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SUMMARYA one-dimensional model is proposed for the static and dynamic analysis of tubular steel bridge piers subjected to strong ground motions. The present formulation does not require experimental results nor shell analysis to obtain the constitutive equation of the model, which shows strength deterioration. The material properties and dimensions of bridge piers are required for static and dynamic analysis of the present model. The present analysis consists of two steps. The ÿrst step is to obtain the stress and strain relationship of the base plastic-hinge region, where local inelastic buckling is observed. The modiÿed Shanley's model and ÿber elements are used to establish the compressive skeleton curve. The strength deterioration is taken into account in the resulting constitutive model. The second step is to analyze static and dynamic responses of tubular steel bridge piers. For overall analysis, the base plastic-hinge region is discretized in the circumferential direction by using ÿber elements whose constitutive equation was obtained in the ÿrst step. The validity of the present model has been conÿrmed through comparisons with existing experimental results.

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