Title: Creep and cracking of concrete hinges: insight from centric and eccentric compression experiments
Language: English
Authors: Schlappal, Thomas 
Schweigler, Michael 
Gmainer, Susanne 
Peyerl, Martin 
Pichler, Bernhard 
Category: Research Article
Issue Date: 2017
Journal: Materials and Structures
ISSN: 1359-5997
Existing design guidelines for concrete hinges consider bending-induced tensile cracking, but the structural behavior is oversimplified to be time-independent. This is the motivation to study creep and bending-induced tensile cracking of initially monolithic concrete hinges systematically. Material tests on plain concrete specimens and structural tests on marginally reinforced concrete hinges are performed. The experiments characterize material and structural creep under centric compression as well as bending-induced tensile cracking and the interaction between creep and cracking of concrete hinges. As for the latter two aims, three nominally identical concrete hinges are subjected to short-term and to longer-term eccentric compression tests. Obtained material and structural creep functions referring to centric compression are found to be very similar. The structural creep activity under eccentric compression is significantly larger because of the interaction between creep and cracking, i.e. bending-induced cracks progressively open and propagate under sustained eccentric loading. As for concrete hinges in frame-like integral bridge construction, it is concluded (i) that realistic simulation of variable loads requires consideration of the here-studied time-dependent behavior and (ii) that permanent compressive normal forces shall be limited by 45% of the ultimate load carrying capacity, in order to avoid damage of concrete hinges under sustained loading.
Keywords: Integral bridge construction; Mechanized tunneling; Segmented tunnel lining; Tensile cracking of concrete; Digital image correlation
DOI: 10.1617/s11527-017-1112-9
Library ID: AC15321003
URN: urn:nbn:at:at-ubtuw:3-4879
Organisation: E202 - Institut für Mechanik der Werkstoffe und Strukturen 
Publication Type: Article
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