Two hysteretic models for thin-walled pipe-section steel bridge piers

This paper is a comparative study of two hysteretic models for seismic anal ysis of thin-walled pipe-section steel bridge piers: the integrated 2-param eter model and the damage based hysteretic model. Both models ore of multi- linear type and both take into consideration strength and stiffness degrada tion of thin-walled steel structures Jul to local buckling and P-Delta effe ct. It is found that under short-duration accelerograms, the predicted resp onses by the two models come pretty close to each other and both models can simulate pseudodynamic tests adequately; under some long-duration accelero grams, however, there are some significant differences in the predicted res ponses especially in residual displacement. While such differences warrant further experimental study, the constitutional difference that causes the b iggest disagreement is identified and recommendations are made as to the pr actical application of the two models. (C) 2000 Elsevier Science Ltd. All r ights reserved.