Axial compression performance analysis and bearing capacity calculation on square concrete-filled double-tube short columns

2020 ◽  
Vol 72 ◽  
pp. 102775 ◽  
Author(s):  
Junchang Ci ◽  
Shicai Chen ◽  
Hong Jia ◽  
Weiming Yan ◽  
Tianyi Song ◽  
...  
Keyword(s):  
Performance Analysis ◽  
Bearing Capacity ◽  
Axial Compression ◽  
Compression Performance ◽  
Short Columns ◽  
Capacity Calculation

Performance analysis and bearing capacity calculation on circular concrete-filled double steel tubular stub columns under axial compression

Structures ◽  
2020 ◽  
Vol 25 ◽  
pp. 554-565 ◽  
Author(s):  
Junchang Ci ◽  
Hong Jia ◽  
Shicai Chen ◽  
Weiming Yan ◽  
Tianyi Song ◽  
...  
Keyword(s):  
Performance Analysis ◽  
Bearing Capacity ◽  
Axial Compression ◽  
Capacity Calculation ◽  
Stub Columns

scholarly journals Numerical analysis of axial compressive behavior of RC short columns subjected to non-uniform fire: A meso-scale study

2021 ◽  
Vol 272 ◽  
pp. 02028
Author(s):  
Xiaoya Li ◽  
Renbo Zhang ◽  
Liu Jin ◽  
Xiuli Du
Keyword(s):  
Mechanical Properties ◽  
Bearing Capacity ◽  
Axial Compression ◽  
Three Dimensional ◽  
Simulation Method ◽  
Rc Structures ◽  
Compression Performance ◽  
Short Columns ◽  
Steel Bars ◽  
Meso Scale

The bearing capacity and durability of reinforced concrete (RC) structures can be affected by fire. In this study, a three-dimensional (3D) meso-scale simulation model for RC short column subjected to axial compression after exposure to fire was established. The degradation effect of mechanical properties of steel bars and concrete materials after high temperature was taken into account. The bond-slip behavior between longitudinal steel bars and concrete was also considered in the model. Based on the present simulation method, the failure mode and failure mechanism of the RC short columns were investigated. Moreover, the effects of fire scenario and fire duration on the axial compression performance of RC short columns were further investigated. It is found that the meso-scale numerical model can effectively simulate the mechanical behavior of RC short columns under axial load. Moreover, with the increase of fired surfaces and fire duration, the peak bearing capacity, axial compression stiffness and ductility decrease. The mechanical properties of short columns decrease more quickly under non-uniform fire. By comparing the theoretical value with the numerical simulation value of Nut/Nu, it is found that the theoretical value is conservative.

Research of Post-Fire Mechanical Property of Steel Fiber Reinforced Ceramsite Concrete Filled Steel Tubes after Exposure to Fire

2013 ◽  
Vol 790 ◽  
pp. 181-184
Author(s):  
Hai Lun Tong ◽  
Tian Hong Wang ◽  
Jian Qi Lu ◽  
Xin Tang Wang
Keyword(s):  
Bearing Capacity ◽  
Steel Fiber ◽  
Fiber Reinforced ◽  
Fire Load ◽  
Furnace Temperature ◽  
Steel Tubes ◽  
Compression Performance ◽  
Short Columns ◽  
Maximum Value ◽  
Concrete Filled Steel Tubes

The post-fire axial compressive behavior of a set of steel fiber reinforced ceramsite concrete filled steel tubular short columns (noted as SFCC-SSC) was experimentally studied. Effect of the maximum value of fire response temperatures of the specimens and some parameters on the axial compression performance of the specimens was especially discussed. The results show that the surface of the steel tubes after fire presented dark red for 700°Cof furnace temperature and orange red for 900°C, and there was no obvious descending segment in post-fire load-displacement curves of the most specimens subjected to fire load. It was concluded that the axial bearing capacity of the specimens aftersuffering the furnace temperature of 900°C is much less than that of the specimens not subjected to fire load, and the volume of steel fiber of 0.5% of has the greatest effect on post-fire bearing capacity of specimens of SFCC-SSC.

scholarly journals Calculation of Axial Compression Capacity for Square Columns Strengthened with HPFL and BSP

2016 ◽  
Vol 2016 ◽  
pp. 1-11
Author(s):  
Hua Huang ◽  
Kailin Xi ◽  
Yu Zhang ◽  
Jinghui Shi ◽  
Boquan Liu
Keyword(s):  
Bearing Capacity ◽  
Axial Compression ◽  
High Performance ◽  
Reduction Factor ◽  
Steel Plates ◽  
Strength Reduction Factor ◽  
Compression Performance ◽  
Load Carrying ◽  
Calculation Results ◽  
Primary Damage

The load carrying capacity and failure mechanism of 8 square columns strengthened with high-performance ferrocement laminate (HPFL) and bonded steel plates (BSP) were analyzed on the basis of experiments on the axial compression performance of these columns. Results show that the reinforcing layer worked together with the original columns as a whole, and the load-bearing capacity significantly increased. When failure of the strengthened column occurred, the mortar and concrete were crushed and bulged outward in the middle of the columns, the angle bars and longitudinal steel bars buckled, and some stirrups were pulled out. The chamfering of angle bar momentously affected the primary damage of steel strand. The values of the strength reduction factor and pressure effective utilization coefficient of the mortar were suggested. Based on the experiments and existing tests of 35 columns strengthened with HPFL, equations for the axial compression bearing capacity were proposed and all calculation results agreed well with testing results. Therefore, the calculation method could be used in the capacity design of axial compression strengthened columns.

