The effect of traditional reinforcement - prestressed reinforcement ratio on the behaviour of concrete beams (original) (raw)
Related papers
Analytical Investigations on Reinforced Concrete Beams
2018
1Associate Professor, Dept. of Civil Engineering, Basaveshwar Engg. College, Bagalkot, Karnataka, India 2Research Scholar, Dept. of Civil Engineering, Basaveshwar Engg. College, Bagalkot, Karnataka, India ----------------------------------------------------------------------***--------------------------------------------------------------------Abstract Structural analysis is used to assess the behavior of engineering structures under the application of various loads. Commonly used structural analysis methods include analytical methods, experimental methods and numerical methods. Analytical methods provide accurate solutions with applications limited to simple geometrics. Experimental methods are used to test prototypes or full scale models. There are various finite element software packages such as ATENA, ABAQUS, Hypermesh, Nastran and ANSYS. ANSYS (Analysis System), an efficient finite element package is used for nonlinear analysis of the present study.
International Journal of Civil Engineering and Technology (IJCIET) Volume 13, Issue 9, September 2022, pp. 1-13, Article ID: IJCIET_13_09_001, 2022
The failure behavior of reinforced concrete beam structural elements was modeled using computer software, ANSYS, to create the study presented in this paper. This study's goal was to ascertain how lower concrete and steel quality affected the way single reinforced concrete beam structural parts failed under tensile failure conditions. In this investigation, eight specimens of a straightforward 200x400x3000 mm with 2D16 single-reinforced beam have been modeled. A concentrated load will be applied to the beam in the middle of the beam span until it is collapsed. According to the study's findings, the quality of steel does not significantly change when the ultimate load is a flexural crack, and neither does the quality of concrete, which results in a smaller flexural capacity but a larger deflection. The crack pattern is also not significantly affected by this change. According to SNI 2847:2019, the flexural capacity of the ANSYS software analysis is comparable to the simplified calculation analysis, with a discrepancy of adequately reasonable. It is advisable for the low concrete steam rength beam with a low grade of reinforcement, whilst the higher concrete strength by using high-grade rebar.
Numerical modeling of combined reinforcement concrete beam
E3S Web of Conferences
Because polymer-composite reinforcements are a new material in construction, the possibilities of their use in load-bearing structures, including concrete beams, are somewhat limited by existing regulations. The research work implemented in this article is to study their strength and stiffness in cases where steel reinforcement is in the tensile zone and composite polymer reinforcement is in the compressive zone of concrete. Concrete beams with combined reinforcement are the object of the study, and the study of the stress-deformation state is its subject. The behavior of concrete beams with combined reinforcement under static load was studied. Considering the nonlinear properties of materials in the finite element method, their stress-strain states were investigated. A 3D beam model was created using the ANSYS Workbench 2022R1, and 3 series of samples were chosen and compared with hand calculations. The behavior of concrete beams with metal and composite reinforcement was carried o...
Ain Shams Engineering Journal, 2021
This paper presents the effect of non-uniform reinforcement ratio along the beam length on the flexural behaviour experimentally and numerically. Within the experiment, four reinforced concrete beams each had a different reinforcement ratio. However, three of four beams had a similar reinforcement ratio in the constant moment zone (0.012). Cracking load, load carrying and deflection were monitored through the test. A nonlinear finite element software was implemented to simulate the experimental behaviour. Followed up by a parametric study. It was found that, in reinforced concrete beams, the tension stiffening depends on the concrete area in the tension zone not the reinforcement ratio. FEA predicts the reinforced concrete beams behaviour within a good agreement. Finally, the findings show that, determining variable amount of reinforcement ratio along the beam length will not sacrifice the flexural behaviour, but it will reduce the quantity of the steel reinforcement and the overall cost.
Bulletin of the Polytechnic Institute of Iași. Construction. Architecture Section, 2021
Following the previous analytical studies performed with ATENA software for a series of RC moment resisting frame models, it were used in the pre-processing stage the stress-strain relation laws for concrete and steel reinforcement. These mathematical and graphical relations represent a necessity in the current conditions of numerical analysis and imply a correct knowledge of the deformation mode of the „reinforced concrete” which is a composite material. Thus, it is desired through this research paper the theoretical exposition of: equivalent uniaxial law for concrete, biaxial compressive failure and tensile failure consideration laws for concrete, bilinear with hardening law for steel reinforcement, cycling steel reinforcement model and steel reinforcement bond model. Finally, it will be possible to validate the correctness of the analytical RC frame systems through the experimental results of the optimal RC frame model after seismic platform testing.
