scholarly journals CARRYING CAPACITY OF DAMAGED REINFORCED CONCRETE TWO-TUBE COLUMNS

2021 ◽  
pp. 18-27
Author(s):  
Ye.V. Klymenko ◽  
◽  
N.R. Antoniuk ◽  
E.V. Maksiuta ◽  
◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Strain State ◽  
Concrete Columns ◽  
Stress Strain ◽  
Reinforced Concrete Columns ◽  
Stress Strain State ◽  
Relative Eccentricity ◽  
Main Factors ◽  
Damage Front

Abstract. The article presents the results of experimental and theoretical studies of the work, the parameters of the stress-strain state and the methodology for calculating the residual bearing capacity of reinforced concrete I-section columns damaged during operation and combat operations. The analysis of the literature on this subject made it possible to study the main factors affecting the residual bearing capacity, namely: the depth of damage; the angle of inclination of the damage front; relative eccentricity of application of external compressive force. A three-factor three-level experimental design has been developed. The conducted field tests of prototypes of damaged reinforced concrete columns made it possible to determine the parameters of the stress-strain state of damaged elements and their actual residual bearing capacity. On the basis of the performed experimental-statistical modeling, the main factors influencing the residual bearing capacity of damaged elements have been established. The prerequisites for calculating damaged reinforced concrete I-beams are proposed and equilibrium equations are drawn up. The proposals set out in the article are based on the main provisions of the current norms and expand the effect of their use. The analysis of influence of various factors on bearing capacity of the damaged I-beam reinforced concrete columns is carried out. It was found that the columns can withstand a maximum destructive load of 1738 kN at an angle of inclination of the damage front of 60о and in the absence of relative eccentricity. And the least destructive load columns can withstand in the absence of the angle of the damage front, and the relative eccentricity will be 1/8 of the applied load. On the basis of the conducted researches the technique of definition of reliably substantiated residual bearing capacity of reinforced concrete compressed elements of a T-profile profile damaged in the course of operation is developed. This makes it possible to determine the possibility of further trouble-free operation of structures or the need for their reinforcement or reconstruction.

scholarly journals COMPUTER MODELLING OF THE STRESS-STRAIN STATE OF PLUG-IN CONNECTIONS OF REINFORCED CONCRETE COLUMNS WITH THE COVERAGE PLATES UNDER THE OUT-OF-SQUARE ECCENTRIC COMPRESSION

2018 ◽  
Vol 14 (3) ◽  
pp. 126-135
Author(s):  
Boris S. Sokolov ◽  
Evgeniy O. Troshkov
Keyword(s):  
Reinforced Concrete ◽  
Strain State ◽  
Computer Modelling ◽  
Concrete Columns ◽  
Stress Strain ◽  
Reinforced Concrete Columns ◽  
Stress Strain State ◽  
Eccentric Compression ◽  
Research Plan ◽  
Bearing System

he technique and results of computer simulation of the stress-strain state of plug joints of reinforced concrete columns with overlap plates under the effect of out-of-square eccentric compression are described. An analysis of the results obtained is provided to optimize the experimental research plan and to develop a technique for calculating the strength of the joints used in the UICSS bearing system.

Results of Numerical Modeling the Stress-Strain State of Damaged Reinforced Concrete Columns in the Middle Row of the Industrial Building

2019 ◽  
Vol 968 ◽  
pp. 342-347
Author(s):  
Viktor Dariienko ◽  
Dmytro Artemenko ◽  
Olexandr Lizunkov ◽  
Oleh Plotnikov
Keyword(s):  
Numerical Modeling ◽  
Reinforced Concrete ◽  
Strain State ◽  
Concrete Columns ◽  
Industrial Building ◽  
Reinforced Concrete Column ◽  
Stress Strain ◽  
Reinforced Concrete Columns ◽  
Stress Strain State ◽  
Concrete Body

The article is devoted to the investigation of the influence of columns’ concrete body destruction size on the bearing capacity of building structures. The joint spatial work of steel strengthening structures with reinforced concrete constructions is investigated. The results of numerical modeling the stress-strain state of damaged reinforced concrete columns in the middle row of the industrial building are presented. The numerical modeling was executed in the system NASTRAN. It was carried out the numerical calculation of reinforced concrete column in the middle row without damages. Then it was modeled the column damage in form of a "downed" concrete angle to a depth of 50, 100 and 200 mm and denudation of bearing longitudinal armature at length of 1000 mm from supporting part of the column. In this case two separate models were investigated - with the location of damage from the compressed or extended side of the column. The conclusions about feasibility of columns strengthening by steel clip are made.

