scholarly journals Finite element modelling of monotonic pull-out test of deformed steel rebar embedded in well-confined concrete

2021 ◽  
Vol 331 ◽  
pp. 05012
Author(s):  
Patria Kusumaningrum ◽  
Gigih Muslim Prayogo ◽  
Sri Tudjono
Keyword(s):  
Finite Element ◽  
Finite Element Modelling ◽  
Empirical Equation ◽  
Bond Stress ◽  
Confined Concrete ◽  
Bond Slip ◽  
Steel Rebar ◽  
Bond Model ◽  
Pull Out ◽  
Good Agreement

A finite element study carried out using LS DYNA and aimed to simulate the monotonic pull-out test of deformed steel rebar embedded in concrete is presented in this paper. Three models of the interface between deformed steel rebar and well-confined concrete, i.e. perfect bond model and two bond-slip models are observed and compared. Bond stress-slip response and rebar stress-slip response obtained numerically are validated with experimental data and empirical equations available from the literature. The full bond model overestimates the response, providing higher rebar stress. In the bond-slip models, good agreement is observed between numerical and experimental bond stress and rebar Stress–slip responses. The empirical equation of bond-slip proposed by Murcia-Delso and Shing (2014) is found to overestimate the peak bond stress.

Bond Properties of Plain Steel Bar in Concrete with Machine-Made Sand

2013 ◽  
Vol 438-439 ◽  
pp. 20-24
Author(s):  
Feng Lan Li ◽  
Ke Fei Yu ◽  
Xin Xin Ding ◽  
Chang Ming Li
Keyword(s):  
Bond Strength ◽  
Experimental Studies ◽  
Bond Stress ◽  
Test Method ◽  
Bond Properties ◽  
Bond Slip ◽  
Ordinary Concrete ◽  
Strength Grade ◽  
Pull Out ◽  
Steel Bar

To meet the requirement of machine-made sand application in concrete structures, it is necessary to understand the bond properties of steel bar with machine-made sand concrete (MSC). Therefore, the experimental studies were carried out on the bond of plain steel bar with MSC by the central pull-out test method. Three specimens were cast as one group, 6 groups were tested considering the changes of strength grade of MSC and ordinary concrete. The bond-slip curves were measured and analyzed. The results show that the bond slip begins at the tensile side and transfers gradually to the free end before the entire slip turns up along the interface of plain steel bar and surrounded concrete, the largest average bond stress, i. e. the bond strength of plain steel bar corresponds to the initial entire slip of plain steel bar. With the increasing strength grade of MSC and ordinary concrete, the difference of slip at tensile side and free end becomes greater. Comparing that only appears in ordinary concrete with higher strength, the larger slips turn up while the bond stress reaches the largest for the plain steel bar in MSC. Larger scatter of bond strength is between specimens in the same group. Some plain steel bars yields with the beginning of entire slip along the interface.

scholarly journals Experimental and Numerical Investigation of Bond-Slip Behavior of High-Strength Reinforced Concrete at Service Load

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 293
Author(s):  
Alinda Dey ◽  
Domas Valiukas ◽  
Ronaldas Jakubovskis ◽  
Aleksandr Sokolov ◽  
Gintaris Kaklauskas
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Numerical Investigation ◽  
Load Level ◽  
Scale Model ◽  
Element Analysis ◽  
Bond Slip ◽  
Pull Out ◽  
Bond Mechanism ◽  
Concrete Interface

A bond mechanism at the reinforcement-concrete interface is one of the key sources of the comprehensive functioning of reinforced concrete (RC) structures. In order to apprehend the bond mechanism, the study on bond stress and slip relation (henceforth referred as bond-slip) is necessary. On this subject, experimental and numerical investigations were performed on short RC tensile specimens. A double pull-out test with pre-installed electrical strain gauge sensors inside the modified embedded rebar was performed in the experimental part. Numerically, a three dimensional rib scale model was designed and finite element analysis was performed. The compatibility and reliability of the numerical model was verified by comparing its strain result with an experimentally obtained one. Afterwards, based on stress transfer approach, the bond-slip relations were calculated from the extracted strain results. The maximum disparity between experimental and numerical investigation was found as 19.5% in case of strain data and 7% for the bond-slip relation at the highest load level (110 kN). Moreover, the bond-slip curves at different load levels were compared with the bond-slip model established in CEB-fib Model Code 2010 (MC2010). Overall, in the present study, strain monitoring through the experimental tool and finite element modelling have accomplished a broader picture of the bond mechanism at the reinforcement-concrete interface through their bond-slip relationship.

Finite-element modelling of two-disc shrink fit assembly and an evaluation of material pairs of discs

2010 ◽  
Vol 225 (2) ◽  
pp. 263-273 ◽  
Author(s):  
F Ozturk
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Finite Element Modelling ◽  
The Finite Element Method ◽  
Uniform Stress ◽  
Element Modelling ◽  
Hollow Shaft ◽  
Complex Shapes ◽  
Shrink Fit ◽  
Good Agreement

In this study, a two-disc shrink fit assembly was modelled in two dimension using ABAQUS/Standard to determine the interfacial pressures with respect to the interferences. Steel—steel and steel—aluminium material pairs were considered. Inner disc of the assembly was considered as hollow and solid shafts, respectively. The results indicate that the finite-element results were in good agreement with the analytical results. In the hollow shaft assembly, both the hollow shaft and the outer disc had non-uniform stress distribution. In the solid shaft assembly, uniform stress distribution for the solid shaft and non-uniform stress distribution for the outer disc were determined. It was pointed out that same pressure can be obtained by different interference with different material pairs. If the assembly has complex shapes, the finite-element method gives more comprehensive and accurate results than the analytical method.

