scholarly journals Verification of the eccentrically compressed reinforced concrete column calculation model based on the results of a full-scale experimental study

2018 ◽  
Vol 251 ◽  
pp. 04013 ◽  
Author(s):  
Mikhail Andreev ◽  
Sergey Bulushev ◽  
Marina Dudareva
Keyword(s):  
Reinforced Concrete ◽  
Finite Elements ◽  
Software Package ◽  
Experimental Studies ◽  
Concrete Column ◽  
Structural Elements ◽  
Reinforcing Bars ◽  
Reinforced Concrete Column ◽  
Comparison Of The Results ◽  
Joint Behavior

The article presents the results of a numerical experiment consisting in a test of an eccentrically compressed reinforced concrete column and comparison of the results obtained with the results of experimental studies. With the development of numerical methods and software packages, methods (techniques) of modeling structural elements using more detailed calculation models with solid finite elements that allow direct consideration of the joint behavior of concrete and reinforcing bars become relevant. The use of such methods requires verification of individual load-bearing structural elements, such as columns, beams, slabs. The article refers to a nonlinear concrete model – Continuous Surface Cap Model (CSCM). This model is implemented in the LS-DYNA software package and enables to consider the joint behavior of reinforcing bars and concrete, using bar (for reinforcing bars) and solid (for concrete) finite elements. An eccentrically compressed reinforced concrete column of square section with dimensions of 150х150х1150 (h) mm is chosen as an object of modeling. The studies have shown that the ultimate breaking load on the column based on the results of numerical modeling is consistent with the experimental values (discrepancy does not exceed 3.4%). The pattern of development of cracks and fractures, obtained from the results of modeling in the LS-DYNA software package corresponds to the pattern of fractures obtained as a result of experimental studies. According to comparison of the results obtained, it can be argued that a numerical test showed good agreement with the results obtained during full-scale experiments.

scholarly journals Verification of the reinforced concrete beam model based on the results of a full-scale experimental study

2018 ◽  
Vol 196 ◽  
pp. 01029 ◽  
Author(s):  
Oleg Mkrtychev ◽  
Mikhail Andreev
Keyword(s):  
Reinforced Concrete ◽  
Finite Elements ◽  
Software Package ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Full Scale ◽  
Bending Test ◽  
Reinforcing Bars ◽  
Concrete Elements ◽  
Joint Behavior

The article presents the results of a numerical experiment consisting in a bending test of a reinforced concrete beam and comparison of the results obtained with the results of full-scale experiments. In most cases, it is not possible to adequately consider all types of nonlinearities when using simplified bar and plate elements. The problem can be solved by using more detailed computational models with solid finite elements, allowing to consider directly the joint behavior of reinforcing bars and concrete. The studies were carried out in the LS-DYNA software package, which implemented the nonlinear concrete model – Continuous Surface Cap Model (CSCM). This model allows to consider the joint behavior of reinforcing bars and concrete, using bar (for reinforcing bars) and solid (for concrete) finite elements, thereby helping to overcome existing shortcomings in the diagrams of concrete behavior. As an object of modeling, a reinforced concrete statically determinable beam of rectangular section with dimensions of 1,000 х 50 х 100 (h) mm is considered. The conducted studies showed that the ultimate load on the beam based on the results of numerical modeling is quite consistent with the experimental value (8.5% discrepancy). The arrangement of cracks and the fracture pattern obtained from the modeling results in the LS-DYNA software package are in good agreement with the results of the tests. The LS-DYNA software package will allow correct solid modeling of bending reinforced concrete elements with specification of nonlinear diagrams of concrete and reinforcing bars deformation and can be used for research, calculation and design of reinforced concrete elements of buildings and structures.

Non-Linear Analysis of Z-Shaped Section Reinforced Concrete Column

2011 ◽  
Vol 366 ◽  
pp. 276-280
Author(s):  
Tie Cheng Wang ◽  
Xuan Chen
Keyword(s):  
Reinforced Concrete ◽  
Great Influence ◽  
Linear Analysis ◽  
Material Strength ◽  
Concrete Column ◽  
Analysis Method ◽  
Reinforcing Bars ◽  
Reinforced Concrete Column ◽  
Column Section ◽  
Shaped Section

Making use of the numerical analysis method, the ductility of reinforced concrete column with Z-shaped cross-section was analyzed. Considering stirrup confinements’ influence upon concrete deformation, with using self-made programs, some elements imposing influence on column section ductility were analyzed, such as axial compressive ratio、loading angle、material strength and setting mode of reinforcing bars. The results indicates that the loading angle has great influence on section especially under smaller compressive ratio, while the strength changes of the concrete and reinforced bars has a little influence. Thus, without changing amount of steel, encrypted hooping will effectively improve the ductility of column section.

