Confined Concrete Columns Subjected to Axial Load, Cyclic Shear, and Cyclic Flexure—Part I: Analytical Models

2002 ◽  
Vol 99 (1) ◽  
Keyword(s):  
Axial Load ◽  
Concrete Columns ◽  
Confined Concrete ◽  
Analytical Models ◽  
Cyclic Shear

scholarly journals FRP-Confined Concrete Columns: A New Procedure for Evaluating the Performance of Square and Circular Sections

2018 ◽  
Vol 2018 ◽  
pp. 1-15 ◽  
Author(s):  
Marinella Fossetti ◽  
Francesco Basone ◽  
Giuseppe D’Arenzo ◽  
Giuseppe Macaluso ◽  
Alfio Francesco Siciliano
Keyword(s):  
Concrete Columns ◽  
Confined Concrete ◽  
Analytical Models ◽  
Dissipated Energy ◽  
Element Analysis ◽  
The Many ◽  
Open Question ◽  
Semiempirical Models ◽  
Strength And Ductility

In the last few decades, the upgrading of existing reinforced concrete columns with the use of FRP jackets has met with increasing interest for its effectiveness and ease of application. The use of these kinds of jackets ensures an improvement of the affected column in terms of strength and ductility; however, the prediction of behavior of columns wrapped with FRP jackets is still an open question because of the many parameters that influence the effectiveness of the upgrading technique, and several semiempirical models are proposed. Because these models are often only applicable to specific cases, in this paper, a generalized criterion for the determination of the increase in strength, in ductility, and in dissipated energy for varying corner radius ratios of the cross section and fiber volumetric ratios is shown. Numerical results using a finite element analysis, calibrated on the basis of experimental data available in the literature, are carried out to calibrate the new analytical models. A comparison with some available models confirms the reliability of the proposed procedure.

Compressive behavior of concrete-filled steel tubular columns with internal high-strength steel spiral confinement

2020 ◽  
pp. 136943322098165
Author(s):  
J.G. Teng ◽  
J.J. Wang ◽  
Guan Lin ◽  
J. Zhang ◽  
P. Feng
Keyword(s):  
Axial Compression ◽  
High Strength Steel ◽  
Axial Load ◽  
Axial Strain ◽  
High Strength ◽  
Concrete Columns ◽  
Steel Tube ◽  
Confined Concrete ◽  
Experimental Program ◽  
Cfst Columns

Concrete-filled steel tubular (CFST) columns have been extensively studied and widely used in practice. Existing research has shown that non-circular CFST columns is much less ductile than their circular counterparts, particularly when thin/high strength steel (HSS) tubes and high-strength concrete are used. To address this problem, a new form of CFST columns has recently been proposed by the first author. The new column consists of a steel tube filled with concrete that is confined with HSS spiral reinforcement typically with a yield stress exceeding 1000 MPa. These columns, referred to as confined concrete-filled steel tubular (CCFST) columns, also maintain the ease for connection to CFST or steel beams. This paper presents the results of a series of concentric axial compression tests on such columns of square cross-section to demonstrate their advantages. The experimental program included 13 CCFST columns, four CFST columns without internal spiral confinement, two hollow steel tube (HST) columns, and 11 circular HSS spiral-confined concrete columns. Three different compressive strengths and three HSS spiral pitches were examined in the experimental program. The CFST columns, HST columns, and HSS spiral-confined concrete columns were all tested under axial compression to gain a good understanding of the confinement mechanism in a CCFST column. The test results show that the new columns possess much greater ductility than those without internal spiral confinement, although the use of HSS spirals increases the steel volume by only a small percentage. It is also shown that the axial load-axial strain curve of a CCFST column can be conservatively predicted by summing the axial load-axial strain curves of the hollow steel tube without local buckling, the HSS spiral-confined concrete core, and the sandwiched concrete between the two.

scholarly journals Axial Load Behavior of Ultrahigh Strength Concrete-Filled Steel Tube Columns of Various Geometric and Reinforcement Configurations

2021 ◽  
Vol 6 (5) ◽  
pp. 66
Author(s):  
Khandaker M. A. Hossain ◽  
Katie Chu ◽  
Muhammed S. Anwar
Keyword(s):  
Axial Load ◽  
Concrete Strength ◽  
Steel Tube ◽  
Confined Concrete ◽  
Analytical Models ◽  
Concrete Filled Steel Tube ◽  
Axial Strength ◽  
Strength Concrete ◽  
Ultrahigh Strength ◽  
Cfst Columns

This paper presents the behavior of concrete-filled steel tube (CFST) columns infilled with fiber-reinforced self-consolidating ultrahigh strength concrete (UHSC) subjected to axial concentric monotonic loading to failure. UHSC is expected to improve ease of fabrication, strength, and ductility of CFST columns. Seventeen columns having varying geometric properties such as tube wall thickness, cross-sectional shape (circular, rectangular, and square), and slenderness were constructed and tested by applying load through both steel tube and concrete core. Circular columns were further distinguished by the presence or absence of main and hoop steel reinforcing bars in the core concrete. Axial load-displacement response, axial/transverse strain development, and failure modes were recorded during the loading history to analyze the performance. Experimental confined concrete strength and axial strength of UHSC-filled CFST columns were compared with those obtained from three suggested analytical models and three code-based design procedures including Eurocode 4, Canadian CAN/CSA S16, and American AISC. Analytical models were found to over-predict the confined concrete strength and the axial strength of CFST columns. Canadian and American codes were found to be most applicable for predicting axial strength of UHSC-filled CFST columns while remaining conservative.

Combined Bending and Axial Load in Prestressed Concrete Columns

PCI Journal ◽  
1966 ◽  
Vol 12 (3) ◽  
pp. 52-59 ◽  
Author(s):  
Paul Zia ◽  
E. C. Guillermo
Keyword(s):  
Prestressed Concrete ◽  
Axial Load ◽  
Concrete Columns
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