The Compressive Behavior of Horizontally Casted Concrete Filled Steel Tubular Members with Consideration of the Process of Concrete Casting

2011 ◽  
Vol 243-249 ◽  
pp. 45-50
Author(s):  
Wen Bo Sun ◽  
Yi Qun Luo ◽  
Wei Huang
Keyword(s):  
Bearing Capacity ◽  
Slenderness Ratio ◽  
Nonlinear Finite Element ◽  
Compressive Behavior ◽  
Element Analysis ◽  
Calculation Results ◽  
Strain Relationship ◽  
Concrete Casting ◽  
Relationship Of ◽  
The Relationship

Concrete casting effect and the hooping effect of concrete filled tubular members is considered in the study of this paper. Firstly, standard stress-strain relationship of concrete and steel is chosen to simulate others’ test, and meanwhile the calculation results by nonlinear finite element analysis are compared with the results of the test. Then the bearing capacity of horizontally casted concrete filled steel tubular members under axial compression is contrasted among different construction processes. Finally, the effect of slenderness ratio of concrete filled tubular members is studied so as to reveal the relationship between the bearing capacity and slenderness ratio.

Parameter Analysis on Bearing Capacity of Concrete-Filled Square Steel Tubular Column to Steel-Encased Concrete Composite Beam Joint with through Diaphragm

2014 ◽  
Vol 1065-1069 ◽  
pp. 1203-1207
Author(s):  
Yan Lin ◽  
Xue Jun Zhou ◽  
Yu Chen Liu ◽  
Wen Qing Kong
Keyword(s):  
Bearing Capacity ◽  
Composite Beam ◽  
Plastic Hinge ◽  
Nonlinear Finite Element ◽  
Parameter Analysis ◽  
Longitudinal Reinforcement ◽  
Element Analysis ◽  
Obvious Effect ◽  
Axial Compression Ratio ◽  
New Type

A new type of concrete-filled square steel tubular column to steel-encased concrete composite beam joint is proposed. In order to study the influences of parameters on bearing capacity for the joint formed plastic hinge in the beam end, nonlinear finite element analysis under monotonic loading is conducted by software ANSYS. The results show that axial compression ratio has little influence on joint bearing capacity, and with the increasing of it, the bearing capacity is enhanced slightly. The height of U-shape steel has a significant impact on joint bearing capacity, and with the rise of it, the bearing capacity is enhanced obviously. The thickness of U-shape steel has a comparatively obvious effect on joint bearing capacity with certain limits, and with the growth of it, the bearing capacity of the joint is also grown observably. The diameter of longitudinal reinforcement in the flange slab of beam has some effects on joint bearing capacity, and with the improvement of diameter, the bearing capacity is achieved.

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%.

scholarly journals Investigation on shear strain of reinforced concrete membrane panels subjected to pure shear

2019 ◽  
Vol 11 (8) ◽  
pp. 168781401986948
Author(s):  
Je-Pyong Jeong ◽  
Dae-Hung Kang
Keyword(s):  
Reinforced Concrete ◽  
Shear Strain ◽  
Pure Shear ◽  
Failure Criteria ◽  
Principal Compressive Stress ◽  
Strain Relationship ◽  
Trial And Error Method ◽  
Shear Strain Energy ◽  
Relationship Of ◽  
The Relationship

Hsu recently conducted a shear test on nine reinforced concrete panel elements subjected to applying pure shear using a shear testing device. Modern truss models (i.e. modified compression field theory and a rotating angle softened truss model) are used to perform a complex nonlinear analysis through a trial and error method based on a double loop. This analysis is conducted by employing equilibrium conditions, compatibility conditions, and a ductile stress–strain relationship of a reinforced concrete membrane panel in a biaxial state. In this study, an effective algorithm that uses a revised Mohr compatibility method based on the failure criteria of struts and ties is proposed. This algorithm is used to improve the convergence rate in the analysis of shear history, which was performed in the experiment of Hsu. The result of the analysis indicates that the shear strain energy in a state of extended shear strain is influenced by the relationship between principal compressive stress and strain (crushing failure).

