Creep and cracking of concrete hinges: insight from centric and eccentric compression experiments
| Autor: | Susanne Gmainer, Bernhard Pichler, Martin Peyerl, Michael Schweigler, Thomas Schlappal |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Ultimate load
Materials science 0211 other engineering and technologies Hinge 02 engineering and technology 021105 building & construction Ultimate tensile strength General Materials Science Geotechnical engineering 021101 geological & geomatics engineering Civil and Structural Engineering Normal force business.industry Digital image correlation Segmented tunnel lining Building and Construction Structural engineering Compression (physics) Integral bridge construction Cracking Tensile cracking of concrete Creep Mechanized tunneling Mechanics of Materials Solid mechanics Original Article business |
| Zdroj: | Materials and Structures |
| ISSN: | 1871-6873 1359-5997 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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