Experimental investigation on axial compression behavior of laminated bamboo lumber short columns confined with CFRP

It is crucial to study the axial compression behavior of concrete-filled steel tubular (CFST) columns to ensure the safe operation of engineering structures. The restriction between steel tubular and core concrete in CFSTs is complex and the relationship between geometric and material properties and axial compression behavior is highly nonlinear. These challenges have prompted the use of soft computing methods to predict the ultimate bearing capacity (abbreviated as Nu) under axial compression. Taking the square CFST short column as an example, a mass of experimental data is obtained through axial compression tests. Combined with support vector machine (SVM) and particle swarm optimization (PSO), this paper presents a new method termed PSVM (SVM optimized by PSO) for Nu value prediction. The nonlinear relationship in Nu value prediction is efficiently represented by SVM, and PSO is used to select the model parameters of SVM. The experimental dataset is utilized to verify the reliability of the PSVM model, and the prediction performance of PSVM is compared with that of traditional design methods and other benchmark models. The proposed PSVM model provides a better prediction of the ultimate axial capacity of square CFST short columns. As such, PSVM is an efficient alternative method other than empirical and theoretical formulas.

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Experimental investigation on axial compression behavior of steel reinforced concrete columns with welded stirrups

Engineering Structures ◽

10.1016/j.engstruct.2019.109924 ◽

2020 ◽

Vol 208 ◽

pp. 109924

Author(s):

Lele Sun ◽

Qijie Ma ◽

Fei Han ◽

Zexin Liu ◽

Jinglong Li ◽

...

Keyword(s):

Experimental Investigation ◽

Reinforced Concrete ◽

Axial Compression ◽

Concrete Columns ◽

Reinforced Concrete Columns ◽

Compression Behavior ◽

Steel Reinforced Concrete

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Experimental Study on Axial Compression Behavior and Bearing Capacity Analysis of High Titanium Slag CFST Columns

Applied Sciences ◽

10.3390/app9102021 ◽

2019 ◽

Vol 9 (10) ◽

pp. 2021 ◽

Cited By ~ 1

Author(s):

Chunli Zhou ◽

Wei Chen ◽

Xiaolong Ruan ◽

Xueying Tang

Keyword(s):

Bearing Capacity ◽

Axial Compression ◽

Concrete Strength ◽

Diameter Ratio ◽

Tube Steel ◽

Titanium Slag ◽

Compression Behavior ◽

Strength Grade ◽

Short Columns ◽

Cfst Columns

In order to study the axial compression behavior of concrete-filled steel tubular (CFST) columns filled with high titanium slag, a total of 32 specimens, including normal CFST columns, half-high titanium slag CFST columns, and full-high titanium slag CFST columns, were used as experimental samples in this study. The axial compression behaviors of high titanium slag CFST columns and normal CFST columns with various parameters such as length–diameter ratio, strength grade of concrete, strength grade of steel tube, steel content ratio, etc., were evaluated and compared through axial compression testing under monotonic static loading. The results showed that the axial compressive behaviors of high titanium slag CFST columns with various length–diameter ratios were not significantly different from those of normal CFST columns, both of which showed good axial compression performance. In addition, the length–diameter ratio limit between short and medium long column was from 3.5 to 4.4. The length–diameter ratio was the main factor influencing the shape of load–deformation curve of CFST columns. The casing hoop coefficient also had a great influence on the bearing capacity of short columns, while the influence on that of middle and long columns was not obvious. In the end, the bearing capacities of all specimens were calculated by bearing capacity formulas in European EC4, American AISC360-10, and Chinese GB50936-2014 standards. The calculated values were in good agreement with the test results.

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