## High-strength concrete beams |

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ACI Code ASTM Axial Stress-Strain Curves Beam Series Beams A-3a behavior C-specimen centroid compression reinforcement compression zone compressive steel compressive stress Concrete Compressive Strength concrete strain concrete strength cover concrete crack spacings curvature ductility Curves for Series cylinders descending branch ductility index eccentric compression Eqns equation experimental extreme compression fiber failure flexural curves flexural members Flexural Stress-Strain Curves Fly Ash high strength HSC beams limiting compressive strain linear linear regression load-strain LSC and MSC maximum stress Measured and Predicted midspan modulus of elasticity neutral axis depth prestressed pure bending Rebar Region of Beam reinforced concrete Series B Beams service load shown in Fig Singly Reinforced Beams steel strain strain at maximum Strain Curves Strain Gages strain gradient strain hardening stress distribution stress-strength parameters Stussi Surface Crack Widths tensile steel ratio tension reinforcement test region transverse reinforcement U.S. Customary units ultimate load unconfined values yield