Abstract
The experimental study was made on the three dimensional elasto-plastic behavior of space frames consisted of two rigid frames in one direction and two tensile braced frames in the other direction which are general structural system of low steel structures. Test specimens were one story-one bay space frames constructed with four columns and four beams of H-shaped members and with four tensile braces of round steels, and were tested under horizontally loading combined with axial load. From these experimental results, the following difference of the elasto-plastic behavior of space frames from plane frames were clarified. 1. Additional axial force in columns caused by deformation of braced frames makes the difference to the restoring forces of two parallel rigid frames, and torsion of frame is accumulated with repetition of loading cycles. 2. The maximum restoring force and plastic deformation capacity in direction of strong axis of H-shaped columns decrease under the influence of the deformation of columns in direction of weak axis.
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