scholarly journals Experimental and Numerical Evaluation of Concentrically Loaded RC Columns Strengthening by Textile Reinforced Concrete Jacketing

2020 ◽  
Vol 6 (8) ◽  
pp. 1428-1442
Author(s):  
Dang Quang Ngo ◽  
Huy Cuong Nguyen ◽  
Dinh Loc Mai ◽  
Van Hiep Vu
Keyword(s):  
Reinforced Concrete ◽  
Software Package ◽  
Numerical Evaluation ◽  
Concrete Column ◽  
Finite Element Models ◽  
Textile Reinforced Concrete ◽  
Reinforced Concrete Column ◽  
Premature Failure ◽  
Numerical Studies ◽  
Strengthening Technique

Nowadays, Textile Reinforced Concrete (TRC) has become a very popular strengthening technique for concrete structures. This paper presents an investigation on the applicability of TRC for strengthening reinforced concrete column. Both experimental and numerical studies are conducted to evaluate the confinement effects of various TRC strengthening schemes. The experimental study is performed on a series of six reinforced concrete square columns tested to failure. Two of them were un-strengthened as references, the other four were strengthened by one or two layers of Carbon Textile Reinforced Concrete (CTRC). The results indicated that the application of carbon TRC enhanced the ductility and ultimate strength of the specimens. Failure of all strengthened columns was together with tensile rupture of textile reinforcements at the corners of column. Finite element models of the CTRC strengthened columns based on ATENA software package were developed and verified with the experimental results. The analytical results show that in the specimen corner areas, textile reinforcements are subjected to a 3D complicated stress state and this may be the cause of their premature failure.

scholarly journals Verification of the reinforced concrete column bar model based on the test results

2018 ◽  
Vol 251 ◽  
pp. 04014 ◽  
Author(s):  
Oleg Mkrtychev ◽  
Marina Dudareva ◽  
Mikhail Andreev
Keyword(s):  
Reinforced Concrete ◽  
Finite Elements ◽  
Reference Model ◽  
Computing Time ◽  
Breaking Load ◽  
Fracture Pattern ◽  
Concrete Column ◽  
Reinforced Concrete Column ◽  
Detailed Simulation ◽  
Solid Finite Elements

Modern software packages for calculating buildings and structures for various types of action make it possible to simulate the structure and its elements in sufficient detail and to reflect adequately the behavior of this structure. However, detailed simulation with the use of solid finite elements requires a large amount of computing time to perform calculations. This problem can be solved by moving from solid finite elements to bar elements. At the same time, it is necessary to verify the bar calculation models. The article compares the calculation results of a reinforced concrete column simulated in two ways: with the use of solid finite elements based on the actual reinforcement and with the use of bar finite elements. The concrete material for the reference model is specified using a Continuous Surface Cap Model nonlinear model implemented in the LS-DYNA software package. This model reflects the non-linear behavior of concrete and enables to consider the joint behavior of concrete and reinforcing bars. The diagrams of concrete behavior in the bar model are adopted in accordance with SP 63.13330.2012 “Concrete and reinforced concrete structures. Revised edition of SP 52-101-2003”. The study compares the results obtained by the breaking load value and the fracture pattern of the column under consideration.

Experimental Studies of Reinforced Concrete Column Capacity Affected by Core Drilling

2010 ◽  
Vol 133-134 ◽  
pp. 1195-1200 ◽  
Author(s):  
Lei Zhu ◽  
Qing Feng Xu ◽  
Xiang Min Li ◽  
Chun Ming Zhu
Keyword(s):  
Reinforced Concrete ◽  
Axial Compression ◽  
Experimental Studies ◽  
Concrete Column ◽  
Reinforced Concrete Column ◽  
Rc Columns ◽  
Core Drilling ◽  
Rc Column ◽  
Compression Failure ◽  
Short Columns

The paper presents the experimental studies of reinforced concrete column (RC column) capacity affected by core drilling. By testing three groups (9 total) of full scale concrete short columns, the experiment demonstrates that the axial compression capacity of RC columns after core drilling is reduced from 5.63% to 22.14% while the ultimate displacement decreases from 1.88% to 26.14%. The behavior of columns is altered from the axial compression failure to a small-eccentricity compression failure. The paper summarizes experiment results, followed by an investigation of the dominant factors, such as column effective cross section, drilling location, drilled hole repairing and reinforcing steels discontinued by drilling, that have impact on RC column capacity. The rationale of capacity variations of RC columns due to core drilling is also investigated.

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