scholarly journals COMPUTER TECHNOLOGIES IN THE FORMATION OF COMPUTED MODELS OF MONOLITHIC REINFORCED CONCRETE STRUCTURES

2017 ◽  
Vol 13 (4) ◽  
pp. 37-46 ◽  
Author(s):  
Anatoliy I. Bedov ◽  
Aleksandr S. Salov ◽  
Azat I. Gabitov ◽  
Dmitriy М. Kuznetsov ◽  
Elza A. Sadykova
Keyword(s):  
Reinforced Concrete ◽  
Analytical Models ◽  
Structural Elements ◽  
Reinforced Concrete Frame ◽  
Concrete Element ◽  
Concrete Frame ◽  
Numerical Studies ◽  
Deformation State ◽  
Rational Combination ◽  
The Relationship

The areas of application of concrete and reinforcement of higher grades for strength in structural elements of a monolithic reinforced concrete frame are considered. Analytic dependencies, criteria and boundary conditions are proposed that numerically describe the relationship between increasing the strength of concrete and reducing the consumption of reinforcing steel for bent and compressed-bent elements. Calculation-analytical models of the deformation state of overlaps of a monolithic reinforced concrete multi-storey frame have been developed on the basis of multifactor numerical studies carried out for various values of the thicknesses of ceilings, spans, operating loads, classes of concrete and reinforcement. Calculated parameters of slabs are determined, which determine their bearing capacity. On the basis of computer technology, the optimum section of a reinforced concrete element is modeled according to the criterion of reducing the material consumption and rational combination of classes of concrete and reinforcement.

scholarly journals Factors in the Relationship Between Optimal CO2 Emission and Optimal Cost of the RC Frames

2020 ◽  
Author(s):  
Lida Mottaghi ◽  
Ramezan Ali Izadifard ◽  
Ali Kaveh
Keyword(s):  
Reinforced Concrete ◽  
Co2 Emissions ◽  
Carbon Dioxide Emissions ◽  
Reinforced Concrete Frame ◽  
Optimal Cost ◽  
Concrete Frame ◽  
Rc Frames ◽  
Greenhouse Gases Emissions ◽  
The Cost ◽  
The Relationship

Nowadays, reduction of greenhouse gases emissions from the construction industry is seriously under investigation. The aim of this study is to investigate the various effective factors on the relationship between optimal cost and optimal carbon dioxide emissions of the reinforced concrete structures with nonlinear structural behavior. A four-story reinforced concrete frame is designed for various peak ground accelerations (PGAs) and all ductility classes according to Iran’s seismic resistant design-2800 code, as well as for different concrete classes. The frames are optimally designed according to ACI 318-08 and FEMA codes. The results of optimal designs show that the design of structures with medium and high ductility class produces less cost and CO2 emissions than the low ductility class. On the other hand, the relationship between cost and CO2 emissions shows that in the low ductility class, increasing the percentage of the optimal cost can greatly reduce the amount of CO2 emissions. PGA design has a significant effect on reducing optimal cost and CO2 emissions. Especially in the low ductility class, reducing this parameter can greatly decrease the amount of the objective functions. Also, the use of concrete with low class can reduce the cost and CO2 emissions but the effect of this parameter in the objective is very small.

Seismic Behavior of Reinforced Concrete Frame Columns with Different Volumetric Percentage of Stirrups

2012 ◽  
Vol 166-169 ◽  
pp. 2046-2049 ◽  
Author(s):  
Shan Suo Zheng ◽  
Yue Heng Yan ◽  
Qing Lin Tao ◽  
Wen Yong Li
Keyword(s):  
Reinforced Concrete ◽  
Seismic Behavior ◽  
Low Frequency ◽  
Reinforced Concrete Frame ◽  
Reinforced Concrete Column ◽  
New Members ◽  
Skeleton Curve ◽  
Concrete Frame ◽  
The Relationship ◽  
Constant Axial Load

Based on the experiments of a reinforced concrete frame column, 5 new members with different volumetric percentage of stirrups which are applied with constant axial load and horizontal low-frequency cyclic load are analyzed with ABAQUS. This paper aims to study the relationship between volume-stirrup ratio and seismic behavior of reinforced concrete column. By analyzing skeleton curve and hysteretic curve of members, the results show that, if stirrups are reasonably arranged and the volume-stirrup ratio is larger enough, the good ductility, carrying capacity, energy dissipation capacity, and seismic behavior still be obtained with high axial compression ratio.

DYNAMIC STRENGTH CRITERIA OF PRESTRESSED REINFORCED CONCRETE STRUCTURES WITH COMBINED STRENGTH

2021 ◽  
Vol 97 (5) ◽  
pp. 51-61
Author(s):  
T.A. ILIUSHCHENKO ◽  
◽  
N.V. FEDOROVA ◽  
◽  
Keyword(s):  
Reinforced Concrete ◽  
Crack Resistance ◽  
Dynamic Strength ◽  
Dynamic Effect ◽  
Reinforced Concrete Frame ◽  
Concrete Element ◽  
Strength Criteria ◽  
Concrete Frame ◽  
General Terms ◽  
Principal Axes

Dynamic strength criteria and crack resistance criteria are given for a typical plane-stressed reinforced concrete element with prestressed reinforcement in one direction. The criteria are constructed by generalizing the theory of plasticity of concrete and reinforced concrete G.A. Geniev on the area of existence of tensile stresses: "tension- tension" and "compression- tension". In general terms, the crack resistance condition and strength condition of a prestressed reinforced concrete plane-stressed element are presented in the form of an ellipse in the coordinates of the main stresses. In this case, in contrast to the criteria of crack resistance of a flat unstressed element, the principal axes of the ellipse don’t pass through the origin. The results of a comparative analysis of the calculated and experimental data on crack resistance and strength for prestressed reinforced concrete in the support zone of the beam of a monolithic reinforced concrete frame tested for a given design load and a special dynamic effect are given.

