Experimental and Analytical Studies of U-Shaped Thin-Walled RC Beams Under Combined Actions of Torsion, Flexure and Shear

Abstract U-shaped thin-walled concrete bridge beams usually suffer the combined actions of flexure, shear and torsion, but no research about the behavior of U-shaped thin-walled RC beams under combined actions has been reported in literature. Three large specimens of U-shaped thin-walled RC beams we...
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Autor*in:	Jianchao Xu [verfasserIn] Shenggang Chen [verfasserIn] Quanquan Guo [verfasserIn] Yinghua Ye [verfasserIn] Bo Diao [verfasserIn] Y. L. Mo [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2018

Schlagwörter:	reinforced concrete U-shaped thin-walled beam combined action of torsion and flexure warping torsion ultimate load

Übergeordnetes Werk:	In: International Journal of Concrete Structures and Materials - SpringerOpen, 2013, 12(2018), 1, Seite 17
Übergeordnetes Werk:	volume:12 ; year:2018 ; number:1 ; pages:17

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc Journal toc

DOI / URN:	10.1186/s40069-018-0245-8

Katalog-ID:	DOAJ077700066

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520			\|a Abstract U-shaped thin-walled concrete bridge beams usually suffer the combined actions of flexure, shear and torsion, but no research about the behavior of U-shaped thin-walled RC beams under combined actions has been reported in literature. Three large specimens of U-shaped thin-walled RC beams were tested under different torque–bending moment ratios (T–M ratios) of 1:5, 1:1 and 1:0 to investigate the mechanical responses such as crack patterns, reinforcement strains, failure modes and ductility. The testing results showed that ductile flexural failures occurred for all three of the U-shaped thin-walled beam specimens, although the combined shear effect of circulatory torque, warping torque and shear force increased as the T–M ratio increased from 1:5 via 1:1 to 1:0, reflected by diagonal cracks and stirrup strains. More specifically, basically symmetrical flexural failure was dominated by the bending moment when the T–M ratio was 1:5; flexural failure of the loaded half of the U-shaped thin-walled section was dominated by the combined action of the bending moment and warping moment, while there were only a few cracks on the other half of the U-shaped section when the T–M ratio was 1:1; and anti-symmetrical flexural failure was dominated by the warping moment when the T–M ratio was 1:0 (pure torsion). A simple method to calculate the ultimate load of such U-shaped thin-walled RC beams under different T–M ratios was suggested, and the calculating results were corresponding well with the experimental results.
650		4	\|a reinforced concrete
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650		4	\|a warping torsion
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653		0	\|a Systems of building construction. Including fireproof construction, concrete construction
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allfields	10.1186/s40069-018-0245-8 doi (DE-627)DOAJ077700066 (DE-599)DOAJ06949f0839fd4d0099eefedeaa3d2bd1 DE-627 ger DE-627 rakwb eng TH1000-1725 Jianchao Xu verfasserin aut Experimental and Analytical Studies of U-Shaped Thin-Walled RC Beams Under Combined Actions of Torsion, Flexure and Shear 2018 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract U-shaped thin-walled concrete bridge beams usually suffer the combined actions of flexure, shear and torsion, but no research about the behavior of U-shaped thin-walled RC beams under combined actions has been reported in literature. Three large specimens of U-shaped thin-walled RC beams were tested under different torque–bending moment ratios (T–M ratios) of 1:5, 1:1 and 1:0 to investigate the mechanical responses such as crack patterns, reinforcement strains, failure modes and ductility. The testing results showed that ductile flexural failures occurred for all three of the U-shaped thin-walled beam specimens, although the combined shear effect of circulatory torque, warping torque and shear force increased as the T–M ratio increased from 1:5 via 1:1 to 1:0, reflected by diagonal cracks and stirrup strains. More specifically, basically symmetrical flexural failure was dominated by the bending moment when the T–M ratio was 1:5; flexural failure of the loaded half of the U-shaped thin-walled section was dominated by the combined action of the bending moment