Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Design Compressive Strength Values of Concrete Under Sustained Loads
Abstract Experimental investigations on the material behaviour of concrete show, that the concrete compressive strength under sustained loads is lower than the short-term compressive strength. The effects of sustained loads are considered in EN 1992-1-1 (EC2) by the factor α cc for the design values of concrete compressive strength. In EC2, the factor α cc is proposed to be 1.00, while the National Annexes contain different values ranging between 0.85 and 1.00, in exceptional cases 1.20. In order to formulate a consistent solution, a new analysis of available experimental investigations from literature was carried out at the iBMB, Division of Concrete Construction of the TU Braunschweig. The results of this analysis indicate that for general application a value of 0.85 for the factor α cc is capturing the general conditions and hence leads to a safe design. Furthermore, the relations of the strength reduction under sustained compressive loads were examined and evaluated more exactly. In a new approach the factor α cc is formulated by a mathematical function, in which the strength gain due to post-hardening of concrete as well as the strength loss under sustained load are coupled. Using this new formulation, the compressive strength of concrete can be determined more exactly for different building conditions.
Design Compressive Strength Values of Concrete Under Sustained Loads
Abstract Experimental investigations on the material behaviour of concrete show, that the concrete compressive strength under sustained loads is lower than the short-term compressive strength. The effects of sustained loads are considered in EN 1992-1-1 (EC2) by the factor α cc for the design values of concrete compressive strength. In EC2, the factor α cc is proposed to be 1.00, while the National Annexes contain different values ranging between 0.85 and 1.00, in exceptional cases 1.20. In order to formulate a consistent solution, a new analysis of available experimental investigations from literature was carried out at the iBMB, Division of Concrete Construction of the TU Braunschweig. The results of this analysis indicate that for general application a value of 0.85 for the factor α cc is capturing the general conditions and hence leads to a safe design. Furthermore, the relations of the strength reduction under sustained compressive loads were examined and evaluated more exactly. In a new approach the factor α cc is formulated by a mathematical function, in which the strength gain due to post-hardening of concrete as well as the strength loss under sustained load are coupled. Using this new formulation, the compressive strength of concrete can be determined more exactly for different building conditions.
Design Compressive Strength Values of Concrete Under Sustained Loads
Brachmann, Georg (Autor:in) / Empelmann, Martin (Autor:in)
06.08.2017
8 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
A strength developing model of concrete under sustained loads
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A strength developing model of concrete under sustained loads
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A strength developing model of concrete under sustained loads
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