Analysis on Deformation of Pre-Splitting Steel Reinforced Concrete Beams Strengthened by Prestressed CFRP

2011 ◽  
Vol 243-249 ◽  
pp. 929-933
Author(s):  
Na Ha ◽  
Lian Guang Wang ◽  
Shen Yuan Fu
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Concrete Beams ◽  
Bending Moment ◽  
Reinforced Concrete Beams ◽  
Steel Reinforced Concrete ◽  
Cfrp Sheets ◽  
Deformation Curves ◽  
Prestressed Cfrp Sheets ◽  
Theoretical Results

In order to improve the bearing capacity of SRC which is related with deformation and stiffiness, SRC beams should be strengthened by CFRP. Based on the experiment of six pre-splitting steel reinforced concrete beams strengthened with (Prestressed) CFRP sheets, the deformation of beams are discussed. Load-deformation curves are obtained by the experiment. Considering the influence of intial bending moment on SRC beams, the calculated deformation formulas of SRC beams strengthened by (Prestressed) CFRP are deduced. The results showed that the load-deformation curves of normal and strengthened beams respectively showed three and two linear characteristics. The theoretical results which calculated by the formulas of deformation are well agreement with the experimental results.

Experimental Study of Cyclic Loading Behaviors of Impaired Reinforced Concrete Beams Strengthening with Prestressed CFRP Sheets

2012 ◽  
Vol 201-202 ◽  
pp. 483-486
Author(s):  
Li Yun Pan ◽  
Song Chen ◽  
Shun Bo Zhao ◽  
Chang Yong Li
Keyword(s):  
Experimental Study ◽  
Reinforced Concrete ◽  
Cyclic Loading ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Bottom Surface ◽  
Cfrp Sheets ◽  
Cfrp Sheet ◽  
Prestressed Cfrp Sheets ◽  
Ultimate Resistance

The experimental study was carried out on the cyclic loading behaviors of impaired reinforced concrete beams strengthening with prestressed CFRP sheets. Eight beams in four groups with or without strengthening with prestressed CFRP sheets were tested, in which one or two layers of prestressed CFRP sheet were bonded on the bottom surface of the beams. Based on the analyses of test results, the flexural stiffness and ultimate resistance under cyclic load were effectively enhanced for the strengthened beams with the increasing layers of CFRP sheet, but the ductility of their mid-span deflection was reduced.

The Typical Methods of Using Section Steel Reinforced Concrete Beams and Slab

2012 ◽  
Vol 204-208 ◽  
pp. 885-888
Author(s):  
Xiu Hua Li ◽  
Cheng Wu Wang ◽  
Chen Xi Yue ◽  
Jiang Dong Cai
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Concrete Beams ◽  
Concrete Slab ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Beams ◽  
Reinforced Concrete Slab ◽  
State Regulations ◽  
Steel Reinforced Concrete ◽  
Industrial Buildings

The technology of Concrete beams and slab reinforcement is one of the key technologies of reinforcing and reusing existing buildings. There are many ways of reinforcement on the components and there are also some relevant state regulations. Take the carbon fiber sheet reinforcement technology as an example. It is mainly used to improve the bearing capacity of concrete, but plays limited role in improving the stiffness of concrete. When the changes in the load of industrial buildings are relatively large, it is difficult for this approach to achieve the purpose of reinforcement. While using section steel reinforced concrete slab can not only improve the bearing capacity of beams and plates, but also significantly increase the stiffness of beams and slab. The paper by introducing different methods of section steel reinforced concrete beam, beam end bearing and slab, the essay shows the improvement that a variety of reinforcement methods have made on bearing capacity and stiffness, and points out the precautions during the construction, which provides a reference for engineering applications.

scholarly journals Ductility and Ultimate Capacity of Prestressed Steel Reinforced Concrete Beams

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Chengquan Wang ◽  
Yonggang Shen ◽  
Runfang Yang ◽  
Zuolin Wen
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Element Model ◽  
Ultimate Bearing Capacity ◽  
Reinforced Concrete Beams ◽  
Structural Behaviour ◽  
Element Analysis ◽  
Steel Reinforced Concrete ◽  
Deformation Curves

Nonlinear numerical analysis of the structural behaviour of prestressed steel reinforced concrete (PSRC) beams was carried out by using finite element analysis software ABAQUS. By comparing the load-deformation curves, the rationality and reliability of the finite element model have been confirmed; moreover, the changes of the beam stiffness and stress in the forcing process and the ultimate bearing capacity of the beam were analyzed. Based on the model, the effect of prestressed force, and H-steel to the stiffness, the ultimate bearing capacity and ductility of beam were also analyzed.

Strengthening of Reinforced Concrete Beams by Carbon Fiber Composites

2018 ◽  
Vol 931 ◽  
pp. 379-384
Author(s):  
Yuri V. Ivanov ◽  
Yuri F. Rogatnev ◽  
Igor I. Ushakov
Keyword(s):  
Reinforced Concrete ◽  
Carbon Fiber ◽  
Bearing Capacity ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Carbon Fiber Composites ◽  
Limiting State ◽  
Reinforced Plastics ◽  
Reinforced Beams ◽  
The Given

The paper considers the results of the experimental study of the reinforced concrete beams strengthened by carbon fiber reinforced plastics (the CFRP). Eight reinforced concrete beams of the 80x160 mm section and 1500 mm designed span have been manufactured and tested. The influence of the number of the CFRP layers (strengthening power) on bearing capacity and rigidity under the static loading of beams in the thirds of the span has been studied. The results obtained indicate the increase in bearing capacity of the reinforced beams from 24% up to 55% and the increase in rigidity by 45% for the commonly adopted limiting state, i.e. achieving ultimate deformations in concrete of the compressed zone). The paper underlines the need for using anchor devices in the form of U-shaped binders to ensure the efficiency of the given method of strengthening.

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