ELASTOPLASTIC ANALYSIS OF STEEL-CONCRETE COMPOSITE MEMBERS AND FRAMES COLLAPSED DUE TO BENDING

The beam element for three-dimensional pure steel frames proposed by the first author is extended for steel-concrete composite members. The authors call this approach the ” fibered plastic hinge method”. The stress-strain relation of a concrete fiber is modeled as an elastic-perfectly plastic type in this study. Comparisons with the authors' experimental results on RC beams strengthened by carbon fiber sheet and available test results on steel-concrete composite columns and frames show that the developed beam element has a sufficient accuracy for bending problem although there are some limitations. The element may be used to examine a performance of moment-resistant steel-concrete composite frames.