A PROPOSAL TO TBEC 2018 ON HIGH-STRENGTH CONCRETE STRESS DISTRIBUTION

Date

2023-1-27

Author

NURI, MURAD

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The use of high-strength concrete (HSC) has become increasingly popular since the beginning of the current millennium. Thanks to the greater strength per unit volume, it found widespread use in the construction of high-rise buildings and long-span prestressed bridges. In the 1960s, researchers started adding supplementary materials, initially superplasticizers, to the concrete mix to increase the strength of concrete. The theoretical research of the material on the academic level is older than its practical use. It dates back to the 1980s when researchers started to examine the mechanical properties of the material. Although it has been more than forty years since researchers began experimenting with structural elements of HSC, the major international codes have not made extensive additions to the code requirements regarding HSC. One of the design codes not including requirements for HSC extensively is TBEC 2018, which refers to Eurocode 2 for the use of equivalent rectangular stress-block parameters for concrete grades over 50 MPa. The current study aims to eliminate this need and propose a new expression for stress-block parameters for structural elements with concrete grades over 50 MPa. Additionally, a new factor of reduction is proposed for the overall axial and bending moment capacity of HSC columns of over 80 MPa due to premature cover spalling, the effect that is present in HSC columns. The results of ultimate section capacity calculations due to proposed expressions are examined and verified against experimental results of research publications from 1995 to 2021.

Subject Keywords

High-Strength Concret, Equivalent Rectangular Stress-Block Parameters, Yüksek Dayanınmlı Beton, Eşdeğer Dikdörtgen Gerilme Bloğu Parametrelerİ

URI

https://hdl.handle.net/11511/110426

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Graduate School of Natural and Applied Sciences, Thesis