scholarly journals Study on the flexural performance of RC beams anchored with CFRP plates under secondary load

2021 ◽  
Vol 233 ◽  
pp. 03024
Author(s):  
Xiangrui Feng ◽  
Xian Cui ◽  
Haikun Luo
Keyword(s):  
Bearing Capacity ◽  
Bending Strength ◽  
Concrete Beams ◽  
Ultimate Bearing Capacity ◽  
Reinforced Concrete Beams ◽  
Rc Beams ◽  
Flexural Performance ◽  
Cfrp Plate ◽  
Secondary Load ◽  
Structural Indicators

In order to explore the influence of length and width of CFRP as well as anchor spacing on the reinforcement effectiveness of CFRP plates on reinforcement concrete beams (RC beams) under secondary load, 7 anchored damaged FRP reinforced concrete beams are used as test beams, 1 unanchored beam is used as a control beam, and structural indicators such as ultimate load and bending strength are analyzed in the result. The conclusion is that composite CFRP plate can effectively prevent the early peeling and failure of carbon plates and improve the ultimate bearing capacity of the beam. When the width of the CFRP plate decreases, the thickness increases and the steel plate anchor spacing increases appropriately, the ultimate bearing capacity and ductility of the beam are significantly improved.

An Study on the Flexural Performance of Reninforced Concrete Beams Considering Loading History with Pre-Stressed Cfrp Sheets

2011 ◽  
Vol 105-107 ◽  
pp. 853-856
Author(s):  
Zhe Li ◽  
Gang Li ◽  
Qin Zhao ◽  
Shuai Zhang
Keyword(s):  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Impact Factors ◽  
Cfrp Sheets ◽  
Flexural Performance ◽  
Reinforced Polymer ◽  
Secondary Load ◽  
Cfrp Sheet

For the effect of nonpre-stressed carbon fiber reinforced polymer (CFRP) Sheet Strengthening concrete beams to improve bending stiffness and crack resistance is not satisfactory, and it is difficult to totally unloading on the actual reinforcement, so in this paper, ANSYS is used to research the strengthened effectiveness and impact factors of pre-stressed CFRP reinforced concrete beams considering the secondary load.

Test Analysis for RC Beams Strengthened with Externally Bonded Prestressed CFRP Laminates

2008 ◽  
Vol 385-387 ◽  
pp. 41-44 ◽  
Author(s):  
Shi Qi Cui ◽  
Jin Shan Wang ◽  
Zhao Zhen Pei ◽  
Zhi Liu
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Rc Beams ◽  
Test Results ◽  
Test Analysis ◽  
Cfrp Laminates ◽  
Cfrp Sheet ◽  
Externally Bonded

Reinforced concrete beams strengthened with externally bonded CFRP sheet and prestressed CFRP are analyzed in this paper. Crack developments and displacements with curvatures for different beams are analyzed. Test results show that prestressed CFRP are able to control the development of macro cracks in concrete and prestressed CFRP is an effective method to improve the toughness of concrete, reduce strengthening cost and meanwhile enhance bearing capacity of concrete beams.

The Experimental Study on Bearing Capacity of Reinforced Concrete Structure with Different Reinforce Methods

2014 ◽  
Vol 936 ◽  
pp. 1438-1441
Author(s):  
Qing Yi Liu ◽  
Xiao Mei Liu
Keyword(s):  
Experimental Study ◽  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Steel Plate ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Rc Beams ◽  
Test Results ◽  
Reinforced Concrete Structure ◽  
Fiber Sheet

Three reinforcement materials with steel plate, epoxies resin sheet, and glass fiber sheet adhering to failed reinforced concrete beams (RC beams) were used to improve the bearing capacity of Reinforced Concrete beams in the paper. The test results shows all the three materials were proved satisfied with bearing capacity increasing request. Strengthening effects with steel plate and epoxies resin sheet were more obvious.