and warping moment, while there were only a few cracks on the other half of the U-shaped section when the T–M ratio was 1:1; and anti-symmetrical flexural failure was dominated by the warping moment when the T–M ratio was 1:0 (pure torsion). A simple method to calculate the ultimate load of such U-shaped thin-walled RC beams under different T–M ratios was suggested, and the calculating results were corresponding well with the experimental results. reinforced concrete U-shaped thin-walled beam combined action of torsion and flexure warping torsion ultimate load Systems of building construction. Including fireproof construction, concrete construction Shenggang Chen verfasserin aut Quanquan Guo verfasserin aut Yinghua Ye verfasserin aut Bo Diao verfasserin aut Y. L. Mo verfasserin aut In International Journal of Concrete Structures and Materials SpringerOpen, 2013 12(2018), 1, Seite 17 (DE-627)752436694 (DE-600)2724363-1 22341315 nnns volume:12 year:2018 number:1 pages:17 https://doi.org/10.1186/s40069-018-0245-8 kostenfrei https://doaj.org/article/06949f0839fd4d0099eefedeaa3d2bd1 kostenfrei http://link.springer.com/article/10.1186/s40069-018-0245-8 kostenfrei https://doaj.org/toc/1976-0485 Journal toc kostenfrei https://doaj.org/toc/2234-1315 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2027 GBV_ILN_2055 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4392 GBV_ILN_4700 AR 12 2018 1 17
spelling	10.1186/s40069-018-0245-8 doi (DE-627)DOAJ077700066 (DE-599)DOAJ06949f0839fd4d0099eefedeaa3d2bd1 DE-627 ger DE-627 rakwb eng TH1000-1725 Jianchao Xu verfasserin aut Experimental and Analytical Studies of U-Shaped Thin-Walled RC Beams Under Combined Actions of Torsion, Flexure and Shear 2018 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract U-shaped thin-walled concrete bridge beams usually suffer the combined actions of flexure, shear and torsion, but no research about the behavior of U-shaped thin-walled RC beams under combined actions has been reported in literature. Three large specimens of U-shaped thin-walled RC beams were tested under different torque–bending moment ratios (T–M ratios) of 1:5, 1:1 and 1:0 to investigate the mechanical responses such as crack patterns, reinforcement strains, failure modes and ductility. The testing results showed that ductile flexural failures occurred for all three of the U-shaped thin-walled beam specimens, although the combined shear effect of circulatory torque, warping torque and shear force increased as the T–M ratio increased from 1:5 via 1:1 to 1:0, reflected by diagonal cracks and stirrup strains. More specifically, basically symmetrical flexural failure was dominated by the bending moment when the T–M ratio was 1:5; flexural failure of the loaded half of the U-shaped thin-walled section was dominated by the combined action of the bending moment and warping moment, while there were only a few cracks on the other half of the U-shaped section when the T–M ratio was 1:1; and anti-symmetrical flexural failure was dominated by the warping moment when the T–M ratio was 1:0 (pure torsion). A simple method to calculate the ultimate load of such U-shaped thin-walled RC beams under different T–M ratios was suggested, and the calculating results were corresponding well with the experimental results. reinforced concrete U-shaped thin-walled beam combined action of torsion and flexure warping torsion ultimate load Systems of building construction. Including fireproof construction, concrete construction Shenggang Chen verfasserin aut Quanquan Guo verfasserin aut Yinghua Ye verfasserin aut Bo Diao verfasserin aut Y. L. Mo verfasserin aut In International Journal of Concrete Structures and Materials SpringerOpen, 2013 12(2018), 1, Seite 17 (DE-627)752436694 (DE-600)2724363-1 22341315 nnns volume:12 year:2018 number:1 pages:17 https://doi.org/10.1186/s40069-018-0245-8 kostenfrei https://doaj.org/article/06949f0839fd4d0099eefedeaa3d2bd1 kostenfrei http://link.springer.com/article/10.1186/s40069-018-0245-8 kostenfrei https://doaj.org/toc/1976-0485 Journal toc kostenfrei https://doaj.org/toc/2234-1315 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2027 GBV_ILN_2055 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4392 GBV_ILN_4700 AR 12 2018 1 17
