Calculation Method Investigation on Jacketing Reinforcement of RC Eccentric Compressive Column Subjected to Fire

2012 ◽  
Vol 166-169 ◽  
pp. 1548-1553
Author(s):  
Jin Jun Guo ◽  
Yan Lu ◽  
Ping Xian Li
Keyword(s):  
Reinforced Concrete ◽  
Temperature Distribution ◽  
Calculation Method ◽  
Load Capacity ◽  
Concrete Column ◽  
Compressive Failure ◽  
Reinforced Concrete Column ◽  
Rc Column ◽  
Column Section ◽  
Reinforcement Design

Based on eccentric compressive experiments of reinforced concrete column strengthened with jacketing method, the paper calculated and analyzed jacketing reinforcement of RC eccentric compressive column subjected to fire. The calculation procedure of residual load capacity of compressive member after fire was put forward according to temperature distribution at column section. To distinguish tensile or compressive failure of RC column, the formulas of relative balanced depth of compressive zone of jacketing section were deduced as well as the corresponding applied calculation method of norm section load capacity was presented under the second loaded stage. In addition, the reinforcement design and construction of one fire damaged building was conducted in terms of this paper’s method. The good running status of strengthened columns for many years validates the applicability of this method.

scholarly journals Construction of Uniaxial Interaction Diagram for Slender Reinforced Concrete Column Based on Nonlinear Finite Element Analysis

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Bedaso Ahmed ◽  
Kefiyalew Zerfu ◽  
Elmer C. Agon
Keyword(s):  
Finite Element Analysis ◽  
Reinforced Concrete ◽  
Slenderness Ratio ◽  
Nonlinear Finite Element ◽  
Concrete Column ◽  
Reinforced Concrete Column ◽  
Element Analysis ◽  
Interaction Diagram ◽  
Order Analysis ◽  
Rc Column

Slender reinforced concrete column may fail in material failure or instability failure. Instability failure is a common problem which cannot be analyzed with first-order analysis. So, second-order analysis is required to analyze instability failure of slender RC column. The main objective of this study was to construct uniaxial interaction diagram for slender reinforced concrete column based on nonlinear finite element analysis (FEA) software. The key parameters which were studied in this study were eccentricity, slenderness ratio, steel ratio, and shape of the column. Concrete damage plasticity (CDP) was utilized in modeling the concrete. Material nonlinearity, geometric nonlinearity, effect of cracking, and tension stiffening effect were included in the modeling. The results reveal that, as slenderness ratio increases, the balanced moment also increases, but the corresponding axial load was decreased. However, increasing the amount of steel reinforcement to the column increases the stability of the column and reduces the effect of slenderness ratio. Also, the capacity of square slender RC column is larger than rectangular slender RC column with equivalent cross section. However, the result is close to each other as slenderness ratio increased. Finally, validation was conducted by taking a benchmark experiment, and it shows that FEA result agrees with the experimental by 85.581%.

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 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.

Evaluation for RC Column Confined Partially with Externally FRP Wrapping Sheet Using Nonlinear FE Analysis

2019 ◽  
Vol 972 ◽  
pp. 129-133
Author(s):  
Yasmeen Taleb Obaidat
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Finite Element Model ◽  
Load Capacity ◽  
Element Model ◽  
Material Behavior ◽  
Nonlinear Material ◽  
Concrete Column ◽  
Reinforced Concrete Column ◽  
Number Of Layers

Little research has been carried out in validating, fiber reinforced polymer (FRP) concrete strengthened column and the effective using partial wrapping. Also the effect of several parameter on strengthen column using the partial wrapping sheet of desired width and thickness around column have not been found out. To this end, a nonlinear 3D finite element model has been developed in current study for CFRP strengthened reinforced concrete column to simulate the behavior accompanied by the effect of partial wrapping with emphasis on load capacity and failure mode. The finite element simulation of CFRP strengthened RC columns is performed using commercial finite element program ABAQUS. Modelling was conducted on reinforced concrete columns with dimensions of 160 x 250 x 960 mm. The finite element model incorporates the nonlinear material behavior of concrete, bilinear stress-strain curve of steel and linear elastic behavior of CFRP material. The concrete was modeled using a plastic damage model. The performance of the FE model was studied by simulating experimental columns from the literature. The load, and strain of CFRP obtained from the FE study were compared with the corresponding experimental results. The FEM results agreed well with the experiments. In addition, to enhance our understanding of the behavior of strengthened reinforced concrete column capacity using partial wrapping the effect of changing the spacing between the CFRP sheets and number of layers were examined. The increase number of layers and decrease spacing give a higher ultimate load capacity, and delay the failure.

