to verify and develop Beal's graphical method of buckling analysis con®rms that Beal's method is accurate and eective, giving results which agree well with experimental data. The method provides a powerful analytical tool, allowing fast determination of the column capacity for a wide range of slenderness and loading conditions. It is used here to investigate the behaviour of normal-and high-strength concrete columns under both axial and eccentric loads and with a variety of slenderness ratios and reinforcement proportions. The results of this accurate analysis are used as a benchmark for the assessment of code of practice design rules. Existing BS 8110 design rules are found to give poor agreement with both the theoretical analysis and experimental results. New design rules which give more consistent and accurate results are proposed.
This paper presents a study into the effect of longitudinal reinforcement ratio on the shear behavior of Recycled Aggregates Concrete beams (RAC). Six beams were cast in two series: first series includes three beams with ρ=1.04% and the second series includes three beams with ρ=1.5%. The first beam of each series was cast with natural coarse aggregates (R0) to serve as control beam. The second beam was made with 50% replacement ratio of coarse aggregates (R50) and the third beam was made entirely with recycled concrete aggregates (R100). The shear span was constant for all beams a/d=3.5. The beams were subjected to four point loading test. Beams' deflection, crack patterns, yielding, ultimate shear capacity; and failure modes are all observed and analyzed. Significant increase in the shear strength was recorded as longitudinal reinforcement ratio increases by 0.5%. ACI Code provisions for predicting the concrete shear capacity tends to become more conservative with increasing ρ.
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