Finite Element Analysis of the Pull-Out Specimens of Steel Reinforced Lightweight Concrete

2012 ◽  
Vol 166-169 ◽  
pp. 514-519
Author(s):  
Jian Wen Zhang ◽  
Shi Hui Guo
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Lightweight Concrete ◽  
Constitutive Relationship ◽  
Test Results ◽  
Concrete Element ◽  
Element Analysis ◽  
Bond Slip ◽  
Spring Element ◽  
Pull Out

Finite element analysis method of steel reinforced lightweight concrete pull-out specimens is exploded based on the test results. Spring element and local bond slip constitutive relation are introduced in analysis so as to consider the interfacial bond-slip between steel and lightweight concrete. Element tributary area and flange or web position should be taken into account in order to confirm the spring element real constant. Analysis results indicate that specimens bearing capacity and deformation can be well simulated adopting the stated method and constitutive relationship.

scholarly journals Determination of bond model for 7-wire strands in pretensioned concrete beam

2021 ◽  
Vol 61 (6) ◽  
pp. 740-748
Author(s):  
Vadzim Parkhats ◽  
Rafał Krzywoń ◽  
Jacek Hulimka ◽  
Jan Kubica
Keyword(s):  
Finite Element ◽  
Strain Distribution ◽  
Concrete Beam ◽  
Bond Stress ◽  
Image Correlation ◽  
Finite Element Models ◽  
Bond Model ◽  
Comparison Results ◽  
Pretensioned Concrete

A correct choice of a bond model for prestressing tendons is crucial for the right modelling of a structural behaviour of a pretensioned concrete structure. The aim of this paper is the determination of an optimal bond model for 7-wire strands in a prestressed concrete beam produced in a precast concrete plant of Consolis Poland. ATENA 3D is used to develop finite element models of the beam that differ only in a bond stress-slip relationship of tendons. The bond stress-slip relationships for modelling are taken from the results of bond tests carried out by different researchers in previous years. Moreover, for comparison purposes, a simplified 2D model of the beam is created in Autodesk Robot. The strain distribution at the time of the strand release is found for each of the finite element models. The determined strain distributions are compared with the strain distribution in the beam established by an experimental test using a measuring system based on a digital image correlation. On the basis of the comparison results, the most appropriate bond models for 7-wire strands used in the beam are identified.

scholarly journals An experimental study of damage characteristics at bond of RC after microwave heating

2021 ◽  
Vol 73 (02) ◽  
pp. 107-117
Keyword(s):  
Thermal Damage ◽  
Interfacial Bond ◽  
Bond Slip ◽  
Damage Characteristics ◽  
Steel Rebar ◽  
Pull Out ◽  
Irradiation Power ◽  
Splitting Failure ◽  
Microwave Irradiations ◽  
Characteristic Points

With an increase in urban construction waste, and in order to find an effective method of microwave-assisted mechanical RC regeneration, thermal damage characteristics of the interfacial bond between steel rebar and concrete after different microwave irradiations are analysed in this paper. The results show that, with an increase in microwave power, the overall failure mode of the specimen changes from splitting failure to pull-out failure. Bond slip curves and the corresponding fitting equations were obtained at various levels of microwave irradiation. By analysing characteristic points of the curve, 3500W was determined as a reasonable irradiation power.

Bond-Slip Numerical Simulation of Concrete and Gypsum Board

2011 ◽  
Vol 255-260 ◽  
pp. 3133-3136
Author(s):  
Quan Bin Zhao ◽  
Xin Liang Jiang
Keyword(s):  
Numerical Simulation ◽  
Constitutive Relation ◽  
Simulation Analysis ◽  
Experimental Results ◽  
Gypsum Board ◽  
Bond Slip ◽  
Pull Out ◽  
Simulation Results ◽  
Research Situation ◽  
Good Agreement

The characteristics and research situation of bond-slip performance at the inter face of concrete and other materials are introduced, and the bond-slip constitutive relation models are summarized at the same time. Through the load-slip curves obtained from the pull-out experiment of CFFP, the proposed bond-slip constitutive relation models are presenting, including the simple one. With the numerical simulation analysis of CFFP is carried out by the use of the proposed constitutive relation, while the numerical simulation results are in good agreement with the experimental results conducted before, which is feasible and can be applied to further research on CFFP.

Analysis of bond-slip and transverse dissipative energies in confined reinforcing bars

2018 ◽  
Vol 45 (9) ◽  
pp. 739-751
Author(s):  
Armin Erfanian ◽  
Alaa E. Elwi
Keyword(s):  
Finite Element ◽  
Large Deformations ◽  
Confined Concrete ◽  
Test Results ◽  
Reinforcing Bars ◽  
Bond Slip ◽  
Finite Element Approach ◽  
Transverse Pressure ◽  
Element Approach ◽  
Plastic Stage

A finite element approach for the analysis of straight and bent reinforcing bars in confined concrete under monotonic loading is presented. This type of anchorage is mostly found in joints. Bond and transverse dissipative energies are included. The proposed approach predicts the capacity, bond, slip, strains, and stresses along the bars in curved and straight configurations. This method can be used to predict bar pullout behavior. Various bond-slip models and test results are available in the literature. Many of the current approaches do not consider the plastic stage bond, transverse pressure, and large deformations. These shortcomings are resolved in this research. A simplified but effective approach is proposed for plastic stage bond. Internal and external transverse pressures are addressed presenting a mathematically sound incremental procedure. These solutions are appended to the existing nonlinear strategies to accommodate large deformations. Comparison with published experimental results demonstrates the accuracy of the proposed method.

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