Abstract
This paper presents some excellent numerical results of collapse analysis on an RC-steel hybrid frame used in a school gymnasium. The analyses are done by the fibered plastic hinge method. The limit bending moment and the limit shear force of the column base of the upper steel frame and the limit overturning moment of the RC base are checked in the analysis according to a currently recommended evaluation method. The bending strength of the footing is also checked. The influences of eccentricity between the chord members and the lattice members are taken into account. The numerical result is an upper bound solution, and at the same time, a lower bound solution for the idealized numerical model. The results are compared with those obtained by the conventional α-method.
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