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2 2013

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Numerical model for analysis of early-age thermal-moisture effects in an RC wall

Klemczak B., Knoppik-Wróbel A.

Czasopismo Techniczne. Budownictwo

2013

R. 110, z. 1-B

95--114

The paper presents the original numerical model for simulation of thermal, moisture and mechanical effects in concrete structures with an example of application. The influence of different curing conditions on the temperature and moisture distribution in RC wall was investigated. The stress state and the damage intensity factor were determined and the areas of possible cracking were selected as well.

W artykule przedstawiono autorski model numeryczny do symulacji zjawisk termicznych, wilgotnościowych i mechanicznych w konstrukcjach betonowych wraz z przykładem jego zastosowania. Zbadano wpływ warunków betonowania i pielęgnacji na rozkład temperatur i wilgotności w ścianie żelbetowej. Wyznaczono stan naprężenia oraz wytężenia, określając również możliwe obszary zarysowania.

Comparison of analytical methods for estimation of early-age thermal-shrinkage stresses in RC walls

Klemczak B., Knoppik-Wróbel A.

Archives of Civil Engineering

2013

Vol. 59, nr 1

97--117

The volume changes caused by coupled temperature and moisture variations in early-age concrete elements lead to formation of stresses. If a restraint exists along the contact surface of mature concrete against which a new concrete element has been cast, generated stresses are mostly of a restraint origin. In engineering practice a wide range of externally restrained concrete elements can be distinguished such as tank walls or bridge abutments cast against an old set foundation, in which early-age cracking may endanger their durability or functionality. Therefore, for years methods were being developed to predict early-age stresses and cracking risk of externally restrained concrete elements subjected to early-age thermal-moisture effects. The paper presents the comparative study of the most recognised analytical approaches: the method proposed in EC2, the method proposed by ACI Committee 207 and the method developed at the Luleå University of Technology.