scholarly journals Toward virtual design and optimization of a structural test monitored by a multi-view system

2020 ◽  
pp. 030932472091088 ◽  
Author(s):  
Matthieu Vitse ◽  
Martin Poncelet ◽  
Alaa Eddin Iskef ◽  
John-Eric Dufour ◽  
Renaud Gras ◽  
...  
Keyword(s):  
Concrete Beam ◽  
A Priori ◽  
Three Dimensional ◽  
Reinforced Concrete Beam ◽  
Digital Cameras ◽  
Virtual Design ◽  
Realistic Rendering ◽  
Design And Optimization ◽  
Structural Test ◽  
Column Joint

In order to characterize the mechanical behavior of a reinforced concrete beam–column joint, an experiment is designed whereby different histories of increasing cyclic loads are applied, and the structure deformation (as well as the morphology of apparent surface cracks) is studied using multi-view correlation. The complex three-dimensional geometry and the slender nature of the beam and column call for numerous digital cameras were positioned around the specimen. Assessing the feasibility of image acquisition and estimating a priori uncertainties on multi-view correlation became a true challenge. It is shown that the recourse to photo-realistic rendering software provides the needed tools to perform this experiment design optimization.

Deformation Characteristics of Reinforced Concrete Beam-Column Joint Cores under Earthquake Loading

2003 ◽  
Vol 6 (1) ◽  
pp. 15-21 ◽  
Author(s):  
Sayed A. Attaalla ◽  
Mehran Agbabian
Keyword(s):  
Reinforced Concrete ◽  
Shear Deformation ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Frame ◽  
Bond Failure ◽  
Strain Compatibility ◽  
Concrete Frame ◽  
Column Joint ◽  
Reinforced Concrete Frame Structures

The characteristics of the shear deformation inside the beam-column joint core of reinforced concrete frame structures subjected to seismic loading are discussed in this paper. The paper presents the formulation of an analytical model based on experimental observations. The model is intended to predict the expansions of beam-column joint core in the horizontal and vertical directions. The model describes the strain compatibility inside the joint in an average sense. Its predictions are verified utilizing experimental measurements obtained from tests conducted on beam-column connections. The model is found to adequately predict the components of shear deformation in the joint core and satisfactorily estimates the average strains in the joint hoops up to bond failure. The model may be considered as a simple, yet, important step towards analytical understanding of the sophisticated shear mechanism inside the joint and may be implemented in a controlled-deformation design technique of the joint.

scholarly journals Comparative Study of Three-Dimensional Stress and Crack Imaging in Concrete by Application of Inverse Algorithms to Coda Wave Measurements

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4899
Author(s):  
Hanwan Jiang ◽  
Hanyu Zhan ◽  
Ziwei Ma ◽  
Ruinian Jiang
Keyword(s):  
Concrete Beam ◽  
Three Dimensional ◽  
Real Life ◽  
Reinforced Concrete Beam ◽  
Great Sensitivity ◽  
Coda Wave ◽  
Wave Measurements ◽  
Stress Changes ◽  
Real Life Situation ◽  
Load Tests

The intrinsic heterogeneity property of concrete causes strong multiple scatterings during wave propagation, forming coda wave that follows very complex trajectories. As a superposition of multiply scattered waves, coda wave shows great sensitivity to subtle changes, but meanwhile lose spatial resolution. To make use of its sensitivity and turn the limitation into advantage, this paper presents an experimental study of three-dimensionally imaging local changes in concrete by application of inverse algorithms to coda wave measurements. Load tests are performed on a large reinforced concrete beam that contains multiple pre-existing millimeter-scale cracks in order to match real life situation. The joint effects of cracks and stresses on coda waves have been monitored using a network of fixed transducers placed at the surface. The global waveform decorrelations and velocity variations are firstly quantified through coda wave interferometry technique. Subsequently, two inverse algorithms are independently applied to map the densities of changes at each localized position. Using this methodology, the stress changes and subtle cracks in the concrete beam are detected and imaged for both temporal and spatial domains.

Seismic performance of reinforced concrete beam–column joint strengthening by frp sheets

Structures ◽  
2019 ◽  
Vol 20 ◽  
pp. 353-364 ◽  
Author(s):  
Nassereddine Attari ◽  
Youcef Si Youcef ◽  
Sofiane Amziane
Keyword(s):  
Reinforced Concrete ◽  
Seismic Performance ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Column Joint

scholarly journals Cyclic behavior of ultra-high performance fiber reinforced concrete beam-column joint

2018 ◽  
Vol 20 (1) ◽  
pp. 348-360 ◽  
Author(s):  
Patricia A. Sarmiento ◽  
Benjamín Torres ◽  
Daniel M. Ruiz ◽  
Yezid A. Alvarado ◽  
Isabel Gasch ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Fiber Reinforced Concrete ◽  
Cyclic Behavior ◽  
Fiber Reinforced ◽  
High Performance Fiber ◽  
Column Joint

Modeling bond-slip deformations in reinforced concrete beam-column joints

2000 ◽  
Vol 27 (3) ◽  
pp. 490-505 ◽  
Author(s):  
Mostafa Elmorsi ◽  
M Reza Kianoush ◽  
W K Tso
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Concrete Beam ◽  
Element Model ◽  
Reinforced Concrete Beam ◽  
Experimental Results ◽  
Reinforcing Bars ◽  
Bond Slip ◽  
Joint Element ◽  
Column Joint

A new finite element model for reinforced concrete beam-column joints is proposed. The model considers the effects of bond-slip and shear deformations in the joint panel region. The problems associated with modeling bond-slip of anchored reinforcing bars are discussed. The proposed bond-slip model is examined at the element level by comparing its predictions with other analytical and experimental results. The ability of the model to simulate bond deterioration and eventual pullout of anchored reinforcing bars under severe cyclic excitation is demonstrated. This model is incorporated into the global beam-column joint element. Further comparisons are made between the predictions of the proposed beam-column joint model and other analytical and experimental results under reversed cyclic loading to show the validity of the model to describe the bond-slip behavior of the joints.Key words: bond, bond-slip, finite element, beam-column, reinforced concrete, cyclic.

scholarly journals Cracking Propagation and Pattern Behaviour of Irregular-Shaped Polyethylene Terephthalate Fibre Reinforced Concrete Beam

2015 ◽  
Vol 773-774 ◽  
pp. 911-915 ◽  
Author(s):  
J.M. Irwan ◽  
R.M. Asyraf ◽  
N. Othman ◽  
H.B. Koh ◽  
A.K. Aeslina ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Polyethylene Terephthalate ◽  
Concrete Beam ◽  
Volume Fraction ◽  
Reinforced Concrete Beam ◽  
Rc Beam ◽  
Materials Properties ◽  
Tensile Strength Test ◽  
Structural Test ◽  
Polyethylene Terephthalate Fibre

This paper reports the results on cracking propagation and pattern of reinforced concrete (RC) beam conducted using irregular-shaped Polyethylene Terephthalate (IPET) as a fibre. Three volume fraction of IPET fibre is used namely, 0.5%, 1% and 1.5%. All RC beam specimens are tested under four point loading under flexural capacity behaviour. Prior to structural test, the materials properties which include the compressive and tensile strength test and modulus of elasticity test were determined. The results than are compared with control RC beam. It is found that the RC beam with IPET fibre does not significantly change the behaviour of failure mode, cracking propagation and pattern compared to control RC beam.

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