Studies on Seismic-Inelastic Behavior of Reinforced Concrete Spandrel-Beams

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(1) PURPOSES A focus of this study is to discuss the seismic-inelastic behavior of reinforced concrete spandrel-beams which are affected by the varius parameters : 1) depth-width ratios of the beam cross-section. 2) shear span ratios. 3) web reinforcement ratios. etc. Another focus is to investigate the behavior of axial beam-deformation after flexural cracks by the test obsevation. And to simulate the strength-deformation relationships of the beams whose axial deformation is restrained externally.(2) METHOD The static failure tests of 27 reinforced concrete spandrel-beams with various parameters are conducted, and the results are analized. The simulation for the strength-deformation relationships of spandrel-beams is compared with the results observed by the tests.(3) RESULTS The results obtained from this study are summarized as follows. 1) The flexure-yield-point of spnaderel-beams, whose axial steel-bars are placed as multi-layer reinforcement, is identified by the yieding of beam-bars. 2) The spandrel-beams whose deformation are restrained axially develop their flexure-strength. Being assumed the axial forces developed by the restraint of axial deformation, the ultimate theory becomes available for the estimation of the flexure-capacity. 3) The restraint-forces increased with the flexure deformation are assumed easily by the use of the rigid-body-model. 4) The floor-slabs don't affect the restraint of axial deformation, but they relate the flexure-capacity of the spandrel-beams. 5) The shear reinforcements are needed more than those required by shear-design of the member, in case that the ductility are required more than 1/100. 6) The interval of the stirrups should be less than six times of the diameter of the compression-bar for buckling-prevention and ductility-improvement.