Flexural Strength of Ultra-High Strength Concrete Membersby Sung-woo Shin, Han Yang Univ, Republic of Korea,
S. K. Ghosh, Han Yang Univ, Republic of Korea,
Abstract: Various proposals have been made for the pridiction of strength of high strength concrete sections. One of the most important parts of any strength computation procedure is the assumption of a suitable compression concrete stress block. Another important aspect of a strength prediction procedure is the assignment of a value to the ultimate compression strain of concrete Eu and the value of Ec. These investigations were undertaken to address those concerns. A rectangular stress block of the ACI code(1) was also forwarded to give acceptably conservative strength predictions over the entire range of concrete strength from 27.6 MPa (4Ksi) to 103.5 MPa (15Ksi). Some of the measured maximum extreme compression fiber strain do fall below 0.003 at high concrete strength. Eu= 0.0025 would be a more conservative lower bound.
Subject Headings: Concrete blocks | Structural strength | High-strength concrete | Compressive strength | Compression | Strain
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