Verification and Validation of Corbels Strengthened by Unbonded Tendons and Bars

2020 ◽  
Vol 309 ◽  
pp. 157-162
Author(s):  
Lukáš Bobek ◽  
Lukáš Juříček ◽  
Michal Číhal ◽  
Jaromír Kabeláč ◽  
Michael Konečný
Keyword(s):  
Reinforced Concrete ◽  
Stress Field ◽  
Experimental Validation ◽  
Field Method ◽  
Load Bearing Capacity ◽  
Concrete Members ◽  
Unbonded Tendons ◽  
Independent Analysis ◽  
Real Behavior ◽  
Stiffening Effect

Reinforced corbels are frequently used in industrial halls. A number of existing corbels are prestressed by unbonded tendons or bars in order to increase their load-bearing capacity, decrease the deflections and restrain cracks spreading. The goal of the project was experimental validation of the reinforced concrete corbel strengthened using unbonded tendons via CSFM (Compatible Stress Field Method). The method is based on materially nonlinear calculation considering the tension stiffening effect of rebars and compression softening of concrete. These effects and other assumptions implemented in CSFM capture real behavior of reinforced concrete members. Besides, CSFM is verified using an independent analysis, which is based on similar assumptions as those in Compatible Stress Field Method.

Prestressing Unbonded Tendons for Cast In-Situ Post-Tensioned Reinforced Concrete Members

2018 ◽  
Vol 759 (5) ◽  
pp. 32-37 ◽  
Author(s):  
E.A. CHISTYAKOV ◽  
◽  
S.A. ZENIN ◽  
R.Sh. SHARIPOV SHARIPOV ◽  
O.V. KUDINOV ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Concrete Members ◽  
Unbonded Tendons ◽  
Post Tensioned

EXPERIMENTAL INVESTIGATION ON STRENGTHENING OF REINFORCED CONCRETE COLUMNS WITH CARBON CONCRETE COMPOSITE

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Klaus Holschemacher ◽  
Dennis Messerer ◽  
Wladislaw Polienko
Keyword(s):  
Reinforced Concrete ◽  
Carbon Fiber ◽  
Bearing Capacity ◽  
Cross Sections ◽  
Concrete Columns ◽  
Experimental Program ◽  
Load Bearing Capacity ◽  
Reinforced Concrete Columns ◽  
Load Bearing ◽  
Concrete Members

The application of textile reinforced concrete is well-approved technique for strengthening of reinforced concrete members. When using carbon fiber meshes and carbon fiber reinforced polymer bars as reinforcement, this material is called carbon concrete composite. Based on the outstanding properties of carbon fibers, carbon concrete composite is characterized by high bending and tensile strength, and good durability. Therefore, carbon concrete composite is increasingly applied as replacement for ordinary steel bar or steel mesh reinforced concrete. It is favorable building material for production of new buildings and for strengthening of existing reinforced concrete members. In the context of strengthening of existing reinforced concrete columns, it is a usual procedure to cover the member’s surface with a thin layer of carbon concrete composite aiming on reduction of lateral strains of the core concrete when load is increasing. The result is an increased load-bearing capacity of the strengthened column. However, there is insufficient knowledge about the influence of curvature of the carbon meshes in circular cross-sections and in the corners of rectangular cross-sections on their load-bearing capacity. For this reason, an experimental program started to study the influence of curvature, number and type of mesh layers and specimen dimensions on structural behavior of strengthened columns under axial loading. As main outcome it can be stated that besides the curvature other parameters like yarn properties are of essential importance.

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