| Description |
xii, 107 leaves : illustrations ; 29 cm |
| Summary |
"The purpose of this study is to determine the limitations of the plastic behavior of reinforced concrete beams with varying percentages of high strength steel (ASTM-A-432) cutoff in the compression region d distance beyond the point of inflection. Comparison was made with the derived equations. Steel was placed symmetrically in order to obtain like action at critical sections. The members tested were of a propped beam nature having a total clear span of 5'6" with a 6" overhang on one end and 1'6" overhang on the other. Concentrated loads were applied so as to obtain midspan loading and fixed end conditions at only one end. Beam sections were 3" X 6" with a 5 1/4 depth to steel. Reinforcing cover requirements were not met (American Concrete Institute) due to the limited size of sections. Shear reinforcing consisted of closed loop stirrups made from no. 9 gage wire. Electric Sr-4 strain gages were applied to the steel and concrete at all critical sections in order to obtain moment-curvature relationships. Dial gages were used to obtain the deflection at midspan. Of the eight speciments tested, three had shear-bond failures at or near the point of inflection, thus limiting the plastic design theory for reinforcing that is symmetrically placed in beams of this kind. The moment and load deflection curves compared favorably with theory except for the high percentages of steel"--Abstract, leaf ii. |
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