The Mechanical Properties of FRP Fabric Steel-Reinforced Concrete Columns

The mechanical properties of FRP steel-reinforced concrete columns are discussed. We study the constitutive relation of the concrete, based on the model and the experimental dates for the control the size of affecting parameters. When using the used model, the experimental dates can be reanalyzed and corrected for the intensity correct formula of FRP column. The ultimate bearing capacities of FRP constraint rectangular column use superposition principle to calculate the strength calculation. The ultimate bearing capacity of FRP column is divided into two parts: we conclude the big eccentric bearing capacity calculators formula by the columns bend. Through the study of the column, we concluded that the eccentric loading little eccentric calculation formula of bearing capacity. A case though using the example of this formula is similar with experiments results of the data.

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Experimental Study on the Mechanical Properties of Reinforced Concrete Columns after Exposure to Fire

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.243-249.5122 ◽

2011 ◽

Vol 243-249 ◽

pp. 5122-5127

Author(s):

Jia Feng Xu ◽

Ming Zhe Liu ◽

Yue Feng Tang

Keyword(s):

Mechanical Properties ◽

Reinforced Concrete ◽

Bearing Capacity ◽

Failure Mode ◽

Room Temperature ◽

Ultimate Load ◽

Concrete Columns ◽

Load Bearing Capacity ◽

Reinforced Concrete Columns ◽

Load Bearing

This paper provided three test data pertaining to the mechanical properties of reinforced concrete columns after exposure to ISO834 standard fire and three comparative test data pertaining to the mechanical properties of reinforced concrete columns at room temperature, mainly concerning the influence of fire on failure mode, distortion performance and ultimate load bearing capacity of reinforced concrete columns under axial and eccentric compression. Test results show that the failure mode of reinforced concrete columns after exposure to fire is basically same with that at room temperature. With the same concrete strength and heating condition, the bearing capacity of specimens reduces as the eccentricity increases. Strain along the section height of eccentric columns after fire basically agree with the plane section supposition while the flexural rigidity and ultimate load bearing capacity decreases obviously. The residual load bearing capacity of reinforced concrete columns after exposure to fire is only about 25% to 37% of that at room temperature.

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Research on the Mechanical Properties of Fire-Damaged Reinforced Concrete Columns Strengthened with CFRP

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.193-194.1429 ◽

2012 ◽

Vol 193-194 ◽

pp. 1429-1435

Author(s):

Dong Liang Qiu ◽

Kai Yu ◽

Guo Feng Wang ◽

Jun Hua Li

Keyword(s):

Mechanical Properties ◽

Reinforced Concrete ◽

Bearing Capacity ◽

Temperature Control ◽

Concrete Columns ◽

Load Bearing Capacity ◽

Reinforced Concrete Columns ◽

Load Bearing ◽

Standard Fire ◽

Reinforced Polymer

The mechanical properties of fire-damaged reinforced concrete columns rehabilitated by carbon fiber-reinforced polymer (CFRP) rods were studied. This study aims at the effectiveness of CFRP through the contrast test. Nine specimens were tested, including three normal temperature control specimens, and six specimens heated under ISO834 standard fire. After the specimens were exposed to fire, three of them were rehabilitated by CFRP. All specimens were loaded monotonically to failure in the same way. The results showed that the failure of reinforced concrete columns rehabilitated by CFRP was due to losing stabilization, whereas the others were material broken. Furthermore, because of the fire, the load-bearing capacity of specimens was all declined sharply compared with these at normal temperature. From this research, comparing with these normal temperature control specimens, the load-bearing capacity of specimens exposed to fire firstly was ranged from 0.25 to 0.37 times. But the ratio of the loading capacity of specimens rehabilitated by CFRP and normal temperature control ones was ranged from 0.54 to 0.67.

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SETTING A DIAGRAM APPROACH TO CALCULATING VIBRATED, CENTRIFUGED AND VIBROCENTRIFUGED REINFORCED CONCRETE COLUMNS WITH A VARIATROPIC STRUCTURE

НАУЧНЫЙ ЖУРНАЛ СТРОИТЕЛЬСТВА И АРХИТЕКТУРЫ ◽

10.36622/vstu.2020.60.4.002 ◽

2020 ◽

pp. 22-34

Author(s):

Л. Р. Маилян ◽

С. А. Стельмах ◽

Е. М. Щербань ◽

М. П. Нажуев

Keyword(s):

Experimental Data ◽

Reinforced Concrete ◽

Bearing Capacity ◽

Cross Section ◽

Concrete Columns ◽

Reinforced Concrete Columns ◽

The Cross ◽

Concrete Elements ◽

Diagram Approach

Состояние проблемы. Железобетонные элементы изготавливаются, как правило, по трем основным технологиям - вибрированием, центрифугированием и виброцентрифугированием. Однако все основные расчетные зависимости для определения их несущей способности выведены, исходя из основного постулата - постоянства и равенства характеристик бетона по сечению, что реализуется лишь в вибрированных колоннах. Результаты. В рамках диаграммного подхода предложены итерационный, приближенный и упрощенный способы расчета несущей способности железобетонных вибрированных, центрифугированных и виброцентрифугированных колонн. Выводы. Расчет по диаграммному подходу показал существенно более подходящую сходимость с опытными данными, чем расчет по методике норм, а также дал лучшие результаты при использовании дифференциальных характеристик бетона, чем при использовании интегральных и, тем более, нормативных характеристик бетона. Statement of the problem. Reinforced concrete elements are typically manufactured according to three basic technologies - vibration, centrifugation and vibrocentrifugation. However, all the basic calculated dependencies for determining their bearing capacity were derived using the main postulate, i.e., the constancy and equality of the characteristics of concrete over the cross section, which is implemented only in vibrated columns. Results. Within the framework of the diagrammatic approach, iterative, approximate and simplified methods of calculating the bearing capacity of reinforced concrete vibrated, centrifuged and vibrocentrifuged columns are proposed. Conclusions. The calculation according to the diagrammatic approach showed a significantly better convergence with the experimental data than that using the method of norms, and also performs better when using differential characteristics of concrete than when employing integral and particularly standard characteristics of concrete.

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