Flexural Strengthening of Beams and Slabs

2014 ◽  
pp. 96-169
Keyword(s):  
Flexural Strengthening

Flexural Strengthening of Continuous Concrete Beams Using External Prestressed Steel Bars

PCI Journal ◽  
2015 ◽  
Vol 60 (1) ◽  
Author(s):  
Swoo-Heon Lee ◽  
Kyung-Jae Shin ◽  
Thomas H.-K. Kang
Keyword(s):  
Concrete Beams ◽  
Flexural Strengthening ◽  
Steel Bars

scholarly journals Flexural Performance of RC Beams Strengthened with Externally-Side Bonded Reinforcement (E-SBR) Technique Using CFRP Composites

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2809
Author(s):  
Md. Akter Hosen ◽  
Fadi Althoey ◽  
Mohd Zamin Jumaat ◽  
U. Johnson Alengaram ◽  
N. H. Ramli Sulong
Keyword(s):  
Absorption Capacity ◽  
Experimental Program ◽  
Rc Beams ◽  
Rc Structures ◽  
Functional Changes ◽  
Flexural Strengthening ◽  
Cfrp Laminates ◽  
Flexural Performance ◽  
Design Loads ◽  
Predicted Values

Reinforced concrete (RC) structures necessitate strengthening for various reasons. These include ageing, deterioration of materials due to environmental effects, trivial initial design and construction, deficiency of maintenance, the advancement of design loads, and functional changes. RC structures strengthening with the carbon fiber reinforced polymer (CFRP) has been used extensively during the last few decades due to their advantages over steel reinforcement. This paper introduces an experimental approach for flexural strengthening of RC beams with Externally-Side Bonded Reinforcement (E-SBR) using CFRP fabrics. The experimental program comprises eight full-scale RC beams tested under a four-point flexural test up to failure. The parameters investigated include the main tensile steel reinforcing ratio and the width of CFRP fabrics. The experimental outcomes show that an increase in the tensile reinforcement ratio and width of the CFRP laminates enhanced the first cracking and ultimate load-bearing capacities of the strengthened beams up to 141 and 174%, respectively, compared to the control beam. The strengthened RC beams exhibited superior energy absorption capacity, stiffness, and ductile response. The comparison of the experimental and predicted values shows that these two are in good agreement.

Flexural strengthening of steel beams using pultruded CFRP composite sheets with anchorage mechanisms

Structures ◽  
2021 ◽  
Vol 33 ◽  
pp. 1414-1427
Author(s):  
Selvakumarasami Kumaraguru ◽  
Paramasivan Alagusundaramoorthy
Keyword(s):  
Steel Beams ◽  
Flexural Strengthening ◽  
Cfrp Composite

Efficiency of CFRP NSM strips and EBR plates for flexural strengthening of RC beams and loading pattern influence

2015 ◽  
Vol 124 ◽  
pp. 163-175 ◽  
Author(s):  
Antonio Bilotta ◽  
Francesca Ceroni ◽  
Emidio Nigro ◽  
Marisa Pecce
Keyword(s):  
Rc Beams ◽  
Flexural Strengthening ◽  
Loading Pattern

Flexural strengthening of pre-cracked RC slabs with prestressed NSM CFRP laminates and evaluation of strain loss

2021 ◽  
pp. 136943322110105
Author(s):  
M.R. Mostakhdemin Hosseini ◽  
Salvador J.E. Dias ◽  
Joaquim A.O. Barros
Keyword(s):  
Carrying Capacity ◽  
Load Carrying Capacity ◽  
Limit States ◽  
Transfer Length ◽  
Rc Structures ◽  
Cracked Concrete ◽  
Flexural Strengthening ◽  
Cfrp Laminates ◽  
Load Carrying ◽  
Rc Slabs

The strengthening intervention of RC structures often involves already cracked concrete. To evaluate the effect of the level of damage prior to the strengthening (pre-cracks) on the behavior of the flexurally strengthened RC slabs with prestressed NSM CFRP laminates, an experimental research was carried out. Two pre-cracking levels of damage were analyzed and, for each one, three levels of prestress were tested (0%, 20% and 40%). The obtained results showed that the strengthening of damaged RC slabs with prestressed NSM CFRP laminates results in a significant increase on the load carrying capacity at serviceability limit states. Pre-cracked RC slabs strengthened with prestressed NSM CFRP laminates presented a load carrying capacity almost similar to the corresponding uncracked strengthened slabs. To determine the effective prestress level in CFRP laminates, the variation of strain over the length of the CFRP and over time was experimentally recorded. The prestress transfer length was also evaluated. The experimental results revealed that the transfer length of CFRP laminates was less than 150 mm, and the maximum value of strain loss out of transfer length (around 14%) was measured close to the cracked section of the damaged RC slabs. Significant part of strain loss in CFRP laminates occurred during 24 h after releasing the prestress load.

scholarly journals New small-diameter CFRP material for flexural strengthening of steel bridge girders

2015 ◽  
Vol 95 ◽  
pp. 748-756 ◽  
Author(s):  
Salar Tabrizi ◽  
Hamid Kazem ◽  
Sami Rizkalla ◽  
Akira Kobayashi
Keyword(s):  
Small Diameter ◽  
Bridge Girders ◽  
Steel Bridge ◽  
Flexural Strengthening

Dimensioning the Flexural Strengthening of Concrete Slabs with Textile Reinforced Mortar - Litterature Data Evaluation

2018 ◽  
Author(s):  
Alex-Manuel Muresan ◽  
Daia Zwicky
Keyword(s):  
Concrete Slabs ◽  
Test Results ◽  
Structural Concrete ◽  
Bond Behaviour ◽  
Flexural Strengthening ◽  
The Third ◽  
Reinforced Concrete Slabs ◽  
Main Challenge ◽  
External Reinforcement ◽  
Textile Reinforced Mortar

When strengthening reinforced concrete slabs with textile reinforced mortars (TRM), the “correct” consideration of the global bond behaviour between textile and cementitious matrix is identified as the main challenge in determining the most appropriate global analytical model. The first model evaluated here is based on classical assumptions for structural concrete design. The second model, as another extreme assumption, is completely neglecting textile bond in the cracked zone, thus assuming it as unbonded, end-anchored, external reinforcement. The third model is based on the simplifying assumption of the textile reinforcement being only significantly activated when the internal steel reinforcement is yielding. Analytical results from these approaches are compared to a database containing more than 130 test results reported in literature, and are statistically evaluated.

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