Method of calculating temperature crack resistance of concrete and kinetics of temperature cracks in mass concrete of hydraulic structures

Autor: L. P. Trapeznikov
Rok vydání: 1981
Předmět:
Zdroj: Hydrotechnical Construction. 15:383-391
ISSN: 1570-1468
0018-8220
DOI: 10.1007/bf01426659
Popis: 1. A method is proposed for calculating the temperature crack resistance of concrete and kinetics of temperature cracks based on a two-parameter model of fracture of concrete in tension. 2. The condition of exhaustion of temperature crack resistance is defined as the condition of formation of prefracture zones in concrete. It is equivalent to the condition of normal tensile stresses exceeding a certain limit value, which can be interpreted as the longtime strength of concrete which depends, in particular, on the age and creep of the material and the history of the stress-strain state. 3. Temperature crack resistance was investigated for four variants of constructing the columnar masses of the Sayano-Shushenskoe concrete dam, and the kinetics of crack development for one variant of construction. The calculations make it possible to determine the temperature regime for which it is possible to avoid the occurrence of a main crack, in particular, to evaluate the effectiveness of such known measures as cooling of the concrete mix and pipe cooling of the concrete. 4. The calculations show that situations in which the depth of cracks is small and there is no tendency toward its further development are possible. In such cases the condition of crack resistance can be replaced by the less stringent condition of limiting the crack length. 5. The results of the calculations do not contradict the existing notions about the conditions of occurrence of temperature cracks, their location, and characteristics of development.
Databáze: OpenAIRE
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