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Crack Mechanism In Thick Concrete Structures During Hydration

 Crack Mechanism In Thick Concrete Structures During Hydration
Autor(en):
Beitrag für IABSE Symposium: Large Structures and Infrastructures for Environmentally Constrained and Urbanised Areas, Venice, Italy, 22-24 September 2010, veröffentlicht in , S. 110-111
DOI: 10.2749/venice.2010.0110
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According to the existing design codes reinforced concrete structures have to be dimensioned with a minimum reinforcement, which avoids big cracks at the time when first cracks appear. For thick co...
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Bibliografische Angaben

Autor(en):
Medium: Tagungsbeitrag
Sprache(n): Englisch
Tagung: IABSE Symposium: Large Structures and Infrastructures for Environmentally Constrained and Urbanised Areas, Venice, Italy, 22-24 September 2010
Veröffentlicht in:
Seite(n): 110-111 Anzahl der Seiten (im PDF): 8
Seite(n): 110-111
Anzahl der Seiten (im PDF): 8
Jahr: 2010
DOI: 10.2749/venice.2010.0110
Abstrakt:

According to the existing design codes reinforced concrete structures have to be dimensioned with a minimum reinforcement, which avoids big cracks at the time when first cracks appear. For thick concrete structures this leads to an uneconomic amount of reinforcement. To avoid separate reduction factors it is easier to remember that restraint is a problem of deformation compatibility.

Nonlinear finite element analysis were performed to study the crack mechanism. If the restrained deformation due to the discharge of the heat of hydration is known, deformation compatibility can be reached with primary and secondary cracks. The amount of reinforcement has to ensure that the needed number of secondary cracks can occur and that the crack width is limited as wanted. A simplified, robust and mechanical consistent algorithm can be achieved. It leads to an economic reinforcement percentage, which is confirmed to reach the goal of crack width control from the experience.

Stichwörter:
Hydratation