ANSYS MODELLING BEHAVIOUR OF THE REINFORCED CONCRETE BEAM WITH THE EFFECT OF VARIOUS REINFORCEMENT TYPE AND CONCRETE STRENGTH (Darmansyah Tjitradi, Eliatun, Syahril Taufik, Mariamah) (original) (raw)
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Effect of flexural crack on plain concrete beam failure mechanism A numerical .PDF
The flexural failure of plain concrete beam occurs along with development of flexural crack on beam. In this paper by using ABAQUS, mechanism failure of plain concrete beam under three steps have been simulated. The cracking moment has been analytically calculated and applied on the both sides of the fixed beam, and flexural crack has been simulated on beam. Displacement, von Mises, load reaction, displacementcrack length, von Mises-crack length and von Mises-displacement of beams have been graphical depicted. Results indicated that, the flexural crack governs beam mechanism failure and its effects on beam resistance failure. It has been found that the flexural crack in initial stage it developed slowly and changes to be fast at the final stage of collapsing beam due to reduction of the flexural resistance of beam. Increasing mechanical properties of concrete, collapse displacement is reduced.
A Study on Toughness Contribution to Structural Capacity of Reinforced Concrete Beam
IntechOpen eBooks, 2023
The term of toughness is one of the fracture parameters which describes the ability of structures to remain deformed while collapsing. Toughness can be expressed as both, strain energy release rate G or as stress intensity factor K. This study deals with how reinforcement influences toughness K to divert rapid to gradual failure. Wedge forces developed by cohesiveness between rebars and concrete are the main concern in transforming elastic to plastic behavior by means reducing the value of stress intensity factor K. Three-point bend beam as a specimen with mode I fracture of (150 Â 300) mm dimension with 100 mm initial crack was conducted in the analytical processing. The specimen was reinforced by 4#12mm steel bars. Wedge forces 'p' due to reinforcement tensile T developed by composite action between concrete and reinforcement prevailed K P I ¼ 441:613 Nmm À1:5 whereas stress intensity factor due to load for beam without reinforcement K P I ¼ 482:7Nmm À1:5. Hence, the stress intensity factor due to the contribution of reinforcement K R I ¼ 41:087 Nmm À1:5 which is greater than the critical toughness K Ic =22:136 Nmm À1:5. By applying the term strain energy release rate G in conjunction with stress intensity factor K through the relationship K ¼ ffiffiffiffiffiffi ffi EG p , resulting in G is close to 35 N/m, a value under which normal plain concrete would fail.
Effect of flexural crack on plain concrete beam failure mechanism A numerical simulation
Frattura ed Integrità Strutturale, 2016
The flexural failure of plain concrete beam occurs along with development of flexural crack on beam. In this paper by using ABAQUS, mechanism failure of plain concrete beam under three steps have been simulated. The cracking moment has been analytically calculated and applied on the both sides of the fixed beam, and flexural crack has been simulated on beam. Displacement, von Mises, load reaction, displacementcrack length, von Mises-crack length and von Mises-displacement of beams have been graphical depicted. Results indicated that, the flexural crack governs beam mechanism failure and its effects on beam resistance failure. It has been found that the flexural crack in initial stage it developed slowly and changes to be fast at the final stage of collapsing beam due to reduction of the flexural resistance of beam. Increasing mechanical properties of concrete, collapse displacement is reduced.
MODELLING AND ANALYSIS OF REINFORCED CONCRETE BEAM UNDER FLEXURE USING ANSYS
Understanding the behaviour of structural components like beam, column and wall during loading is crucial for the development of efficient and safe structures. In this article, the reinforced concrete beam has been modelled and analysed when subjected to two point loads at one third span from each support, using Finite Element Analysis tool, popularly called ANSYS software. The modelled and analysed beam having size 600 mm × 160 mm × 160 mm with 3 numbers of 12 mm diameter bars as main reinforcement, 2 numbers of 8 mm diameter as hanger bars and 8 mm diameter at 100 mm c/c as shear reinforcement. The behaviour of the analysed beam has been observed in terms of the flexural behaviour, crack pattern and displacement for various loading conditions such as 50 kN, 150kN, 250kN, 350kN, 450kN and failure load (690kN).Based on the analysis carried out on the RC beams using ANSYS, it is found that results are more sensitive to mesh size, materials properties, load increments, etc.
HBRC Journal, 2012
Design of any structural element should realize the appropriate load capacity to serve the purpose of construction beside the esthetical function. Therefore, the accompanied symptoms of distress during loading conditions like cracking, deflections, and strain distribution all over the section will definitely influence the performance of these elements and their durability in sequence. Flexural moment is the most dominant straining action in many of the reinforced concrete elements such as beams, slabs, and frames. Thus, in this investigation an experimental program was carried out on deficient concrete beams which were somewhat designated to simulate the possible defects in the field, like errors in the arrangement of main steel, splices in different places (even at the maximum moment zone). Faults of improper workmanship were represented using a beam of honeycombed concrete and other of insufficient cover. On the other hand, a control beam was parallely cast for the purpose of comparison. Measurements like strains of concrete and steel, deflections and propagation of cracks were all observed and detected to evaluate to how any of these practice faults influence the behavior of beams. It was found that well-arranged distribution of reinforcement improves the ductile behavior of failure and reduces the corresponding deflections. Meanwhile, eccentricity of main steel creates a sort of non-uniform stress distribution over the section and accelerates approaching failure stage. In addition, the honey-combed structure undergoes more symptoms of distress and approaches failure faster without intermediate stage. Despite the fewer grids of cracks noticed, the honey-combed beam exhibits higher deflection values.
