scholarly journals Comparison of Stress-Strain Relationship for Confined Concrete Using Two-Dimensional Fiber-Based Cross-Sectional Analysis

2021 ◽  
Vol 4 (2) ◽  
pp. 93
Author(s):  
Nia Dwi Puspitasari ◽  
Aulia Dewi Fatikasari
Keyword(s):  
Experimental Data ◽  
Reinforced Concrete ◽  
Constitutive Model ◽  
Concrete Column ◽  
Two Dimensional ◽  
Reinforced Concrete Column ◽  
Stress Strain ◽  
Cross Sectional ◽  
Strain Relationship ◽  
Sectional Analysis

Stress-strain relationship is the main parameter to identify the strength, ductility and behavior of the structure. Various constitutive models were created in order to simplify the analytical approach of concrete behavior. In this paper, the behavior of reinforced concrete column is modeled using Attard and Setunge�s (1996) and Mander�s (1988) stress-strain constitutive model. The appropriate model for reinforced concrete column was determined based on the existing experimental data. Two-dimensional simulation of reinforced concrete column using fiber-based cross-sectional analysis in MATLAB is sighted. And the performance of the reinforced concrete column from the experimental data is compared with the analysis result from the simulation. There are two comparation methods used in this research. The first method is to compare the linear regression with the reference line. The smallest degree between the linear regression and the referrence line is expected. The second method is to compare the Root Mean Square Defiation (RMSD) value. The smallest RMSD value is expected to get the most suitable constitutive model compared to the experimental data. From the computational process, it was found that Mander�s Constitutive model is preferaed to be used in further analysis problem concerning reinforced concrete column

A self-locking steel bearing connection for circular reinforced concrete columns

2019 ◽  
Vol 22 (12) ◽  
pp. 2605-2619
Author(s):  
Denghu Jing ◽  
Shuangyin Cao ◽  
Theofanis Krevaikas ◽  
Jun Bian
Keyword(s):  
Reinforced Concrete ◽  
Cross Sections ◽  
Axial Loading ◽  
High Strength ◽  
Axial Stiffness ◽  
Concrete Column ◽  
Reinforced Concrete Column ◽  
Cross Sectional ◽  
Locking Mechanism ◽  
The Cross

This article proposes a new connection between a steel bearing and a reinforced concrete column, which is mainly used for provisionally providing jack support in existing reinforced concrete structures. In this suggested connection joint, the steel bearing consisted of two or four symmetrical components assembled by high-strength bolts, which surrounds the reinforced concrete column by a tapered tube and balances the vertical load via the friction force between the tapered tube and concrete, that is, through a self-locking mechanism. The proposed connection joint can be assembled easily at a construction site and can also be disassembled and reused many times. To demonstrate the feasibility of this type of connection joint, a simple test was conducted to illustrate the concept, that is, a total of four medium-scale steel bearing–reinforced concrete column connections with circular cross sections were fabricated and tested under axial loading. The test results showed that the steel bearing–reinforced concrete column connection based on self-locking mechanism exhibited good working performance. Furthermore, a simplified formula to predict the axial stiffness of the connection joint was presented. From the tests and the proposed formula, the most important factors that influence the axial stiffness of this type of connection joint on the premise of an elastic working state are the slope of the tapered tube, the height of the steel bearing, the thickness of the tapered tube, the cross section of the reinforced concrete column, the cross-sectional area of all the connecting bolts, the proportion of the number of top bolts, the area of the top ring plate, and the effective contact area ratio.

scholarly journals BUCKLING LOAD OF RC COLUMNS EXPOSED TO ISO FIRE LOAD, The influence of the cross-sectional dimensions

2016 ◽  
Author(s):  
Urška Bajc ◽  
Miran Saje ◽  
Tomaž Hozjan ◽  
Igor Planinc ◽  
Sebastjan Bratina
Keyword(s):  
Reinforced Concrete ◽  
Elevated Temperatures ◽  
Load Capacity ◽  
Buckling Load ◽  
Concrete Column ◽  
Mechanical And Thermal Properties ◽  
Fire Load ◽  
Reinforced Concrete Column ◽  
Cross Sectional ◽  
The Cross

The influence of the cross-sectional dimensions on the buckling load capacity of reinforced concrete column exposed to ISO fire load is presented. The fire analysis is divided in two separate phases. In the first phase, the calculation of the temperatures over the cross-section of the concrete column is performed. Here more advanced hygro-thermal analysis is executed to take into account the influence of moisture on the distribution of the temperatures. In the second step of the fire analysis, the mechanical analysis is performed. The mechanical and thermal properties of concrete and reinforcement at elevated temperatures are used in accordance with EN 1992-1-2 (2004). For two different cross-sections, the parametric study has been performed. The critical buckling time and critical buckling capacity as a function of a load and slenderness of reinforced concrete column have been determined.