STRESS-STRAIN STATE OF ECCENTRICALLY COMPRESSED REINFORCED CONCRETE COLUMNS OF CIRCULAR CROSS-SECTION

2018 ◽  
Vol 8 (1) ◽  
pp. 4-9
Author(s):  
Sergey S. MORDOVSKY ◽  
Rustam I. DAVLIKAMOV
Keyword(s):  
Reinforced Concrete ◽  
Cross Section ◽  
Nonlinear Deformation ◽  
Strain State ◽  
Circular Cross Section ◽  
Concrete Columns ◽  
Deformation Model ◽  
Stress Strain ◽  
Reinforced Concrete Columns ◽  
Nonlinear Deformation Model

Theoretical studies of reinforced concrete eccentrically compressed columns of circular cross-section on strength indexes are analyzed. These studies rely on the use of a nonlinear deformation model that approximates the work of concrete to real experimental conditions. A comparative analysis of the results of calculating the strength of reinforced concrete columns of circular cross-section is carried out according to the methodology proposed in the current set of rules, is the author’s program for determining the stress-strain state of a reinforced concrete column of circular cross-section implemented in the MathCad software environment. The results of a numerical experiment are compared in the form of a fi nite-element model in the Lira-CAD program complex using a nonlinear deformation model. Calculations and schemes are given taking into account the possibility of conducting an experimental study.

scholarly journals Experimental research of punching shear mechanism of reinforcing concrete slab

2019 ◽  
Vol 97 ◽  
pp. 04032
Author(s):  
Nikolay Trekin ◽  
Dmitrii Pekin
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Experimental Research ◽  
Strain State ◽  
Concrete Slab ◽  
Punching Shear ◽  
Concrete Slabs ◽  
Stress Strain ◽  
Stress Strain State ◽  
Reinforced Concrete Slabs

The analysis of various regulatory methods for calculating reinforced concrete slabs for pushing and comparing with experiment results is made. The tested sample, measuring equipment and test bench are described. Sizes and materials for experimental prototype were chosen by existing beamless and capless slabs of monolithic reinforced concrete superstructures with column grid from 8×8 to 9×9 m. Experimental research results of reinforcing concrete plate structure are presented for study purpose of stress-strain state when punching shear collapse occurring. Various aspects and observations obtained during the test are given. The comparison of the tested slab fragment with the complete response of slab structure is performed. Analysis of tested sample stress-strain state and punching bearing capacity calculations results in according to existing regular standards were made. Main criterias of punching shear collapse were determined and new procedure for punching calculation of RC concrete slabs was offered basing on significantly new approach in punching bearing capacity defining.

scholarly journals Investigation of the bearing capacity of reinforced concrete beams strengthened with reinforced concrete ring under load

2014 ◽  
Vol 13 (3) ◽  
pp. 065-070
Author(s):  
Zinoviy Blikharskyy ◽  
Dmytro Dubizhanskyy ◽  
Roman Khmil
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Cross Section ◽  
Strain State ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Stress Strain ◽  
Normal Cross Section ◽  
Stress Strain State ◽  
Concrete Ring

Bearing capacity of normal cross section of bending concrete elements reinforced with reinforced concrete ring under load was investigated. Experimental researches of 4 sets of beams with the total number of 16 units were carried out. The results of changes of stress-strain state settings depending on the load level, additional reinforcement, influence of limit level load were analyzed. The three characteristic stages of stress-strain state of reinforced concrete beams strengthened with reinforced concrete ring were defined. Results of experimental investigations of bearing capacity of normal cross section of strengthened beams with reinforced concrete ring under load were presented. Enhancing effect was calculated. According to the results of researches of strengthened beams plots of strain of working armature depending on current bending moment were constructed.