allfields_unstemmed	10.1186/s40069-018-0245-8 doi (DE-627)DOAJ077700066 (DE-599)DOAJ06949f0839fd4d0099eefedeaa3d2bd1 DE-627 ger DE-627 rakwb eng TH1000-1725 Jianchao Xu verfasserin aut Experimental and Analytical Studies of U-Shaped Thin-Walled RC Beams Under Combined Actions of Torsion, Flexure and Shear 2018 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract U-shaped thin-walled concrete bridge beams usually suffer the combined actions of flexure, shear and torsion, but no research about the behavior of U-shaped thin-walled RC beams under combined actions has been reported in literature. Three large specimens of U-shaped thin-walled RC beams were tested under different torque–bending moment ratios (T–M ratios) of 1:5, 1:1 and 1:0 to investigate the mechanical responses such as crack patterns, reinforcement strains, failure modes and ductility. The testing results showed that ductile flexural failures occurred for all three of the U-shaped thin-walled beam specimens, although the combined shear effect of circulatory torque, warping torque and shear force increased as the T–M ratio increased from 1:5 via 1:1 to 1:0, reflected by diagonal cracks and stirrup strains. More specifically, basically symmetrical flexural failure was dominated by the bending moment when the T–M ratio was 1:5; flexural failure of the loaded half of the U-shaped thin-walled section was dominated by the combined action of the bending moment and warping moment, while there were only a few cracks on the other half of the U-shaped section when the T–M ratio was 1:1; and anti-symmetrical flexural failure was dominated by the warping moment when the T–M ratio was 1:0 (pure torsion). A simple method to calculate the ultimate load of such U-shaped thin-walled RC beams under different T–M ratios was suggested, and the calculating results were corresponding well with the experimental results. reinforced concrete U-shaped thin-walled beam combined action of torsion and flexure warping torsion ultimate load Systems of building construction. Including fireproof construction, concrete construction Shenggang Chen verfasserin aut Quanquan Guo verfasserin aut Yinghua Ye verfasserin aut Bo Diao verfasserin aut Y. L. Mo verfasserin aut In International Journal of Concrete Structures and Materials SpringerOpen, 2013 12(2018), 1, Seite 17 (DE-627)752436694 (DE-600)2724363-1 22341315 nnns volume:12 year:2018 number:1 pages:17 https://doi.org/10.1186/s40069-018-0245-8 kostenfrei https://doaj.org/article/06949f0839fd4d0099eefedeaa3d2bd1 kostenfrei http://link.springer.com/article/10.1186/s40069-018-0245-8 kostenfrei https://doaj.org/toc/1976-0485 Journal toc kostenfrei https://doaj.org/toc/2234-1315 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2027 GBV_ILN_2055 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4392 GBV_ILN_4700 AR 12 2018 1 17
allfieldsGer	10.1186/s40069-018-0245-8 doi (DE-627)DOAJ077700066 (DE-599)DOAJ06949f0839fd4d0099eefedeaa3d2bd1 DE-627 ger DE-627 rakwb eng TH1000-1725 Jianchao Xu verfasserin aut Experimental and Analytical Studies of U-Shaped Thin-Walled RC Beams Under Combined Actions of Torsion, Flexure and Shear 2018 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract U-shaped thin-walled concrete bridge beams usually suffer the combined actions of flexure, shear and torsion, but no research about the behavior of U-shaped thin-walled RC beams under combined actions has been reported in literature. Three large specimens of U-shaped thin-walled RC beams were tested under different torque–bending moment ratios (T–M ratios) of 1:5, 1:1 and 1:0 to investigate the mechanical responses such as crack patterns, reinforcement strains, failure modes and ductility. The testing results showed that ductile flexural failures occurred for all three of the U-shaped thin-walled beam specimens, although the combined shear effect of circulatory torque, warping torque and shear force increased as the T–M ratio increased from 1:5 via 1:1 to 1:0, reflected by diagonal cracks and stirrup strains. More specifically, basically symmetrical flexural failure was dominated by the bending moment when the T–M ratio was 1:5; flexural failure of the loaded half of the U-shaped thin-walled section was dominated by the combined action of the bending moment and warping moment, while there were only a few cracks on the other half of the U-shaped section when the T–M ratio was 1:1; and anti-symmetrical flexural failure was dominated by the warping moment when the T–M ratio was 1:0 (pure torsion). A simple method to calculate the ultimate load of such U-shaped thin-walled RC beams under different T–M ratios was suggested, and the calculating results were corresponding well with