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 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 The effect of cracks on the bearing capacity of reinforced concrete slabs

2019 ◽  
Vol 97 ◽  
pp. 03001
Author(s):  
Vladimir Agapov
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Strain State ◽  
Concrete Slab ◽  
Physical Nonlinearity ◽  
Concrete Slabs ◽  
The Finite Element Method ◽  
Reinforced Concrete Slab ◽  
Reinforced Concrete Slabs ◽  
Composite Fabrics

Cracks occur in reinforced concrete slabs for two reasons - due to increased operational loads and due to manufacturing and installation defects. When cracks are detected, the question arises about the residual bearing capacity of the slab and the need of its strengthening. To solve this problem by calculation, it is necessary to take into account physical nonlinearity. An algorithm for the calculation by the finite element method is proposed. The main feature of the algorithm is the use of multilayered finite elements, which allows modeling the cracks by specifying the corresponding material characteristics of those layers which the crack passes through. A method for determining the bearing capacity of a slab with cracks after its reinforcement with composite fabrics is also considered. An example of the study of the stress-strain state of a reinforced concrete slab with cracks by the proposed method is given. The implementation of the algorithm in the PRINS program is described and the possibility of using this program for solving practical problems is discussed.

scholarly journals VISUAL PROGRAMMING SYSTEMS FOR ASSESSING THE SURVABILITY OF REINFORCED CONCRETE BUILDINGS

2021 ◽  
Vol 9 (4) ◽  
pp. 56-60
Author(s):  
Sergey Fedorov ◽  
Pavel Kaydas
Keyword(s):  
Reinforced Concrete ◽  
Strain State ◽  
Progressive Collapse ◽  
Experimental Studies ◽  
Visual Programming ◽  
Design Model ◽  
Stress Strain ◽  
Design Work ◽  
Stress Strain State ◽  
Time Required

The development of digital technologies serves as an important tool for solving urgent problems in the field of construction of new and reconstruction of existing real estate objects. The widespread introduction into practice of modern software systems that imply BIM technologies allows to avoid errors in the creation of design models of buildings and structures for the analysis of resistance to progressive collapse. This article examines the influence of the method of forming the design model on the qualitative and quantitative indicators of the parameters of the stress-strain state of the bearing system. The research methods are based on comparing the analysis results and the established parameters of the stress-strain state of the design model of a multi-storey building made of monolithic reinforced concrete when comparing them with the results of experimental studies. It was found that the use of BIM-technologies, in particular, the system of the graphic editor of algorithms for constructing the design scheme of the building using the SAPFIR-3D software complex, when analyzing the resistance to the phenomena of progressive collapse, does not reduce the quality of the executed design model. Together with a decrease in labor intensity and the number of possible errors, the use of the described technology for the formation of a computational model will reduce the time required for the design work, which will reduce the time required to prepare the necessary documentation.

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 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.

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.

Experimental and Computer Researches of Ferroconcrete Floor Slabs at High-Temperature Influences

2019 ◽  
Vol 968 ◽  
pp. 361-367 ◽  
Author(s):  
Andrii Kovalov ◽  
Yuriy Otrosh ◽  
Mykola Surianinov ◽  
Tatiana Kovalevska
Keyword(s):  
Computer Simulation ◽  
Reinforced Concrete ◽  
Concrete Slab ◽  
Experimental Studies ◽  
Numerical Data ◽  
Technical Condition ◽  
Distribution Data ◽  
Building Structures ◽  
Reinforced Concrete Slab ◽  
Reinforced Concrete Slabs

The unsatisfactory technical condition of many buildings and structures is due to their aging and requires a quick technical condition assessment. The most promising way for experimental researches data verification is computer modeling of structures, also during a fire. It is advisable to use the ANSYS software. Experimental fire tests of reinforced concrete slabs were carried out. In order to assess the experiment quality and the reliability of the received temperature distribution data, it was used a reinforced concrete slab computer simulation in the ANSYS R.17.1 software system. There was provided a comparative analysis of experimental studies results and numerical data analysis. The results confirm that method of conducted experimental research and computer simulation with further numerical analysis can be recommended for practical application. The mathematical model makes possible operative prediction for the controlled parameters values of building structures.

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