A Micro-Fracture Model and its Application in Hardened Cement Paste

2016 ◽  
Vol 25 (2) ◽  
pp. 096369351602500 ◽  
Author(s):  
Kan Jin ◽  
Cao Wei
Keyword(s):  
Porous Media ◽  
Ultimate Strength ◽  
Elastic Properties ◽  
Cement Paste ◽  
Fracture Model ◽  
Hardened Cement ◽  
Average Pore ◽  
Calculation Results ◽  
Strain Relationship ◽  
Relationship Of

A micro-fracture model is presented to investigate mechanics properties of porous media such as cement paste on basis of micromechanics theory and fracture theory. Relationships between mechanics properties of porous media and the parameters of pores such as shape, size, and porosity are analysed by this model. Calculation results show that, to a hypothetic porous media with same porosity, the ultimate strength and elastic properties are reduced with an increase of average pore diameter. Nano-scale pores have little effect on the ultimate strength of this porous media while the micron-scale pores have great effect on it. The stress-strain relationship of this porous media with the micron-scaled pores is nonlinear obviously. The results also show that the ultimate strength and elastic properties of the porous media are reduced with an increase of the porosity and shape parameter. Mechanics properties of a cement paste with water cement ratio of 0.5 are tested. The calculation results from the model are in agreement with the experimental results.

Analysis of Uniaxial Dynamic Performance of Concrete-Filled Square Steel Tube Composite Column

2011 ◽  
Vol 94-96 ◽  
pp. 220-224 ◽  
Author(s):  
Xi Guang Cui ◽  
Hai Dong Xu
Keyword(s):  
Strain Rate ◽  
Bearing Capacity ◽  
Dynamic Performance ◽  
Concrete Strength ◽  
Steel Tube ◽  
Ultimate Bearing Capacity ◽  
Element Analysis ◽  
Compression Performance ◽  
Calculation Results ◽  
Square Steel Tube

Considering the strain rate then puts forward the modified uniaxial dynamic constitutive model related to strain rate in concrete-filled square steel tube and the modified calculation results match well with the experimental results. Based on the above conclusion, uniaxial compression performance finite element analysis with different strain rate among 10-5/s–10-3/s is completed, the results showed that strain rate can obviously change the dynamic performance of the concrete-filled square steel tube. Through the analysis of the influencing factors of the core concrete compressive strength, it is showed that with the increasing of the strain rate and the improving of concrete strength, the ultimate bearing capacity of concrete-filled square steel tube is higher and the ductility is reduced. With the increasing of stirrup ratio, ultimate bearing capacity is greater and the ductility is enhanced. With the sectional dimensions increasing, the ultimate bearing capacity is greater and the ductility is enhanced.

Performance Analysis of CFST Column and RC Column Subjected to Eccentric Load

2011 ◽  
Vol 94-96 ◽  
pp. 805-809
Author(s):  
Yu Yong Fu ◽  
Shu Wang Yan ◽  
Chuang Du
Keyword(s):  
Finite Element ◽  
Performance Analysis ◽  
Bearing Capacity ◽  
Cross Section ◽  
Slenderness Ratio ◽  
Element Model ◽  
Nonlinear Finite Element ◽  
Eccentric Load ◽  
Rc Column ◽  
Nonlinear Finite Element Model

A nonlinear finite element model is developed to study the behavior of square concrete-filled steel tubular(CFST) column and reinforced concrete (RC) column with the same quantity of material and cross-section sizes under eccentric load using ANSYS software.The results indicate that the bearing capacity of CFST column is about 30% greater than RC column and the ductility of CFST column is much greater than RC column under the same conditions. Eccentricity and slenderness ratio have same effect on the bearing capacity of both, which are drop.

Finite Element Analysis of Earthquake Resistance Behaviors of T-Shaped Concrete-Filled Rectangular Composite Steel Tubular Columns

2014 ◽  
Vol 501-504 ◽  
pp. 1633-1638
Author(s):  
Jun Huang ◽  
Yi Chao Zhang ◽  
Shao Bin Dai
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Bearing Capacity ◽  
Fem Analysis ◽  
Nonlinear Finite Element ◽  
Earthquake Resistance ◽  
Element Analysis ◽  
Tubular Columns ◽  
Finite Element Software ◽  
Composite Steel

By using finite element software ABAQUS, the nonlinear finite element analysis of earthquake resistance behavior of T-shaped concrete-filled rectangular composite steel tubular columns is carried out, furthermore, the analysis results and the corresponding experiment results are compared. The results indicate that the calculated value of ultimate bearing capacity is less than the experimental value, and the results of FEM analysis can match the experiment results better, and thus, it can better reflect the earthquake resistance behaviors of the specimens.

