahin, Stephen A.; Dermitzakis, Stavros N.

UCB/EERC-84/09, Earthquake Engineering Research Center, University of California, Berkeley, 1984-05, 148 pages (530/I41/1984)

A refined analytical model is presented for simulation of the inelastic buckling behavior of steel braces. The buckling is simulated by use of pre-defined straight-line segments and simple rules regarding such factors as buckling load deterioration and plastic growth. The model, based on the approach of Maison et al., overcomes some of the limitations of earlier models. The research attempts to facilitate the selection of control input parameters. A systematic method for selecting input parameters is proposed along with several rules governing the values of certain parameters. Input parameters for 24 different braces are presented based on available experimental results. Generalized parameters for commonly used types of sections are derived on the basis of these specific parameters. A series of simple quasistatic analyses were undertaken to evaluate the capability of the new model and the validity of the methods for the selection of the input parameters proposed. A computer program is developed to incorporate the new model; the program user guide is included.

Available online: http://nisee.berkeley.edu/documents/EERC/EERC-84-09.pdf (8 MB)