Behavior of geopolymer concrete‐filled circular steel tube members

ce/papers ◽  
2021 ◽  
Vol 4 (2-4) ◽  
pp. 593-597
Author(s):  
Han Fang ◽  
Phillip Visintin
Keyword(s):  
Steel Tube ◽  
Geopolymer Concrete ◽  
Circular Steel Tube

Experimental study on circular steel tube-confined reinforced UHPC columns under axial loading

2021 ◽  
Vol 230 ◽  
pp. 111599
Author(s):  
Jiangang Wei ◽  
Zhitao Xie ◽  
Wei Zhang ◽  
Xia Luo ◽  
Yan Yang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Axial Loading ◽  
Steel Tube ◽  
Circular Steel Tube

scholarly journals Seismic Performance of Recycled Concrete Filled Circular Steel Tube Columns

2020 ◽  
Vol 7 ◽  
Author(s):  
Dingyi Xu ◽  
Zongping Chen ◽  
Chunheng Zhou
Keyword(s):  
Seismic Performance ◽  
Coarse Aggregate ◽  
Slenderness Ratio ◽  
Steel Tube ◽  
Recycled Concrete ◽  
Load Range ◽  
Equivalent Viscous Damping ◽  
Displacement Ductility ◽  
Recycled Coarse Aggregate ◽  
Circular Steel Tube

This study was conducted to experimentally investigate the behavior of recycled concrete-filled circular steel tube (RCFST) columns subjected to cyclic loading. Ten specimens were prepared and tested. Four parameters were used to characterize seismic behavior: the replacement percentage of recycled coarse aggregate, slenderness ratio, axial compression level, and steel ratio. A novel calculation method for the bearing capacity for RCFST columns is established. The failure processes and modes of RCFST columns are found to be similar to normal concrete-filled steel tube columns. Varying the replacement percentage of recycled coarse aggregate has little effect on the hysteresis curves of the RCFST columns. The RCFST columns also show seismic performance similar to that of concrete-filled steel tubes. The displacement ductility of all specimens is larger than 3.0 and the equivalent viscous damping coefficients corresponding to the ultimate load range from 0.305 to 0.460.

scholarly journals Shear Bearing Capacity of Framework Joints of Steel-Reinforced Concrete-Filled Circular Steel Tube

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Yongjun Lin ◽  
Kaiqi Liu ◽  
Tianxu Xiao ◽  
Chang Zhou
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Plastic Material ◽  
Element Model ◽  
Steel Tube ◽  
Shear Capacity ◽  
Steel Reinforced Concrete ◽  
Shear Mechanism ◽  
Circular Steel Tube ◽  
Shear Bearing Capacity

In this paper, in order to investigate the shear mechanism and shear capacity of framework joints of steel-reinforced concrete-filled circular steel tube (SRCFCST), a numerical finite element model reflecting the mechanical behavior of framework joints of SRCFCST column-reinforced concrete beam is established through simulating concrete by the damage plastic constitutive model and simulating steel by the ideal elastic-plastic material, and its effectiveness is verified by experimental data. On account of uniform distribution of circular steel reinforced around the section and without definite flange and web, the shear mechanism of the framework joints of SRCFCST is analyzed on the basis of equivalent circular steel tube (CST) to the rectangular steel tube. The method for calculating the superposed shear bearing capacities of the joint core area is proposed, which is composed of four parts, i.e., concrete inside tube, concrete outside tube, hooping and steel-reinforced web; and the corresponding formulas for calculating shear bearing capacity are established. The comparative analysis of joints’ shear bearing capacity indicates that the results of numerical simulation and shear bearing capacity formulas coincide well with the experimental values, which can provide reference for the nonlinear analysis and engineering design of similar joints.

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.

scholarly journals Determination of Critical Load in a Nonuniform Circular Steel Column under the Eccentric Axial Load

2016 ◽  
Vol 2016 ◽  
pp. 1-9
Author(s):  
Stanislav Kotšmíd ◽  
Chang-Hung Kuo ◽  
Pavel Beňo
Keyword(s):  
Critical Load ◽  
Axial Load ◽  
Variable Cross Section ◽  
Steel Tube ◽  
Variable Cross ◽  
Runge Kutta Method ◽  
Circular Steel Tube ◽  
Load Carrying ◽  
Loading Tests ◽  
Different Diameters

The purpose of this paper is to determine a critical load for a nonuniform circular steel tube under eccentrically axial load. The circular tube has variable cross section at flattened ends with existing holes used for connection between members. Three different cases of eccentricities are studied with the drilled holes either on the same side or on the opposite side of column axis. The critical load is calculated from the differential equation of deflection curve which is solved by the power series and Runge-Kutta method. In addition, the loading tests were performed on a total of 180 specimens with different diameters, slenderness, and connection. The calculated results are compared and shown in a good agreement with those obtained from the experimental results. The results also show that the critical load decreases rapidly even at a small value of eccentricity and thus may have a significant effect on the load-carrying capacity.

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