Experimental Study on Axial Compression Performance of Full-Scale Square Columns of Reinforced Concrete Confined by High-Strength Reinforcement Hoops

2012 ◽  
Vol 446-449 ◽  
pp. 981-988
Author(s):  
Zhen Bao Li ◽  
Wen Jing Wang ◽  
Wei Jing Zhang ◽  
Yun Da Shao ◽  
Bing Zhang ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Yield Strength ◽  
Bearing Capacity ◽  
Axial Compression ◽  
High Strength Steel ◽  
High Strength ◽  
Concrete Columns ◽  
Full Scale ◽  
Compression Performance ◽  
Deformation Ability

Axial compression experiments of four full-scale reinforced concrete columns of two groups were carried out. One group of three columns used high-strength steel with the yield strength of 1000MPa as reinforcement hoops, and the second group used the ordinary-strength steel with yield strength of 400MPa. The axial compressive performances between these two groups were assessed. Compared to the specimen using the ordinary-strength steel, the axial compressive bearing capacity of using the high strength steel dose not increase significantly, while the deformation ability increases greatly. The results also indicate that the stress redistributions of the hoops and the concrete sections are obvious, and long-lasting when specimens achieve the ultimate bearing capacity after the yield of the rebar and local damage of concrete materials, at this time the strain of the specimens developes a lot, especially stress - strain curves of speciments with high-strength hoop all show a wide and flat top.

Research of Compression Bearing Capacity of Steel Reinforced Concrete Short Column Replaced by C-BAR

2013 ◽  
Vol 438-439 ◽  
pp. 519-521
Author(s):  
Cheng Zhu Qiu
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Axial Compression ◽  
Steel Reinforced Concrete ◽  
Short Column ◽  
Reinforcing Bar ◽  
Short Columns

t is essential to study the performance of reinforced concrete short column. In this paper, the main reinforcements and hoopings in short columns were replaced by C-BAR reinforcements, the regularity of reinforcing bar replaced by C-BAR reinforcements was summarized. The results show that the axial compression bearing capacity of concrete short column is increased.

Axial Compression Performance Research of RPC Filled Steel Tube Columns Based on the Unified Strength Theory

2013 ◽  
Vol 351-352 ◽  
pp. 337-341
Author(s):  
Qian Zhu ◽  
Jun Hai Zhao ◽  
Yan Li ◽  
Peng Wu ◽  
Su Wang
Keyword(s):  
Bearing Capacity ◽  
Axial Compression ◽  
Engineering Application ◽  
Steel Tube ◽  
Strength Theory ◽  
Unified Strength Theory ◽  
Bond Slip ◽  
Compression Performance ◽  
Performance Research ◽  
Good Agreement

With consideration of the intermediate principal stress,the calculation formula of bearing capacity of RPC filled steel tube columns under axial compression is deduced based on the twin shear unified strength theory. Combining with the bond-slip theory,new ultimate bearing capacity formula is derived with the highest regard for bond stress. Compared with the theoretical result and the experimental data,good agreement can be found. The results show that unified strength theory and the bond-slip theory are versatile in theoretical analysis of the column. The analysis results can be provided for the optimum design of RPC filled steel tube and the solution has an important practical value for engineering application.

Study on Load-Bearing Characteristics of Double Layer Stirrup Confined Concrete Square Columns

2011 ◽  
Vol 243-249 ◽  
pp. 1466-1476
Author(s):  
Lin Zhu Sun ◽  
Fang Yang ◽  
Ya Gang Zhou ◽  
Zi Ling Xie
Keyword(s):  
Bearing Capacity ◽  
Axial Compression ◽  
Double Layer ◽  
Concrete Columns ◽  
Confined Concrete ◽  
The Core ◽  
Capacity Calculation ◽  
Strength And Deformation ◽  
Compression Characteristics ◽  
Core Concrete

Double layer stirrup confined concrete columns use two layers of stirrup, inside and outside, to constrain the core concrete. In this paper, in order to analyze the effect of double layer stirrups on the axial compression characteristics of concrete square columns, to determine the strength and deformation characteristics of double layer stirrup confined concrete square columns, and to establish the bearing capacity calculation equation for double layer stirrup confined concrete square columns, we designed 16 specimens to conduct axial compression test, from which a series of test data were obtained for double layer stirrup confined concrete square columns. We built the bearing capacity calculation equation for double layer stirrup confined concrete components on the basis of analysis and study and compared the calculated values with the test ones, and these data fit well; therefore, the study can provide reference for design and application of double layer stirrup confined concrete square columns.

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