the experimental results. reinforced concrete U-shaped thin-walled beam combined action of torsion and flexure warping torsion ultimate load Systems of building construction. Including fireproof construction, concrete construction Shenggang Chen verfasserin aut Quanquan Guo verfasserin aut Yinghua Ye verfasserin aut Bo Diao verfasserin aut Y. L. Mo verfasserin aut In International Journal of Concrete Structures and Materials SpringerOpen, 2013 12(2018), 1, Seite 17 (DE-627)752436694 (DE-600)2724363-1 22341315 nnns volume:12 year:2018 number:1 pages:17 https://doi.org/10.1186/s40069-018-0245-8 kostenfrei https://doaj.org/article/06949f0839fd4d0099eefedeaa3d2bd1 kostenfrei http://link.springer.com/article/10.1186/s40069-018-0245-8 kostenfrei https://doaj.org/toc/1976-0485 Journal toc kostenfrei https://doaj.org/toc/2234-1315 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2027 GBV_ILN_2055 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4392 GBV_ILN_4700 AR 12 2018 1 17
allfieldsSound	10.1186/s40069-018-0245-8 doi (DE-627)DOAJ077700066 (DE-599)DOAJ06949f0839fd4d0099eefedeaa3d2bd1 DE-627 ger DE-627 rakwb eng TH1000-1725 Jianchao Xu verfasserin aut Experimental and Analytical Studies of U-Shaped Thin-Walled RC Beams Under Combined Actions of Torsion, Flexure and Shear 2018 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Abstract U-shaped thin-walled concrete bridge beams usually suffer the combined actions of flexure, shear and torsion, but no research about the behavior of U-shaped thin-walled RC beams under combined actions has been reported in literature. Three large specimens of U-shaped thin-walled RC beams were tested under different torque–bending moment ratios (T–M ratios) of 1:5, 1:1 and 1:0 to investigate the mechanical responses such as crack patterns, reinforcement strains, failure modes and ductility. The testing results showed that ductile flexural failures occurred for all three of the U-shaped thin-walled beam specimens, although the combined shear effect of circulatory torque, warping torque and shear force increased as the T–M ratio increased from 1:5 via 1:1 to 1:0, reflected by diagonal cracks and stirrup strains. More specifically, basically symmetrical flexural failure was dominated by the bending moment when the T–M ratio was 1:5; flexural failure of the loaded half of the U-shaped thin-walled section was dominated by the combined action of the bending moment and warping moment, while there were only a few cracks on the other half of the U-shaped section when the T–M ratio was 1:1; and anti-symmetrical flexural failure was dominated by the warping moment when the T–M ratio was 1:0 (pure torsion). A simple method to calculate the ultimate load of such U-shaped thin-walled RC beams under different T–M ratios was suggested, and the calculating results were corresponding well with the experimental results. reinforced concrete U-shaped thin-walled beam combined action of torsion and flexure warping torsion ultimate load Systems of building construction. Including fireproof construction, concrete construction Shenggang Chen verfasserin aut Quanquan Guo verfasserin aut Yinghua Ye verfasserin aut Bo Diao verfasserin aut Y. L. Mo verfasserin aut In International Journal of Concrete Structures and Materials SpringerOpen, 2013 12(2018), 1, Seite 17 (DE-627)752436694 (DE-600)2724363-1 22341315 nnns volume:12 year:2018 number:1 pages:17 https://doi.org/10.1186/s40069-018-0245-8 kostenfrei https://doaj.org/article/06949f0839fd4d0099eefedeaa3d2bd1 kostenfrei http://link.springer.com/article/10.1186/s40069-018-0245-8 kostenfrei https://doaj.org/toc/1976-0485 Journal toc kostenfrei https://doaj.org/toc/2234-1315 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2027 GBV_ILN_2055 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4392 GBV_ILN_4700 AR 12 2018 1 17
language	English
source	In International Journal of Concrete Structures and Materials 12(2018), 1, Seite 17 volume:12 year:2018 number:1 pages:17
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callnumber-first	T - Technology
author	Jianchao Xu
spellingShingle	Jianchao Xu misc TH1000-1725 misc reinforced concrete misc U-shaped thin-walled beam misc combined action of torsion and flexure misc warping torsion misc ultimate load misc Systems of building construction. Including fireproof construction, concrete construction Experimental and Analytical Studies of U-Shaped Thin-Walled RC Beams Under Combined Actions of Torsion, Flexure and Shear