Nonlinear Analysis of Shear Performance for Joint of Steel Reinforced Concrete Beam and Angle-Steel Concrete Column

2012 ◽  
Vol 256-259 ◽  
pp. 674-679
Author(s):  
Kun Wang ◽  
Shi Yun Xu ◽  
Hui Hui Luo
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Shear Capacity ◽  
Concrete Column ◽  
Reinforced Concrete Column ◽  
Steel Reinforced Concrete ◽  
Rc Column ◽  
Shear Performance ◽  
Angle Steel

Based on the simulated results of joint of SRC beam and RC column (steel reinforced concrete beam and reinforced concrete column) with steel anchor, an analytical research on failure models and shear performance of three types of joints is conducted, which is composed of SRC beam and RC column, of SRC beam and column (steel reinforced concrete beam and column) and of SRC beam and ASC column (steel reinforced concrete beam and angle-steel concrete column). Then the parameters analysis for joint of SRC beam and ASC column is carried out, and the design formula of shear capacity for joint of SRC beam and ASC column is given on account of a great number of calculated and statistic results.

Experimental Study on Axial-Compression Reinforced Concrete Column Strengthened by Circular Steel Tube

2011 ◽  
Vol 94-96 ◽  
pp. 1261-1270 ◽  
Author(s):  
Mei Hua Wang
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Axial Compression ◽  
Work Performance ◽  
Load Capacity ◽  
Steel Tube ◽  
Concrete Column ◽  
Reinforced Concrete Column ◽  
Circular Steel Tube ◽  
Core Column

In the case of small increase of cross-section, concrete column strengthened by circular steel tube can increase the bearing capacity greatly as well as ductility. This has resulted in engineering welcome. This paper studied the common work performance of reinforced concrete column strengthened by circular steel tube in three different conditions test of axial compression. The results show that outsourcing steel and core column can be achieved interaction. By strengthening, it can improve the load capacity of the concrete column as well as ductility. With the increase in initial load, although it has little effect on the bearing capacity of reinforced columns, it can affect the ductility to some extent. This paper can provide experimental basis for engineering applications.

The Damage Assessment of Reinforced Concrete Column under Blast and Loading of Certain Type Rocket Projectile

2014 ◽  
Vol 633-634 ◽  
pp. 947-951
Author(s):  
Peng Fei Zhang ◽  
Feng Ping Zhou ◽  
Zhong Qing Shen
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Reinforced Concrete ◽  
Numerical Method ◽  
Damage Assessment ◽  
Concrete Column ◽  
Analysis Model ◽  
Reinforced Concrete Column ◽  
Element Analysis ◽  
Rc Column

The new damage assessment criteria of reinforced concrete column was analyzed and defined in the paper. RC column finite element analysis model was established, then damage patterns of the explosion impact on RC column are obtained by means of numerical simulation. The P-I curve of RC column is ascertained. Based on damage criteria and finite element analysis result, we put forward a simplified numerical method to ascertain RC column P-I curve. By contrast, the applicability and validity of simplified numerical method is satisfactory.

scholarly journals Effect of Reinforced Concrete Jacketing on Axial Load Capacity of Reinforced Concrete Column

2020 ◽  
Vol 6 (7) ◽  
pp. 1266-1272
Author(s):  
Praveen Anand ◽  
Ajay Kumar Sinha
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Load Capacity ◽  
Concrete Surface ◽  
Structural Element ◽  
Reinforced Concrete Column ◽  
Rc Column ◽  
Finite Element Software ◽  
Design Values ◽  
Abaqus Software

Whenever a member of a structure becomes structurally deficient, it becomes vulnerable to the existing load and for the additional loads that it may be subjected to in the coming future. Since columns are the most important structural element, the structural retrofit of columns, relative to other structural elements is of prime importance. This study intends to investigate the performance and behaviour of an RC column jacketed with Reinforced Concrete columns under axial loads. The objective of this paper is to find out the efficiency of RC jacket in enhancing the strength of an existing RC column. A mathematical design based upon Indian Standards codes has been designed to identify the behaviour of jacketed RC columns. This has been followed by a finite element based numerical simulation using the same material properties as used in the process of designing. The simulation has been done in ABAQUS software with appropriate contact modelling. The analytical model considers that there is no bond slippage between the existing and new concrete surface i.e. the bond between the existing and new concrete is assumed to be perfect. This perfect bond between the surfaces has been modelled by using appropriate constraints in ABAQUS software. The finite element models show fair agreement with the designed values in terms of ultimate capacity and failure mode. The load bearing capacity enhancement of the RC jacketed column has been found to increase substantially. The enhancement capacity results obtained from the finite element software differs about 16-25% from the design values.

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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