Abstract
Stiffness in elastic range, flexural cracking strength, ultimate flexure strength and restoring force characteristics of beams with spandrel walls were analyzed, and followings were discussed. 1) The stiffness in elastic range would be estimated without making remarkable error by using the substituted rectangular cross-section, where the inertia moment was equivalent to the original cross-section. 2) The flexural cracking strength and the ultimate flexure strength could be calculated by the equations shown in this paper, in which the calculated values agreed well the test results. 3) The stiffness degradation at yielding strength, proposed by Dr. Sugano, would be applied to the calculations of the deformations at the ultimate flexure strength by using the substituted cross-section mentioned above. 4) The restoring force characteristics of the beam with spandrel walls would be approximately expressed by two envelope curves, namely the virgin envelope curve up to the ultimate flexure strength and the envelope curve for the rectangular beam stem after the compression failure of spandrel walls.