Buckling Analysis of Double-Limb Lipped Channel Section Member under Axial Load

2011 ◽  
Vol 243-249 ◽  
pp. 268-273
Author(s):  
Qing Ma ◽  
Jin Song Lei ◽  
Wen Zhi Yin
Keyword(s):  
Bearing Capacity ◽  
Axial Load ◽  
Slenderness Ratio ◽  
Ultimate Bearing Capacity ◽  
Thickness Ratio ◽  
Distortional Buckling ◽  
Element Analysis ◽  
Channel Section ◽  
The Finite Element Analysis ◽  
Breadth Ratio

Double-limb lipped channel section steel member is formed by connecting two single limb members with bolts in order to improve the buckling performance. In order to research the buckling form and ultimate bearing capacity of members with different slenderness ratios under axial load, nonlinear analysis of buckling performance is done to this kind of section using the finite element analysis software ANSYS. The influence on bearing capacity caused by height-breadth ratio of section, height-thickness ratio of web and breadth-thickness ratio of flange is analyzed. The results show that: (1) for larger slenderness ratio, complete buckling occurs to the column mainly and the slenderness ratio has larger influence on buckling bearing capacity, while for smaller slenderness ratio, local distortional buckling occurs more; (2) in a certain range, the increase of height-breadth ratio could raise the ultimate bearing capacity of member, but excessive height-breadth ratio would make the ultimate bearing capacity decrease, (3) the increase of both height-thickness ratio and breadth-thickness ratio would decrease the ultimate bearing capacity.

Experimental Research on Concrete Filled Thin-Walled Steel Tube Long Columns

2008 ◽  
Vol 400-402 ◽  
pp. 551-557 ◽  
Author(s):  
Bao Zhu Cao ◽  
Yao Chun Zhang ◽  
Yue Ming Zhao
Keyword(s):  
Experimental Research ◽  
Local Buckling ◽  
Steel Tube ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Global Buckling ◽  
Thin Walled ◽  
Relationship Of ◽  
The Relationship ◽  
Theoretical Results

Experimental research on square and octagonal concrete filled thin-walled steel tube long columns of 6 specimens in axial compression and 8 specimens in eccentric compression is undertaken. The relationship of global buckling bearing capacity of the columns and local buckling of the steel tubes is obtained. The test indicates that local buckling occurs in steel tube of each column before it reaches ultimate capacity, and has little effect on global buckling performance. The ultimate load decreases obviously with the increase of slender ratio and eccentricity. The ductility of columns increases with the increase of steel ratio in composite sections. Composite beam element of ANSYS is adopted in the finite element analysis. The theoretical results are agreed well with test..

scholarly journals HUBUNGAN PARITAS DENGAN DERAJAT LASERASI JALAN LAHIR DI POLINDES JETIS LOR KECAMATAN NAWANGAN KABUPATEN PACITAN

2019 ◽  
Vol 6 (1) ◽  
pp. 48-53
Author(s):  
Etika Desi Yogi
Keyword(s):  
Correlation Analysis ◽  
Pelvic Floor ◽  
Vaginal Wall ◽  
Labor Process ◽  
Birth Process ◽  
Birth Canal ◽  
Calculation Results ◽  
Independent Variable ◽  
Relationship Of ◽  
The Relationship

For women, the perineum is very important stretching and lubricating the perineum during labor can weaken the pelvic floor muscles in the vaginal wall, trauma to the perineum also causes discomfort and pain during sexual intercourse and an estimated 85% of maternal mothers experience birth canal lacerations (Kettle and Tohil 2008). One of the fears that are often felt by pregnant women, especially third timers, is fear of being torn and afraid of sewing. Especially for mothers who have experienced it, this can make their own trauma when facing the birth process later (USU, 2006). The purpose of this study was to determine the relationship of parity to the degree of laceration of the birth pathway in Jetis Lor Polindes, Nawangan District, Pacitan Regency. The design or design in this study is correlation analysis, with the "retrospective" approach. This study analyzed the relationship of parity with the degree of laceration of the birth path in Jetis Lor Polindes, Nawangan District, Pacitan Regency. In this study, the population was all mothers giving birth at Jetis Lor Polindes, Nawangan District, Pacitan Regency. The samples in this study were all mothers giving birth at Jetis Lor Polindes, Nawangan District, Pacitan Regency. In this study by looking at the last 1 year data. In this study the independent variable is parity. In this study the dependent variable is the degree of laceration of the birth canal. Based on the calculation results of SPSS 11.5 for Windows, it was found that there was no relationship between parity and laceration degrees in the Jetis Lor Polindes, Nawangan Subdistrict, Pacitan Regency, from the results of probability (sig. 2-tailed) 0.22 <0.05.The researcher hopes that the mother will seek information and increase knowledge about the labor process, so that with good knowledge will reduce lacerations on the birth canal

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