scholarly journals The design model of reinforced concrete beam formed by the field of cracks directions

2019 ◽  
Vol 97 ◽  
pp. 04017
Author(s):  
Sofia Kurnavina ◽  
Ilya Tsatsulin
Keyword(s):  
Differential Equation ◽  
Reinforced Concrete ◽  
Concrete Beam ◽  
Longitudinal Force ◽  
Reinforced Concrete Beam ◽  
Equation Of Motion ◽  
Dynamic Loads ◽  
Force Ratio ◽  
Internal Forces ◽  
Static And Dynamic Loads

Now the design of reinforced concrete constructions for static and dynamic loads with regard to the elastoplastic resistance diagrams of materials is widely used. The model of a reinforced concrete beam is proposed, which consists of trapezoidal elements formed by the field of cracks directions. The theoretical angle of inclination of a crack at any point of a beam has been determined on the basis of minimum of external load, necessary for its formation, which has been obtained from the equation of energy balance. The deflections of each point of a beam have been obtained by solving a differential equation of motion at each step the account. The strains in any fiber of normal and inclined sections have been determined according to the hypothesis of bilinear sections. The stresses in concrete and reinforcement have been obtained with the help of the variable elastoplastic stress-strain curves «σ-ε». The failure mechanism of a beam has been determined on a basis of the transverse to longitudinal force ratio in compressed area of concrete. The internal forces have been determined with the help of numerical section height integration of stresses and from the equation of balance of elements above the crack.

scholarly journals REINFORCED CONCRETE BEAM AND COLUMN PROGRAMMING BASED ON SNI:2847-2019 ON SMARTPHONE USING TEXAS INSTRUMENTS

ASTONJADRO ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 287
Author(s):  
Toni Hartono Bagio ◽  
Eugene Yudhistira Baggio ◽  
Sri Wiwoho Mudjanarko ◽  
Pio Ranap Tua Naibaho
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Technology Development ◽  
Reinforced Concrete Beam ◽  
Quadratic Equation ◽  
Texas Instrument ◽  
Quadratic Equation Method ◽  
Internal Forces ◽  
Compression Area ◽  
Manual Calculation

<p class="Isiabstract">The development of technology in the last few years can not be denied that it has developed very rapidly. In building construction, reinforced concrete beam and columns calculations also utilizing that technology development. Input data used to calculate reinforcement of beam and column are material property, section property and internal forces. Calculation of reinforcement beam using quadratic equation method and reinforcement column using Newton-Raphson method and divided-by-two method.Calculation results are flexural reinforcement As (longitudinal compression area) and As' (longitudinal tension area), shear reinforcement Av (transversal area) and S (distance of  Av), torsional reinforcement Avt (transversal area due to torsional and/or shear), S (distance of Avt), Along (longitudinal area due to torsional buckling), column circular reinforcement Atot (total of longitudinal area), column rectangular two faces reinforcement Atot (total of longitudinal area), column rectangular four faces reinforcement Atot (total of longitudinal area), column biaxial reinforcement Atot (total of longitudinal area).   The program determines As, As’ and Atotal, the code is written using the Texas Instruments programming language, so that it can be applied to smartphones. Smartphone and manual calculation, for all cases not more than 5%, the calculation using Texas Instrument is accurate.</p>

Strength of Interior Reinforced Concrete Beam-Column Assembles

2011 ◽  
Vol 250-253 ◽  
pp. 3506-3509
Author(s):  
Jung Yoon Lee ◽  
Jong Wook Park ◽  
Sang A Cha
Keyword(s):  
Compressive Strength ◽  
Shear Strength ◽  
Reinforced Concrete ◽  
Axial Force ◽  
Reasonable Agreement ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Strength Deterioration ◽  
Force Ratio ◽  
Compressive Strength Of Concrete

This paper provides a method to predict the strength of interior reinforced concrete beam-column joints that fail in shear before the plastic hinges occur at both ends of the adjacent beams. The proposed method takes into account the axial force ratio, the compressive strength of concrete, and the shear strength deterioration in the beam-column joints. In order to verify the shear strength of the proposed method, the behaviors of 38 interior beam-column joints were compared. Comparisons between the observed and calculated shear strengths of the tested beam-column assembles, showed reasonable agreement.

On-Site Determination of the Polarization Resistance in a Reinforced Concrete Beam

CORROSION ◽  
1988 ◽  
Vol 44 (10) ◽  
pp. 761-765 ◽  
Author(s):  
S. Feliu ◽  
J. A. Gonzalez ◽  
C. Andrade ◽  
V. Feliu
Keyword(s):  
Reinforced Concrete ◽  
Polarization Resistance ◽  
Concrete Beam ◽  
Reinforced Concrete Beam

Analysis of reinforced concrete beam with small fibre

2020 ◽  
Author(s):  
Pavlina Mateckova ◽  
Zuzana Marcalikova ◽  
David Bujdoš ◽  
Marie Kozielova
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Small Fibre

Evaluation of Severely Damaged Reinforced Concrete Beam Repaired with Epoxy Injection using Acoustic Emission Technique

2021 ◽  
pp. 102890
Author(s):  
Soffian Noor Mat Saliah ◽  
Noorsuhada Md Nor ◽  
Noorhazlinda Abd Rahman ◽  
Shahrum Abdullah ◽  
Mohd Subri Tahir
Keyword(s):  
Acoustic Emission ◽  
Reinforced Concrete ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Acoustic Emission Technique

scholarly journals Toward Structural Health Monitoring of Civil Structures Based on Self-Sensing Concrete Nanocomposites: A Validation in a Reinforced-Concrete Beam

2021 ◽  
Vol 15 (1) ◽  
Author(s):  
Diego L. Castañeda-Saldarriaga ◽  
Joham Alvarez-Montoya ◽  
Vladimir Martínez-Tejada ◽  
Julián Sierra-Pérez
Keyword(s):  
Reinforced Concrete ◽  
Damage Detection ◽  
Direct Current ◽  
Health Monitoring ◽  
Electrical Resistance ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Structural Member ◽  
Rc Beam ◽  
Electric Resistance

AbstractSelf-sensing concrete materials, also known as smart concretes, are emerging as a promising technological development for the construction industry, where novel materials with the capability of providing information about the structural integrity while operating as a structural material are required. Despite progress in the field, there are issues related to the integration of these composites in full-scale structural members that need to be addressed before broad practical implementations. This article reports the manufacturing and multipurpose experimental characterization of a cement-based matrix (CBM) composite with carbon nanotube (CNT) inclusions and its integration inside a representative structural member. Methodologies based on current–voltage (I–V) curves, direct current (DC), and biphasic direct current (BDC) were used to study and characterize the electric resistance of the CNT/CBM composite. Their self-sensing behavior was studied using a compression test, while electric resistance measures were taken. To evaluate the damage detection capability, a CNT/CBM parallelepiped was embedded into a reinforced-concrete beam (RC beam) and tested under three-point bending. Principal finding includes the validation of the material’s piezoresistivity behavior and its suitability to be used as strain sensor. Also, test results showed that manufactured composites exhibit an Ohmic response. The embedded CNT/CBM material exhibited a dominant linear proportionality between electrical resistance values, load magnitude, and strain changes into the RC beam. Finally, a change in the global stiffness (associated with a damage occurrence on the beam) was successfully self-sensed using the manufactured sensor by means of the variation in the electrical resistance. These results demonstrate the potential of CNT/CBM composites to be used in real-world structural health monitoring (SHM) applications for damage detection by identifying changes in stiffness of the monitored structural member.

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