Mechanical Behavior of FRP-Confined Rectangular Concrete Column

2010 ◽  
Vol 163-167 ◽  
pp. 3804-3807
Author(s):  
Ping Wu ◽  
Feng Yu
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Cross Section ◽  
Strain Softening ◽  
Axial Strain ◽  
Concrete Column ◽  
Stress Strain ◽  
Strain Relationship ◽  
Rectangular Concrete Column ◽  
Strain Model

According to the analysis of existing experimental data, it is well known that the behavior of FRP-confined rectangular concrete column were mainly related to the cross section coefficient of concrete, the confinement effect coefficient and the strength of concrete. Based on experimental study and theoretical analysis, the formula for bearing capacity and ultimate axial strain of FRP-confined rectangular concrete column were proposed, and the stress-strain model with strain-hardening components or strain-softening components. The effects of every parameter on the stress-strain relationship were carefully considered. The predictions of the model agree well with test data.

scholarly journals Harmonic dynamic loading response of reinforced concrete column

2018 ◽  
Vol 162 ◽  
pp. 04024
Author(s):  
Saba Sabih
Keyword(s):  
Reinforced Concrete ◽  
Power Systems ◽  
Electrical Power ◽  
Three Dimensions ◽  
Concrete Column ◽  
Structural Element ◽  
Reinforced Concrete Column ◽  
Cross Sectional ◽  
Analysis And Design ◽  
Strength Capacity

A reinforced concrete column is classified as compression structural element mostly analyzed and designed due to the applied combinations of dead and live loading with other considered loadings. Industries of considerable or relatively great size, production and electrical utilities are very concerned about the presence of dynamic loads in their electrical power systems. This behavior provides current with different components that are multiples of the fundamental frequency of the system which are called harmonics. Reinforced concrete elements such as column must be checked for the strength capacity and the response due to applied harmonic loading after completed the static analysis and design. In present article evaluations of reinforced concrete columns under the effects of dynamic harmonic loadings are studied. The main parameters are the reinforcement ratio and harmonic ranged loadings. Finite elements approach was adopted to analyze the columns by ANSYS software and all models are simulated in three dimensions. The analysis results indicated that the square cross sections with that rectangular of the same cross sectional area are closed in performance against static and dynamic loadings.

Experimental Research on the Effects of Reinforcement Ratio on Axial Compression Properties of FRP Reinforced Concrete Column

2012 ◽  
Vol 193-194 ◽  
pp. 721-726
Author(s):  
Yun Feng Zhang ◽  
Zhong Liang Lv ◽  
De Wang Zhao
Keyword(s):  
Experimental Data ◽  
Reinforced Concrete ◽  
Axial Compression ◽  
Concrete Columns ◽  
Reinforcement Ratio ◽  
Concrete Column ◽  
Reinforced Concrete Column ◽  
Compression Properties ◽  
Frp Tubes ◽  
Axial Compression Experiment

Through the axial compression experiment of 11 FRP reinforced concrete columns, this paper analyzes the failure mode and loading-strain curves.Comparison between the experimental data with FRP reinforced concrete and the calculated value without FRP reinforced concrete is done. The results show that the reinforcement for the component will increase ductility and ultimate bearing capacity of the composite column, but the increase of reinforcement ratio will also reduce confining ability of FRP tubes.

DETERMINATION OF THE AREA OF REINFORCEMENT OF REINFORCED CONCRETE COLUMNS OF CIRCULAR CROSS SECTION

2018 ◽  
Vol 8 (3) ◽  
pp. 8-11
Author(s):  
Nikolay A. ILYIN ◽  
Sergey S. MORDOVSKY ◽  
Ekaterina Ye. VASILYEVA ◽  
Valeriya N. TALANOVA
Keyword(s):  
Reinforced Concrete ◽  
Cross Section ◽  
Circular Cross Section ◽  
Mathematical Expression ◽  
Concrete Columns ◽  
Concrete Column ◽  
Longitudinal Reinforcement ◽  
Sectional Area ◽  
Reinforced Concrete Column ◽  
Cross Sectional

A mathematical expression has been developed for determining the cross-sectional area of reinforcement of an eccentrically compressed reinforced concrete column of circular cross section, which makes it possible to simplify consideration of the infl uence of structural indicators and quality parameters of reinforcement and concrete on the required area of longitudinal reinforcement of reinforced concrete column. An example of using this formula in the calculation is shown. This mathematical expression can be used in the design of reinforced concrete columns, racks of power lines and circular supports as the least time-consuming method of engineering calculation, allowing to determine the cross-sectional area of longitudinal reinforcement.

scholarly journals Modeling and Analysis of the Effect of Holes in Reinforced Concrete Column Structures

2020 ◽  
Vol 6 (1) ◽  
pp. 27
Author(s):  
Yohanes Laka Suku ◽  
Kristoforus Je
Keyword(s):  
Reinforced Concrete ◽  
Cross Section ◽  
Maximum Load ◽  
Cross Sectional Area ◽  
Frame Structure ◽  
Experimental Result ◽  
Concrete Column ◽  
Sectional Area ◽  
Reinforced Concrete Column ◽  
Cross Sectional

Holes are often made inside the column structure for plumbing, mechanical, and electrical installation purposes may affect the structural performance of the column. Therefore, this paper aims to model and analyze the effect of holes in reinforced concrete column structures due to lateral loads. Data were obtained from the reference frame structure of the previous researcher, with varying centric column holes of 0%, 2%, 4%, 6%, 8%, 10%, and 12%, respectively to the column cross-sectional area. Furthermore, a hole with a ratio of 4% to the column cross-sectional area was placed at 5 and 10 mm eccentric to the center of column cross-section to examine the influence of holes position in the perforated column. The frame structure was modelled and analyzed by Finite Element (FE) using ABAQUS software. The result showed that the maximum load, displacement, and crack pattern resulted from the model is close to the experimental result. The results of the analysis showed that with the hole size of 2% to 12% of the column cross-sectional area, the frame strength was reduced by 5.43% to 15.56%.  The frame strength was also reduced by 2.77% and 6.14% when the hole placed 5mm and 10 mm eccentric to the center of the column cross-section area. The displacement of the frame also decreases by 59.63% to 74.60% when the holes with the ratio of 2% to 12% to the column cross-sectional area exist in the column. The existence of eccentric holes on the column reduced the performance of the frame structure, by decreasing its strength, displacement and ductility.

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