Study on Flexural Performance of RC Beams Strengthened with Prestressed CFRP Plates

2011 ◽  
Vol 250-253 ◽  
pp. 3361-3366
Author(s):  
Hua Chen ◽  
Kan Kang ◽  
Lang Ni Deng ◽  
Peng Zhang
Keyword(s):  
Ultimate Load ◽  
Concrete Beams ◽  
Experimental Results ◽  
Reinforced Concrete Beams ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Rc Beams ◽  
Yield Load ◽  
Flexural Performance ◽  
Reinforced Polymer

For RC beams strengthened with prestressed carbon fiber reinforced polymer (CFRP) plates, calculate methods for the cracking load, the yield load and the ultimate load are derived base on the analysis of normal section stress. The test of reinforced concrete beams strengthened with prestressed CFRP plates were carried out, and analytical results are compared with experimental results. Comparisons show that the calculated values agree well with the experimental results.

Finite Element Analysis of Reinforce RC Beams Considering Loading History with Pre-Stressed CFRP Sheets

2014 ◽  
Vol 1025-1026 ◽  
pp. 862-867
Author(s):  
Xian Peng Liu ◽  
Chang Guo
Keyword(s):  
Finite Element ◽  
Bearing Capacity ◽  
Impact Analysis ◽  
Reinforced Concrete Beam ◽  
Rc Beams ◽  
Element Analysis ◽  
Cfrp Plate ◽  
Secondary Load ◽  
Load Conditions

Reinforcement of beams and plates in high-pile wharf is important measures to ensure the safe operation of the old pier. Performance of prestressed CFRP plate reinforced concrete beam was carried out finite element calculation and analyzed in secondary load conditions use of the cell death technology and load multi-step control, various parameters impact analysis was performed. The results were showed that the bearing capacity of RC beams reinforced and stiffness were improved greatly; Ultimate bearing capacity of RC beams were strengthened by unstressed condition, compared with decline in the secondary load conditions and stiffness did not change significantly; CFRP plate reinforcement should give full play to the role of being the initial cracking reinforcement in the beam in the same reinforced conditions.

scholarly journals Corrosion of RC Beams During Time

2019 ◽  
Vol 1 (1) ◽  
pp. 311-318
Author(s):  
Yaroslav Blikharskyy ◽  
Roman Khmil ◽  
Zinoviy Blikharskyy
Keyword(s):  
Bearing Capacity ◽  
Concrete Beams ◽  
Thermal Power ◽  
Experimental Studies ◽  
Reinforced Concrete Beams ◽  
Simultaneous Action ◽  
Rc Beams ◽  
Force Loading ◽  
Aggressive Environment ◽  
Previous Loading

Abstract This article presented results of impact corrosion on reinforce concrete beams during time with previous loading. Before testing the RC beams were loaded by 37% and 75% from bearing-capacity load of undamaged corrosion beams. There were tested two types of beams. First type beams were tested under force loading action and second type beams were tested under force loading and corrosion action. As an aggressive environment were used the 10% solution of sulfuric acid H2SO4. Such environment takes place in separate chemical manufactures, galvanic workshops, flue pipes of thermal power plants. The results of experimental studies have established that the effect of the aggressive environment with simultaneous loading significantly impairs the stress-strain state of reinforced concrete beams. Bearing capacity due to the yielding of reinforcement bars for specimens with the simultaneous action of aggressive environment and previous loading of 37% and 75% takes place on 51…53 and 58…60 days. The destruction of these specimens, by crushing compressive concrete, at previous loading 37% occurred after 75…79 and at previous loading 75% - after 79…88 days. The history loading does not impact significantly on beams failure, on finite deflections and timing exhaustion bearing capacity since the start of the simultaneous action of aggressive environment and loading.

