Influence of the plastic hinge rotations on shear strength in continuous reinforced concrete beams with shear reinforcement

•Development of an innovative tests system with statically indeterminate structures.•Digital Image Correlation techniques used to measure bending rotation.•Crack rotation detected by a different rotation of bodies over and below the CSC.•Concrete shear strength decreases with bending rotation and cr...

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Veröffentlicht in:Engineering structures 2020-03, Vol.207, p.110242, Article 110242
Hauptverfasser: Monserrat López, Andrea, Miguel Sosa, Pedro Fco, Bonet Senach, José Luis, Fernández Prada, Miguel Ángel
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container_start_page 110242
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creator Monserrat López, Andrea
Miguel Sosa, Pedro Fco
Bonet Senach, José Luis
Fernández Prada, Miguel Ángel
description •Development of an innovative tests system with statically indeterminate structures.•Digital Image Correlation techniques used to measure bending rotation.•Crack rotation detected by a different rotation of bodies over and below the CSC.•Concrete shear strength decreases with bending rotation and crack width.•Codes do not properly capture the shear strength reduction due to bending rotation. Continuous reinforced concrete (RC) beams may develop significant plastic rotations to enable the redistribution of bending moments. These rotations occur at plastic hinges, which are subject to high shear forces. The influence of rotations on the shear strength for statically determined beams without shear reinforcement failing in shear after yielding of the flexural reinforcement has already been experimentally verified. However, this influence has not been studied in continuous members with shear reinforcement. An innovative tests system has been specially designed to develop shear failures before and after yielding of the flexural reinforcement in both statically determinate and indeterminate structures. Nine beams (9000 mm long, 250 mm wide, 450 mm high) with a shear reinforcement of ϕ8/30 (ρw = 0.13%) and different longitudinal reinforcement ratios were tested under different load and support conditions. The shear strength provided by shear reinforcement and that provided by the other mechanisms of resistance (shear strength provided by concrete) for each specimen were calculated based on the critical shear crack width measurements performed by Digital Image Correlation (DIC). Bending rotation and crack rotation along the development length of the critical shear crack were also obtained by DIC. Based on the test results, the shear strength provided by concrete was studied in relation to the bending rotation and the average crack width in reinforced concrete beams with shear reinforcement. It was confirmed that the shear strength provided by concrete decreased with increasing both bending rotations and crack widths. The shear strength values predicted by different design codes (ACI 318-19, Eurocode 2 and Model Code 2010) were compared with the test results, and showed that these formulations did not properly capture the loss of shear strength caused by bending rotation.
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Continuous reinforced concrete (RC) beams may develop significant plastic rotations to enable the redistribution of bending moments. These rotations occur at plastic hinges, which are subject to high shear forces. The influence of rotations on the shear strength for statically determined beams without shear reinforcement failing in shear after yielding of the flexural reinforcement has already been experimentally verified. However, this influence has not been studied in continuous members with shear reinforcement. An innovative tests system has been specially designed to develop shear failures before and after yielding of the flexural reinforcement in both statically determinate and indeterminate structures. Nine beams (9000 mm long, 250 mm wide, 450 mm high) with a shear reinforcement of ϕ8/30 (ρw = 0.13%) and different longitudinal reinforcement ratios were tested under different load and support conditions. The shear strength provided by shear reinforcement and that provided by the other mechanisms of resistance (shear strength provided by concrete) for each specimen were calculated based on the critical shear crack width measurements performed by Digital Image Correlation (DIC). Bending rotation and crack rotation along the development length of the critical shear crack were also obtained by DIC. Based on the test results, the shear strength provided by concrete was studied in relation to the bending rotation and the average crack width in reinforced concrete beams with shear reinforcement. It was confirmed that the shear strength provided by concrete decreased with increasing both bending rotations and crack widths. 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Continuous reinforced concrete (RC) beams may develop significant plastic rotations to enable the redistribution of bending moments. These rotations occur at plastic hinges, which are subject to high shear forces. The influence of rotations on the shear strength for statically determined beams without shear reinforcement failing in shear after yielding of the flexural reinforcement has already been experimentally verified. However, this influence has not been studied in continuous members with shear reinforcement. An innovative tests system has been specially designed to develop shear failures before and after yielding of the flexural reinforcement in both statically determinate and indeterminate structures. Nine beams (9000 mm long, 250 mm wide, 450 mm high) with a shear reinforcement of ϕ8/30 (ρw = 0.13%) and different longitudinal reinforcement ratios were tested under different load and support conditions. 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source Elsevier ScienceDirect Journals
subjects Beams (structural)
Bend strength
Bending moments
Building codes
Concrete
Concrete structures
Continuous beam
Correlation analysis
Digital imaging
Plastic hinge
Plastic properties
Plasticity
Reinforced concrete
Reinforcement
Rotation
Shear forces
Shear reinforcement
Shear strength
Shear test
title Influence of the plastic hinge rotations on shear strength in continuous reinforced concrete beams with shear reinforcement
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