Analysis on Bearing Capacity of Concrete-Filled Tubular CFRP-Steel Stub Column under Axle Compression

2014 ◽  
Vol 584-586 ◽  
pp. 1155-1160
Author(s):  
Rong Zhou ◽  
Jun Hai Zhao ◽  
Xue Ying Wei
Keyword(s):  
Engineering Application ◽  
Friction Angle ◽  
Steel Tube ◽  
Axial Loads ◽  
Strength Theory ◽  
Theory Analysis ◽  
Unified Strength Theory ◽  
Load Calculation ◽  
Stub Column ◽  
Good Agreement

New progress of research and applications of CFRP at home and abroad are introduced in this paper. The circular concrete-filled tubular CFRP-steel stub column under axial loads is studied based on the unified strength theory in the paper. The effect of intermediate principal stress on the ultimate strength for the concrete-filled tubular CFRP-steel stub column have been investigated. The ultimate load calculation formula for the concrete-filled tubular CFRP-steel stub column is derived in this paper, and can be simplified for cases without CFRP. Compared with the solution obtained in this paper and the experimental results, the good agreement can be found. The effects of the intermediate shear stress, the cross-section deformation ratio and also the inner friction angle of the concrete are all considered in the theory analysis. The analysis result further tests the applicability of the unified strength theory in the field of concrete-filled CFRP-steel tube. It has an important theory value for engineering application.

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.

Axial Strength of Concrete-Filled Square Steel Tubular Columns Reinforced by Inner Circular Steel Tube

2010 ◽  
Vol 163-167 ◽  
pp. 4542-4545 ◽  
Author(s):  
Xin Zhong Li ◽  
Xue Ying Wei ◽  
Jun Hai Zhao
Keyword(s):  
Experimental Investigation ◽  
Steel Tube ◽  
Experimental Results ◽  
Test Results ◽  
Strength Theory ◽  
Unified Strength Theory ◽  
Axial Strength ◽  
Tubular Columns ◽  
Circular Steel Tube ◽  
Good Agreement

This paper presents the theoretical and experimental results of concrete-filled steel tube columns subjected to axially compression. A total of 6 specimens with outer square sections reinforced by inner cicular steel tube were constructed for experimental investigation. The ultimate strengths of the columns from tests were obtained. The theoretical strengths of the columns were also investigated based on unified strength theory, and compared with the test results. Good agreement can be observed from the comparison.

Study on Ultimate Bearing Capacity of Reinforced Concrete Columns Combined with FRP

2011 ◽  
Vol 94-96 ◽  
pp. 820-825
Author(s):  
Sai Wu ◽  
Jun Hai Zhao ◽  
Xue Ying Wei
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Concrete Columns ◽  
Ultimate Bearing Capacity ◽  
Axial Loads ◽  
Strength Theory ◽  
Rc Columns ◽  
Reinforced Concrete Columns ◽  
Unified Strength Theory ◽  
Good Agreement

This paper based on the unified strength theory, analyzed the ultimate bearing capacity of the reinforced concrete columns combined with FRP under axial loads. First, analyzed the mechanical property of the RC columns combined with FRP. Second, based on the unified strength theory, deduced the three-direction compressive stress of the core concrete and got the unified formula for calculating the ultimate bearing capacity of RC columns combined with FRP. Last, compared the analytical results obtained in this paper with the relevant experimental data, good agreement can be found and it proved the good applicability of the formula. Comparing with other methods in calculating the ultimate bearing capacity of RC columns combined with FRP，this method is well-founded, so it has a significant value in analysis of RC columns combined with FRP.

Ultimate Bearing Capacity Analysis of Axially Compressive Circular Steel Tube Columns Filled with Bar-Reinforced Concrete

2011 ◽  
Vol 94-96 ◽  
pp. 1205-1210
Author(s):  
Zhao Liu ◽  
Jun Hai Zhao
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Steel Tube ◽  
Ultimate Bearing Capacity ◽  
Strength Theory ◽  
Principal Stresses ◽  
Unified Strength Theory ◽  
Short Columns ◽  
Circular Steel Tube ◽  
Circular Bar

The mechanical behavior and ultimate bearing capacity of the circular bar-reinforced concrete filled steel tube (BRCFST) short columns under axial compression are analyzed in this paper based on the unified strength theory. Considering the restriction effect of steel tube and hoop bar on concrete, the calculation formula of bearing capacity of the column is deduced. Parametric studies are carried out to evaluate the effects of intermediate principal stresses, diameter-thickness ratio of steel tube and the stirrup ratio on the bearing capacity of the column. A good agreement is reached by comparing the results calculated by the formula with the test results. It is concluded that the unified strength theory is applicable in the theoretical analyses of the BRCFST columns.

Study on the Axial Ultimate Bearing Capacity of Concrete-Filled Square Steel Tubular Stub Columns

2013 ◽  
Vol 690-693 ◽  
pp. 742-746
Author(s):  
Peng Wu ◽  
Jian Feng Xu ◽  
Jun Hai Zhao ◽  
Qian Zhu ◽  
Su Wang
Keyword(s):  
Experimental Data ◽  
Bearing Capacity ◽  
Steel Tube ◽  
Ultimate Bearing Capacity ◽  
Strength Theory ◽  
Constraint Effect ◽  
Unified Strength Theory ◽  
Square Steel Tube ◽  
Core Concrete ◽  
Stub Columns

Based on unified strength theory, the mechanical behavior of core-concrete of concrete-filled square steel tubular stub columns was analyzed. Through controlling the constraint effect between square steel tube and core-concrete by width-thickness ratio, the ultimate bearing capacity formula for concrete-filled square steel tubular stub columns under axial compression was proposed, and the influencing factors of which was also discussed. The rationality of proposed formula was proved from the comparison of the analytical results obtained in this paper and experimental data.