Numerical investigation of reinforced concrete frame behavior subjected to progressive collapse

2018 ◽  
Vol 4 (3) ◽  
pp. 117 ◽  
Author(s):  
Mohammad Bagher Paripour ◽  
Ahmet Budak ◽  
Oğuz Akın Düzgün
Keyword(s):  
Reinforced Concrete ◽  
Structural Design ◽  
Progressive Collapse ◽  
Experimental Studies ◽  
Rc Frame ◽  
Structural Elements ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
A Chain ◽  
Good Agreement

Progressive collapse is defined as the spread of an initial local failure of a structure. This phenomenon, caused by the removal of one or more load-bearing element, is followed by a chain of failures through the structure and ultimately leads to partial or even full collapse of an entire structure. As a result, an accurate understanding of structural behavior subjected to large displacements, caused by progressive collapse, is essential to ensure a safe structural design. A progressive collapse in buildings often starts with the removal of one or more columns and continues with the collapse of adjoining structural elements. Experimental studies on progressive collapse are generally not recommended because of its cost and safety reasons. Today, as a result of progress in computer technology, more complicated problems can be investigated numerically. In this study, a numerical model is used for nonlinear analysis of a reinforced concrete (RC) frame behavior subjected to progressive collapse. It is obtained that there is a good agreement between the results with those of the experimental study given in the literature. According to the results, it can be predicted numerically the response of an RC frame to progressive collapse at a highly accurate level.

scholarly journals Shear Behavior of a Reinforced Concrete Frame Retrofitted with a Hinged Steel Damping System

2020 ◽  
Vol 12 (24) ◽  
pp. 10360
Author(s):  
Hyun-Do Yun ◽  
Sun-Woong Kim ◽  
Wan-Shin Park ◽  
Sun-Woo Kim
Keyword(s):  
Reinforced Concrete ◽  
Shear Behavior ◽  
Seismic Retrofitting ◽  
Reinforced Concrete Frame ◽  
Main Research ◽  
Torsion Spring ◽  
Concrete Frame ◽  
Energy Dissipation Capacity ◽  
Research Questions ◽  
Torsion Springs

The purpose of this study was to experimentally evaluate the effect of a hinged steel damping system on the shear behavior of a nonductile reinforced concrete frame with an opening. For the experimental test, a total of three full-scale reinforced concrete frame specimens were planned, based on the “no retrofitting” (NR) specimens with non-seismic details. The main research questions were whether the hinged steel damping system is reinforced and whether torsion springs are installed in the hinged steel damping system. From the results of the experiment, the hinged steel damping system (DR specimen) was found to be effective in seismic retrofitting, while isolating the opening of the reinforced concrete (RC) frame, and the torsion spring installed at the hinged connection (DSR specimen) was evaluated to be effective in controlling the amount of deformation of the upper and lower dampers. The strength, stiffness, and energy dissipation capacity of the DSR specimen were slightly improved compared to the DR specimen, and it was confirmed that stress redistribution was induced by the rotational stiffness of the torsion spring installed in the hinge connection between the upper and lower frames.

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.

Resistance of Reinforced Concrete Frames with Masonry Infill Walls to In-Plane Vertical Loading

2016 ◽  
Vol 711 ◽  
pp. 982-988
Author(s):  
Alex Brodsky ◽  
David Z. Yankelevsky
Keyword(s):  
Reinforced Concrete ◽  
Failure Modes ◽  
Progressive Collapse ◽  
Lateral Loading ◽  
Masonry Walls ◽  
Reinforced Concrete Frame ◽  
Masonry Infill ◽  
Concrete Frame ◽  
Vertical Loading ◽  
Infill Masonry

Numerous studies have been conducted on the in plane behavior of masonry infill walls to lateral loading simulating earthquake action on buildings. The present study is focused on a problem that has almost not been studied regarding the vertical (opposed to lateral) in-plane action on these walls. This may be of concern when a supporting column of a multi-storey reinforced concrete frame with infill masonry walls undergoes a severe damage due to an extreme loading such as a strong earthquake, car impact or military or terror action in proximity to the column. The loss of the supporting column may cause a fully or partly progressive collapse to a bare reinforced concrete frame, without infill masonry walls. The presence of the infill masonry walls may restrain the process and prevent the development of a progressive collapse. The aim of the present study is to test the in-plane composite action of Reinforced Concrete (RC) frames with infill masonry walls under vertical loading through laboratory experiments and evaluate the contributions of infill masonry walls, in an attempt to examine the infill masonry wall added resistance to the bare frame under these circumstances. Preliminary results of laboratory tests that have been conducted on reinforced concrete infilled frames without a support at their end, under monotonic vertical loading along that column axis will be presented. The observed damages and failure modes under vertical loading are clearly different from the already known failure modes observed in the case of lateral loading.

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