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topic_title	TH1000-1725 Experimental and Analytical Studies of U-Shaped Thin-Walled RC Beams Under Combined Actions of Torsion, Flexure and Shear reinforced concrete U-shaped thin-walled beam combined action of torsion and flexure warping torsion ultimate load
topic	misc TH1000-1725 misc reinforced concrete misc U-shaped thin-walled beam misc combined action of torsion and flexure misc warping torsion misc ultimate load misc Systems of building construction. Including fireproof construction, concrete construction
topic_unstemmed	misc TH1000-1725 misc reinforced concrete misc U-shaped thin-walled beam misc combined action of torsion and flexure misc warping torsion misc ultimate load misc Systems of building construction. Including fireproof construction, concrete construction
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title	Experimental and Analytical Studies of U-Shaped Thin-Walled RC Beams Under Combined Actions of Torsion, Flexure and Shear
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title_sort	experimental and analytical studies of u-shaped thin-walled rc beams under combined actions of torsion, flexure and shear
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title_auth	Experimental and Analytical Studies of U-Shaped Thin-Walled RC Beams Under Combined Actions of Torsion, Flexure and Shear
abstract	Abstract U-shaped thin-walled concrete bridge beams usually suffer the combined actions of flexure, shear and torsion, but no research about the behavior of U-shaped thin-walled RC beams under combined actions has been reported in literature. Three large specimens of U-shaped thin-walled RC beams were tested under different torque–bending moment ratios (T–M ratios) of 1:5, 1:1 and 1:0 to investigate the mechanical responses such as crack patterns, reinforcement strains, failure modes and ductility. The testing results showed that ductile flexural failures occurred for all three of the U-shaped thin-walled beam specimens, although the combined shear effect of circulatory torque, warping torque and shear force increased as the T–M ratio increased from 1:5 via 1:1 to 1:0, reflected by diagonal cracks and stirrup strains. More specifically, basically symmetrical flexural failure was dominated by the bending moment when the T–M ratio was 1:5; flexural failure of the loaded half of the U-shaped thin-walled section was dominated by the combined action of the bending moment and warping moment, while there were only a few cracks on the other half of the U-shaped section when the T–M ratio was 1:1; and anti-symmetrical flexural failure was dominated by the warping moment when the T–M ratio was 1:0 (pure torsion). A simple method to calculate the ultimate load of such U-shaped thin-walled RC beams under different T–M ratios was suggested, and the calculating results were corresponding well with the experimental results.
abstractGer	Abstract U-shaped thin-walled concrete bridge beams usually suffer the combined actions of flexure, shear and torsion, but no research about the behavior of U-shaped thin-walled RC beams under combined actions has been reported in literature. Three large specimens of U-shaped thin-walled RC beams were tested under different torque–bending moment ratios (T–M ratios) of 1:5, 1:1 and 1:0 to investigate the mechanical responses such as crack patterns, reinforcement strains, failure modes and ductility. The testing results showed that ductile flexural failures occurred for all three of the U-shaped thin-walled beam specimens, although the combined shear effect of circulatory torque, warping torque and shear force increased as the T–M ratio increased from 1:5 via 1:1 to 1:0, reflected by diagonal cracks and stirrup strains. More specifically, basically symmetrical flexural failure was dominated by the bending moment when the T–M ratio was 1:5; flexural failure of the loaded half of the U-shaped thin-walled section was dominated by the combined action of the bending moment and warping moment, while there were only a few cracks on the other half of the U-shaped section when the T–M ratio was 1:1; and anti-symmetrical flexural failure was dominated by the warping moment when the T–M ratio was 1:0 (pure torsion). A simple method to calculate the ultimate load of such U-shaped thin-walled RC beams under different T–M ratios was suggested, and the calculating results were corresponding well with the experimental results.