Load-Bearing Capacity of CFDST Based on the Unified Strength Theory

2012 ◽  
Vol 204-208 ◽  
pp. 4031-4037
Author(s):  
Gui Yun Xia ◽  
Jia Jun Li ◽  
Mei Liang Yang
Keyword(s):  
Bearing Capacity ◽  
Steel Tube ◽  
Strength Theory ◽  
Load Bearing Capacity ◽  
Unified Strength Theory ◽  
Load Bearing

Based on the unified strength theory presented by Maohong Yu, the calculating formula for the load-bearing capacity of concrete-filled double steel tube was derived. Through tests, the calculating load-bearing capacity results were compared with testing results, which agreed well. The change of load-bearing capacities with parameter k of the unified strength theory was discussed. It can be drawn that the load-bearing capacity of CFDST will increase with the increase of parameter b, but the increase is not obvious.

Finite Cylindrical Cavity Expansion Model for Penetration of Steel-Tube-Confined Concrete Targets

2014 ◽  
Vol 1065-1069 ◽  
pp. 1065-1068
Author(s):  
Yang Yue Ye Cao ◽  
Zhi Gang Jiang ◽  
Qing Hua Tan
Keyword(s):  
Cylindrical Cavity ◽  
Steel Tube ◽  
Confined Concrete ◽  
Cavity Expansion ◽  
Strength Theory ◽  
Expansion Process ◽  
Cylindrical Cavity Expansion ◽  
Expansion Model ◽  
Better Than ◽  
Good Agreement

Concrete is a brittle material which cracks under the tension and pulverized when the compressive stress exceeds the ultimate compressive strength. Confined concrete performs better than that of concrete without confinement in resisting penetration. Based on the Griffith strength theory, a quasi-static cylindrical cavity expansion model for the penetration of steel-tube-confined concrete targets is proposed. Numerical results show that ratio of tube wall thickness to tube radius significantly effects cavity expansion stress, which is in proportion to the former ratio. The results are in good agreement with the cavity expansion process.

The Study of the Axial Compressive Bearing Capacity of Core Column with High Strength Concrete Filled Steel Tube Based on the Twin Shear Unified Strength Theory

2013 ◽  
Vol 634-638 ◽  
pp. 2752-2756 ◽  
Author(s):  
Qing Yun Ge ◽  
Cai Mei Li ◽  
Fu Lian Yang ◽  
Feng Yan Qin
Keyword(s):  
Bearing Capacity ◽  
High Strength Concrete ◽  
High Strength ◽  
Steel Tube ◽  
Theoretical Formula ◽  
Strength Theory ◽  
Unified Strength Theory ◽  
Concrete Filled Steel Tube ◽  
Strength Concrete ◽  
Core Column

Based on the twin shear unified strength theory, considering the impact of the intermediate principal stress σ2 and the different effects of material’ tensile and compressive properties, this paper deduced the axial compressive bearing capacity formula of core column with high strength concrete filled steel tube. Compared the results of the paper with the test, both coincide in good condition. The results show the validity of the formula. The theoretical formula provides a theoretical basis in the project application and design on the core column with high strength concrete filled steel tube.

A Nonlinear Constitutive Model for Soil under Complex Stress State

2013 ◽  
Vol 535-536 ◽  
pp. 561-564 ◽  
Author(s):  
Hang Zhou Li ◽  
Hong Jian Liao ◽  
Bo Han ◽  
Li Song
Keyword(s):  
Constitutive Model ◽  
Principal Stress ◽  
Friction Angle ◽  
Complex Stress ◽  
Complex Stress State ◽  
Intermediate Principal Stress ◽  
Strength Theory ◽  
Unified Strength Theory ◽  
Strain Behavior ◽  
Chang Model

It is fundamental to predict the stress-strain behavior of soils to control the stability of the geotechnical engineering. A Duncan-Chang constitutive model is analyzed and found that it ignores the effect of the intermediate principal stress. A unified strength theory is investigated and revised. The lode parameter is introduced into the unified strength theory. The unified friction angle and cohesion which may reflect the influence of the intermediate principal stress and verified by the polyaxial tests are obtained. The compressive strength revised from the unified strength theory is used to replace the Mohr-Coulomb criterion and introduced into the Duncan-Chang model. A modified constitutive model is proposed, which is verified by the plane strain tests. The result shows that the modified constitutive can reflect the effect of the intermediate principal stress, and the Duncan-Chang model is a special case of the modified model when b=0.

The Analysis of Punching Shear Strength for Concrete Slabs Based on the Unified Strength Theory

2014 ◽  
Vol 919-921 ◽  
pp. 1853-1859
Author(s):  
Ju Hong Han ◽  
Dun Bin Wang
Keyword(s):  
Shear Strength ◽  
Concrete Slab ◽  
Punching Shear ◽  
Theoretical Formula ◽  
Concrete Slabs ◽  
Strength Theory ◽  
Rigid Plastic ◽  
Unified Strength Theory ◽  
Reinforced Concrete Slabs ◽  
Good Agreement

Based on the mechanism of punching shear and patterns of failure of Specimen,using the unified strength theory and rigid-plastic models,the punching strength of reinforced concrete slabs supported on four sides is obtained.The theoretical formula of punching shear strength for concrete slab is given.The calculated results are in good agreement with the experimental results.

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