Bending Effect On The Mechanism Of Punching The Support Zone Of The Reinforced Concrete Slab

2019 ◽  
pp. 20-28
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Strain State ◽  
Concrete Slab ◽  
Experimental Studies ◽  
Reinforced Concrete Structure ◽  
Stress Strain ◽  
Reinforced Concrete Slab ◽  
Stress Strain State ◽  
Reinforced Concrete Slabs

The analysis of various regulatory methods for calculating reinforced concrete slabs for punching and comparing with experiment results is made. The tested sample, measuring equipment and test bench are described. Dimensions and materials for the production of the prototype were chosen on the basis of experience in the construction of girderless and capless regular monolithic reinforced concrete frames. The results of experimental studies of a fragment of a slab reinforced concrete structure in order to study the stress-strain state, when implementing the mechanism of punching, are presented. The results of observations obtained during the tests are presented. A comparison of the nature of operation of the tested fragment of the slab with the nature of operation of the full-fledged construction is given. A comparative analysis of the stress-strain state of the tested sample and the results of the calculation of the bearing capacity for punching according to various normative methods is performed. According to the results of the experiment, the main criteria determining the implementation of the punching mechanism are established, and a new method for calculating girderless floors is proposed on the basis of a fundamentally different approach in determining the bearing capacity.

scholarly journals Research of the Residual Bearing Capacity and the Work of Damaged Reinforced Concrete Beams’ Inclined Sections

2020 ◽  
Vol 14 (4) ◽  
pp. 466-472
Author(s):  
Zeljko Kos ◽  
Yevhenii Klymenko ◽  
Kostiantyn Polianskyi ◽  
Andjelko Crnoja
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Strain State ◽  
Concrete Beams ◽  
Numerical Test ◽  
Neutral Axis ◽  
Reinforced Concrete Beams ◽  
Stress Strain ◽  
Software Complex ◽  
Stress Strain State

The article is devoted to studies about the stress-strain state and the residual bearing capacity of inclined sections of reinforced concrete beams with concrete damages in the compressed zone near support areas. The developed method of calculating the bearing capacity of the inclined sections of damaged beams is described. The numerical test of prototypes was performed in the LIRA-CAD 2017 software complex. A comparison of the results of laboratory tests, a numerical experiment and calculation results by the proposed method is shown. It is stressed that with an increase in the area of damage, the bearing capacity decreases. The nature of the change in the stress-strain state under the presence of damage is described. It is pointed out that in the damaged samples, there is an inclination of the neutral axis in the cross section of the element – it tilts, the neutral axis becomes, almost, parallel to the front of the damage.

scholarly journals Bearing Capacity near Support Areas of Continuous Reinforced Concrete Beams and High Grillages

2022 ◽  
Vol 12 (2) ◽  
pp. 685
Author(s):  
Zeljko Kos ◽  
Yevhenii Klymenko ◽  
Irina Karpiuk ◽  
Iryna Grynyova
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Physical Model ◽  
Strain State ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Transverse Load ◽  
Foundation Design ◽  
Stress Strain ◽  
Stress Strain State

This work presents a proposed engineering method for calculating the bearing capacity of the supporting sections of continuous monolithic reinforced concrete tape beams, which combine pressed or driven reinforced concrete piles into a single foundation design. According to the mechanics of reinforced concrete, it is recommended to consider the grillage to be a continuous reinforced concrete beam, which, as a rule, collapses according to the punching scheme above the middle support (pile caps), with the possible formation of a plastic hinge above it. The justification for the proposed method included the results of experimental studies, comparisons of the experimental tensile shear force with the results of calculations according to the design standards of developed countries, and modeling of the stress-strain state of the continuous beam grillage in the extreme span and above the middle support-pile adverse transverse load in the form of concentrated forces. The work is important, as it reveals the physical essence of the phenomenon and significantly clarifies the physical model of the operation of inclined sections over the middle support. The authors assessed the influence of design factors in continuous research elements, and on the basis of this, the work of the investigated elements under a transverse load was simulated in the Lira-Sapr PC to clarify the stress-strain state and confirm the scheme of their destruction adopted in the physical model by the finite element method in nonlinear formulation. Based on the analysis and comparison of the experimental and simulation results, a design model was proposed for bearing capacity near the supporting sections of continuous reinforced concrete beams and high grillages that is capable of adequately determining their strength.

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