abstract_unstemmed	Abstract U-shaped thin-walled concrete bridge beams usually suffer the combined actions of flexure, shear and torsion, but no research about the behavior of U-shaped thin-walled RC beams under combined actions has been reported in literature. Three large specimens of U-shaped thin-walled RC beams were tested under different torque–bending moment ratios (T–M ratios) of 1:5, 1:1 and 1:0 to investigate the mechanical responses such as crack patterns, reinforcement strains, failure modes and ductility. The testing results showed that ductile flexural failures occurred for all three of the U-shaped thin-walled beam specimens, although the combined shear effect of circulatory torque, warping torque and shear force increased as the T–M ratio increased from 1:5 via 1:1 to 1:0, reflected by diagonal cracks and stirrup strains. More specifically, basically symmetrical flexural failure was dominated by the bending moment when the T–M ratio was 1:5; flexural failure of the loaded half of the U-shaped thin-walled section was dominated by the combined action of the bending moment and warping moment, while there were only a few cracks on the other half of the U-shaped section when the T–M ratio was 1:1; and anti-symmetrical flexural failure was dominated by the warping moment when the T–M ratio was 1:0 (pure torsion). A simple method to calculate the ultimate load of such U-shaped thin-walled RC beams under different T–M ratios was suggested, and the calculating results were corresponding well with the experimental results.
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title_short	Experimental and Analytical Studies of U-Shaped Thin-Walled RC Beams Under Combined Actions of Torsion, Flexure and Shear
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Three large specimens of U-shaped thin-walled RC beams were tested under different torque–bending moment ratios (T–M ratios) of 1:5, 1:1 and 1:0 to investigate the mechanical responses such as crack patterns, reinforcement strains, failure modes and ductility. The testing results showed that ductile flexural failures occurred for all three of the U-shaped thin-walled beam specimens, although the combined shear effect of circulatory torque, warping torque and shear force increased as the T–M ratio increased from 1:5 via 1:1 to 1:0, reflected by diagonal cracks and stirrup strains. More specifically, basically symmetrical flexural failure was dominated by the bending moment when the T–M ratio was 1:5; flexural failure of the loaded half of the U-shaped thin-walled section was dominated by the combined action of the bending moment and warping moment, while there were only a few cracks on the other half of the U-shaped section when the T–M ratio was 1:1; and anti-symmetrical flexural failure was dominated by the warping moment when the T–M ratio was 1:0 (pure torsion). A simple method to calculate the ultimate load of such U-shaped thin-walled RC beams under different T–M ratios was suggested, and the calculating results were corresponding well with the experimental results.</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">reinforced concrete</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">U-shaped thin-walled beam</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">combined action of torsion and flexure</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">warping torsion</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">ultimate load</subfield></datafield><datafield tag="653" ind1=" " ind2="0"><subfield code="a">Systems of building construction. Including fireproof construction, concrete construction</subfield></datafield><datafield tag="700" ind1="0" ind2=" "><subfield code="a">Shenggang Chen</subfield><subfield code="e">verfasserin</subfield><subfield code="4">aut</subfield></datafield><datafield tag="700" ind1="0" ind2=" "><subfield code="a">Quanquan Guo</subfield><subfield code="e">verfasserin</subfield><subfield code="4">aut</subfield></datafield><datafield tag="700" ind1="0" ind2=" "><subfield code="a">Yinghua Ye</subfield><subfield code="e">verfasserin</subfield><subfield code="4">aut</subfield></datafield><datafield tag="700" ind1="0" ind2=" "><subfield code="a">Bo Diao</subfield><subfield code="e">verfasserin</subfield><subfield code="4">aut</subfield></datafield><datafield tag="700" ind1="0" ind2=" "><subfield code="a">Y. L. 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Experimental and Analytical Studies of U-Shaped Thin-Walled RC Beams Under Combined Actions of Torsion, Flexure and Shear

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