Improving Flexural Moment Capacity of Concrete Beam by Changing the Reinforcement Configuration
International Journal of GEOMATE, 2021
The bar used for concrete beams is generally in shear or stirrups mounted perpendicular to the beam axis. The idea underlying this problem arises from the observation of reinforced concrete beams by changing the configuration of vertical shear reinforcement to less sloping reinforcement, which would be less relevant to the theory of its use. This study aims to analyze the skeletal system bending moment capacity reinforcing beams and producing a theoretical equation of the bending moment of reinforcing the skeletal system. This study is an experimental laboratory with twelve specimens consisting of three normal beams (BN) as control variable beams and nine frame reinforcement beams (BTR) as independent variables. Data were analyzed using the strength design method. The results showed that used reinforcement frame system increases the beam strength when it reaches the ultimate load on the flexural capacity with the MPF frame retaining moment on the BTR25 beam of 10.23%, the BTR50 beam of 7.47%, and the BTR75 beam of 4.60% of the beam BN and found the equation for calculated the frame retaining moment (MPF). The equation can be used for practical calculations of the retaining beam frame system (BTR).
Comparison of Dynamic Characteristics of Prestressed and Reinforced Concrete Beams
Düzce Üniversitesi Bilim ve Teknoloji Dergisi, 2019
To determine the dynamic characteristics of bridges built with prestressed and reinforced concrete beams, the dynamic properties of such beams should be known. Prestressing force is applied to the prestressed concrete (PSC) beam, unlike reinforced concrete (RC) beam. In this study, it is aimed to compare the dynamic properties of PSC and RC beams with the same material, section properties and effective span length. Dynamic properties such as the mode shapes and periods of the PSC and RC beam were determined by means of the formulation found in the literature and a computer program that uses the finite element method. For this study I-beam with 0.90m height and 15m effective span length was selected as an example. The selected beam was considered separately as PSC and RC. In the PSC beam, eight low-relaxation Grade270 prestressing strand with 15mm (0.6 in.) diameter were used, unlike reinforced concrete beams. Three dimensional finite element models (FEM) of PSC and RC beam were cons...
Reinforced concrete beams behaviour under static loads – in situ case study
Constructii: Journal of Civil Engineering Research, 2020
Sometimes there are reinforced concrete structures for which conventional computational methods are not sufficient to demonstrate their intended use. In-situ tests are conclusive to determine the ability of a structure to support additional loads, to determine its safety in the event of some design or construction deficiencies, degradation, or lack of design data. Thus, in-situ analysis validates the theoretical design approaches, in order to obtain data on the behavior of the studied elements. The aim of this paper is to present the groundwork and objectives of in-situ testing of reinforced concrete elements of buildings, with a view to possible structural assessments and to present the methods for carrying out the tests.
Advances in Engineering Software, 2009
In the design of reinforced concrete structures, a designer must satisfy not only the strength requirements but also the serviceability requirements, and therefore the control of the deformation becomes more important. To ensure serviceability criterion, it is necessary to accurately predict the cracking and deflection of reinforced concrete structures under service loads. For accurate determination of the member deflections, cracked members in the reinforced concrete structures need to be identified and their effective flexural and shear rigidities determined. The effect of concrete cracking on the stiffness of a flexural member is largely dependent on both the magnitude and shape of the moment diagram, which is related to the type of applied loading. In the present study, the effects of the loading types and the reinforcement ratio on the flexural stiffness of beams has been investigated by using the computer program developed for the analysis of reinforced concrete frames with members in cracked state. In the program, the variation of the flexural stiffness of a cracked member has been obtained by using ACI, CEB and probability-based effective stiffness model. Shear deformation effect is also taken into account in the analysis and the variation of shear stiffness in the cracked regions of members has been considered by employing reduced shear stiffness model available in the literature. Comparisons of the different models for the effective moment of inertia have been made with the reinforced concrete test beams. The effect of shear deformation on the total deflection of reinforced concrete beams has also been investigated, and the contribution of shear deformation to the total deflection of beam have been theoretically obtained in the case of various loading case by using the developed computer program. The applicability of the proposed analytical procedure to the beams under different loading conditions has been tested by a comparison of the analytical and experimental results, and the analytical results have been found in good agreement with the test results.
Effect of Column to Beam Strength Ratio on Performance of Reinforced Concrete Frames
A ductile reinforced concrete structure shall be designed to ensure that plastic hinges occur as many as possible before collapse. This paper investigates the effect of column to beam strength ratio on performance of ductile reinforced concrete buildings. Fourteen interior frame models of two building categories which are five and ten stories buildings were modeled and analyzed. The main parameter among those models is column to beam strength ratio of 1.0 to 2.0 which are 1.0, 1.2, 1.4, 1.6, 1.8, and 2.0. The values are the ratio between column nominal strength (∑M nc) and beam nominal strength (∑M nb). In this study, the ratio between column strength to beam probable strength (∑M prb) of 1.2 is also investigated. A static nonlinear pushover analysis was used to evaluate the performances of all models. Analysis results show that all models have a life safety performance level. A collapse mechanism of beam sway mechanism was achieved for strength ratios of 1.4 to 2.0 for five story frame models and 1.6 to 2.0 for ten story frames. The increase in the strength ratio up to 1.4 can increase ductility factor significantly, however, beyond that the strength ratio does not affect the ductility both for five and ten story frame models. Considering the ratio between column strength to beam probable strength of 1.2, the ductility factor increases by 16% and 25% respectively for five and ten stories, however, both frames still have performance level of life safety and collapse mechanism of column sway mechanism.