Experimental study on flexural strengthening of reinforced concrete beams with U-shaped steel under secondary load

2021 ◽  
pp. 136943322110369
Author(s):  
Qingli Lin ◽  
Yiyan Lu ◽  
Wenshui Tang ◽  
Dongshan Lei
Keyword(s):  
Reinforced Concrete ◽  
Reference Beam ◽  
Reinforced Concrete Beams ◽  
Bottom Plate ◽  
Strengthening Effect ◽  
Rc Beams ◽  
Flexural Strengthening ◽  
Flexural Performance ◽  
Initial Loading ◽  
Secondary Load

This study proposes a new method to strengthen reinforced concrete (RC) beams with U-shaped steel, which can achieve rapid construction and great improvement in the flexural performance of RC beams. To investigate the influence of secondary load defined as newly applied loads after strengthening on the strengthening effect, a total of nine specimens were tested under four-point bending, including a reference beam, a strengthened beam under initial load, and seven strengthened beams under secondary load. The initial loading degree, the thickness of the bottom plate, and the height of the steel box were the main variables considered in this study. Testing results showed that compared with the reference beam, the flexural performance of strengthened beams was significantly enhanced, indicating the good joint performance of the U-shaped steel and the RC beams. Among the three main variables, the initial loading degree was found to have a minimal effect on the flexural performance while the thickness of the bottom plate and the height of the steel box had considerable influence, with the latter having a more pronounced effect. Testing results also showed that most of the strengthened beams experienced flexural failures, which were reflected by steel web peeling and buckling, and concrete crushing. Moreover, a formula was derived for calculating the flexural capacity of strengthened beams under secondary load. The results from the derived formula were found to be in good agreement with those from experiments.

scholarly journals Experimental study of RC beams strengthened for bending by reinforced grout layer and connectors

2018 ◽  
Vol 11 (4) ◽  
pp. 810-833
Author(s):  
J. H. CANAVAL ◽  
T. J. DA SILVA ◽  
A. C. SANTOS
Keyword(s):  
Experimental Study ◽  
Experimental Investigation ◽  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Concrete Beams ◽  
Point Load ◽  
Reinforced Concrete Beams ◽  
Bending Test ◽  
Experimental Program ◽  
Rc Beams

Abstract This work is based on an experimental investigation of reinforced concrete beams strengthened to flexure for wrapping applying a type of metallic connector in the bond substrate/groute. The experimental program consisted of 5 beams used for reference (without strengthening), 5 beams reinforced with surface brushed texture substrate and 5 beams with metal connectors bonded to the substrate. The beams were submitted to four-point load bending test. Initially with a partial loading, executed the strengthening and were finally tested until the break. The strengthening was made up by the increase by graute, on the sides and bottom of the beam and reinforcing. The applied force, the displacement, deformations in steel and in concrete were measured. The reference beams failure by flexing with the calculated charges. The bending strengthening proved efficient, increasing the bearing capacity in 44% and the failure was by shear in the stretch without strengthening. Beams with connectors the increase was higher.

Experimental Study on Short-Term Rigidity for Reinforced Concrete Beams Strengthened with CFRP Board

2010 ◽  
Vol 163-167 ◽  
pp. 3421-3428
Author(s):  
Yun Xu ◽  
Yin Xu ◽  
Jin Tang Cai ◽  
Hong Guang Luo
Keyword(s):  
Finite Element Analysis ◽  
Experimental Study ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Rc Beams ◽  
Short Term ◽  
Element Analysis ◽  
Rc Structure ◽  
Secondary Load ◽  
Essay Test

The experimental study and finite element analysis of RC beams strengthened with CFRP board are introduced in this essay. Test research of six beams stuck with CFRP board on their tension faces has been carried out on rigidity by contrasting with three non­strengthened beams. Three specimens are primary loading beams and the others are secondary loading beams, the calculating formula for the short-term rigidity on the section of concrete beams strengthened with CFRP board has been established. Calculation is carried out on short-term deflection of RC beams strengthened with CFRP board subjected to primary load and secondary load. The results indicate that the RC structure can be strengthened effectively by sticking with CFRP board, so that the expansion of crack and rigidity of beam can be controlled especially, and the experimental results compared with those predicted by the formula in resemblance.

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