Experimental Investigation on Post-tensioned Spannglass Beams during Temperature Loads

Recent research work focused on material efficient and safe structural use of glass beams. Reinforcing and post-tensioning of those structures in the style of reinforced concrete are promising options. They allow for a safe post-breakage behaviour of load bearing glass constructions. Other ductile...

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Autores principales: M. Engelmann, P. Bukieda, B. Weller
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Lenguaje:EN
Publicado: Challenging Glass Conference 2016
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spelling oai:doaj.org-article:e52eeac3bb6e4dbd8ebb2f5fc4deb2822021-12-04T05:12:28ZExperimental Investigation on Post-tensioned Spannglass Beams during Temperature Loads10.7480/cgc.5.22422589-8019https://doaj.org/article/e52eeac3bb6e4dbd8ebb2f5fc4deb2822016-06-01T00:00:00Zhttps://proceedings.challengingglass.com/index.php/cgc/article/view/197https://doaj.org/toc/2589-8019 Recent research work focused on material efficient and safe structural use of glass beams. Reinforcing and post-tensioning of those structures in the style of reinforced concrete are promising options. They allow for a safe post-breakage behaviour of load bearing glass constructions. Other ductile materials such as steel and high-grade cables strengthen the glass, which results in robust structures. However, hybrid structures are prone to temperature loads. Especially post-tensioned glass beams – Spannglass Beams – are vulnerable to lose part of their initial cable load caused by a different expansion of their parts. The thermal expansion coefficient of steel cables is about 70% larger than the value of glass. Therefore, a cable in a hybrid structure will expand much more during heating. This effect results in a loss in initial cable load of a post-tensioned reinforcement, and cannot be prevented. Hence, the temperature dependency needs to be considered during the design stage. Furthermore, a change in temperature influences the material properties of glass-contact materials and the interlayer. Thermoplastic blockings transfer the cable load into the laminated glass edge. Due to manufacturing tolerances, the interlayer material is stressed. Therefore, this will affect the reaction of the structure to a change in temperature. The non-destructive experimental study includes the results of a set of two Spannglass Beams with 8 mm post-tensioned cables. Adhesively bonded connectors redirect the cables according to the needs in a four-point bending set-up. Two-meter long beams were placed in a climate chamber to heat the specimens from ambient temperature to 60°C. We recorded the structural behaviour at alternating initial cable loads as well as different bending loads. Finally, the results led to a recommendation on how to consider a possible loss in cable load caused by a change in temperature. This will support the argumentation that post-tensioning glass beams is a feasible structural option. M. EngelmannP. BukiedaB. WellerChallenging Glass Conferencearticleglass beampost-tensioningreinforcementtemperature loadtemperature compensationspannglassClay industries. Ceramics. GlassTP785-869ENChallenging Glass Conference Proceedings, Vol 5 (2016)
institution DOAJ
collection DOAJ
language EN
topic glass beam
post-tensioning
reinforcement
temperature load
temperature compensation
spannglass
Clay industries. Ceramics. Glass
TP785-869
spellingShingle glass beam
post-tensioning
reinforcement
temperature load
temperature compensation
spannglass
Clay industries. Ceramics. Glass
TP785-869
M. Engelmann
P. Bukieda
B. Weller
Experimental Investigation on Post-tensioned Spannglass Beams during Temperature Loads
description Recent research work focused on material efficient and safe structural use of glass beams. Reinforcing and post-tensioning of those structures in the style of reinforced concrete are promising options. They allow for a safe post-breakage behaviour of load bearing glass constructions. Other ductile materials such as steel and high-grade cables strengthen the glass, which results in robust structures. However, hybrid structures are prone to temperature loads. Especially post-tensioned glass beams – Spannglass Beams – are vulnerable to lose part of their initial cable load caused by a different expansion of their parts. The thermal expansion coefficient of steel cables is about 70% larger than the value of glass. Therefore, a cable in a hybrid structure will expand much more during heating. This effect results in a loss in initial cable load of a post-tensioned reinforcement, and cannot be prevented. Hence, the temperature dependency needs to be considered during the design stage. Furthermore, a change in temperature influences the material properties of glass-contact materials and the interlayer. Thermoplastic blockings transfer the cable load into the laminated glass edge. Due to manufacturing tolerances, the interlayer material is stressed. Therefore, this will affect the reaction of the structure to a change in temperature. The non-destructive experimental study includes the results of a set of two Spannglass Beams with 8 mm post-tensioned cables. Adhesively bonded connectors redirect the cables according to the needs in a four-point bending set-up. Two-meter long beams were placed in a climate chamber to heat the specimens from ambient temperature to 60°C. We recorded the structural behaviour at alternating initial cable loads as well as different bending loads. Finally, the results led to a recommendation on how to consider a possible loss in cable load caused by a change in temperature. This will support the argumentation that post-tensioning glass beams is a feasible structural option.
format article
author M. Engelmann
P. Bukieda
B. Weller
author_facet M. Engelmann
P. Bukieda
B. Weller
author_sort M. Engelmann
title Experimental Investigation on Post-tensioned Spannglass Beams during Temperature Loads
title_short Experimental Investigation on Post-tensioned Spannglass Beams during Temperature Loads
title_full Experimental Investigation on Post-tensioned Spannglass Beams during Temperature Loads
title_fullStr Experimental Investigation on Post-tensioned Spannglass Beams during Temperature Loads
title_full_unstemmed Experimental Investigation on Post-tensioned Spannglass Beams during Temperature Loads
title_sort experimental investigation on post-tensioned spannglass beams during temperature loads
publisher Challenging Glass Conference
publishDate 2016
url https://doaj.org/article/e52eeac3bb6e4dbd8ebb2f5fc4deb282
work_keys_str_mv AT mengelmann experimentalinvestigationonposttensionedspannglassbeamsduringtemperatureloads
AT pbukieda experimentalinvestigationonposttensionedspannglassbeamsduringtemperatureloads
AT bweller experimentalinvestigationonposttensionedspannglassbeamsduringtemperatureloads
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