Failure mode of truss system concrete beams strengthened with tensile reinforcement
IOP Conference Series: Earth and Environmental Science
Cracks usually precede beams failures. Cracks occurred due to the applied load exceeds the capacity of the cross-section in carrying the load. The use of a diagonal reinforcement or truss system can increase the flexural capacity of the beams. The previous research of using truss system reinforcement in the beam without concrete in the tension zone causes a decrease in flexural capacity due to the cracks in the area near the support. Therefore, it is necessary to add tensile reinforcement in the zone. This study uses a truss reinforced concrete beam specimen with dimensions of 15 cm x 20 m x 330 cm. There are four variations of the specimens, namely Normal Beams (BN) as control beam, BTRP 40D, BTRP 60D, and BTRP 80D. The flexural test is carried out by monotonic static loading. The results showed that the flexural capacity of BTRP 40D, BTRP 60D, and BTRP 80D increased due to the addition of tensile reinforcement in the support zone. Moreover, the failure mode of BTRP 60D and BTRP 80...
Modeling the Flexural Performance of Reinforced Concrete Built-up Beams
IOP Conference Series: Materials Science and Engineering, 2020
Finite element modeling is used for tracking the flexural response of built-up reinforced concrete beams under the influence of dominant flexural loading. ABAQUS finite element analysis program was used toward this goal, due to its superior capability to represent the mechanical properties of concrete including compressive and tensile strength in strain hardening and softening behaviors; and the features related to steel reinforcement rebar. This study is based on the comparison between the theoretical analysis by the finite element method and the experimental results. The experimental program consists of casting and testing six rectangular cross-sections of simply supported reinforced concrete beams. Two beams are cast as a reference which fully Conventional Concrete (CC) and Reactive Powder Concrete (RPC), the rest four were built-up beams made by the combination of two types of concrete in one element. The study deals with, the load which caused a first crack, ultimate carrying c...
Engineering Failure Analysis, 2014
For many years, high-strength concrete (HSC) has been used in high-rise buildings and bridges. The primary reasons for selecting HSC are to produce a more economical product, provide a feasible technical solution, or a combination of both. Despite a lot of advantages in the usage of HSC, it exhibits a brittle failure in comparison with normal strength concrete (NSC). For a comprehensive discussion on the failure of HSC beams, a total of six full scale reinforced HSC beams have been designed based on ACI code provisions and cast with compressive strength in the range of 65 MPa 6 f 0 c 6 75 MPa and tested under two-point top loading. The general behaviour of tested beams has been investigated with observation on mid span deflection, failure mode and crack growth. Increase of the tensile reinforcement ratio results in more cracks but with lower height and width. The linear graphs between the applied load and corresponding deflection or curvature in reinforced HSC beams showed that the behaviour of these beams is elastic and any increase in the tensile reinforcement ratio results in an increase in the ultimate load too. The moment-curvature graph and load-deflection curve started with an initial elastic response followed by an inelastic behaviour that appears with a gradual decrease in stiffness till the ultimate moment is reached.
4th International Conference on Advances in Civil Engineering, 2018
The use of high strength concrete has become popular in construction work because of its improved strength and durability. High-strength concrete can be used as a substituting material over conventional concrete for structural members. This study describes the flexural behaviour of high strength reinforced concrete beam. The variation of flexural ductility with concrete compressive strength is quite complicated and thus sincerely reviewed in this paper. An experimental and numerical investigation of high strength reinforced concrete beam has been conducted in the present study. Four simply supported beams, having compressive strength of 27.50 MPa, 43.85 MPa, 54.05 MPa and 62.01 MPa, reinforced in top and bottom edges of the beam have been investigated in this study. The beams were tested under two-point loading to reveal their flexural behaviour. Load-deflection diagram and ductility index are the primary parameters that were considered in this study. The ultimate loads that obtained from the experimental results were found to be in good agreement with the numerical results. In addition, this study also compared the theoretical and experimental deflection at the mid-point of the beam. The cracking behaviour of all the beams and the crack width is also reviewed in this paper.
The effect of concrete strength and reinforcement on toughness of reinforced concrete beams
Abstract The objective pursued with this work includes the evaluating of the strength and the total energy absorption capacity (toughness) of reinforced concrete beams using different amounts of steel-bar reinforcement. The experimental campaign deals with the evaluation of the threshold load prior collapse, ultimate load and deformation, as well as the beam total energy absorption capacity, using a three point bending test. The beam half span displacement was measured using a displacement transducer, and the applied force was monitored using a load cell. The tested samples consists on a set of ten reinforced concrete beams having three different levels of steel-bar-reinforcement percentages and four different concrete compositions (i.e., giving rise to a different values of concrete strength). It was observed that the most influential parameter in the beams energy absorption capacity is the amount of steel-bar reinforcement. The results have presented good agreement between themselves. In fact, for beams with a given concrete compressive strength, a decrease in beam’s deformation was measured for higher steel-bar-reinforcement percentages. Moreover, the results had shown that for a particular steel-bar-reinforcement percentage, the concrete compressive strength have also influence in the total energy absorption capacity of the beams.