Experimental study on flexural shear strengthening effect on low-strength RC beams by using FRP grid and ECC

2021 ◽  
Vol 227 ◽  
pp. 111434
Author(s):  
Rui Guo ◽  
Yu Ren ◽  
Mengqi Li ◽  
Peng Hu ◽  
Min Du ◽  
...  
Keyword(s):  
Experimental Study ◽  
Strengthening Effect ◽  
Rc Beams ◽  
Shear Strengthening ◽  
Low Strength

scholarly journals Combined Flexural and Shear Strengthening of RC T-Beams with FRP and TRM: Experimental Study and Parametric Finite Element Analyses

Buildings ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 520
Author(s):  
Daniel A. Pohoryles ◽  
Jose Melo ◽  
Tiziana Rossetto
Keyword(s):  
Experimental Study ◽  
Finite Element ◽  
Shear Capacity ◽  
Fe Model ◽  
Rc Beams ◽  
Shear Strengthening ◽  
Flexural Strengthening ◽  
Existing Structures ◽  
The Difference ◽  
Reinforcement Design

Due to inadequacies of reinforcement design in older structures and changes in building codes, but also the change of building use in existing structures, reinforced concrete (RC) beams often require upgrading during building renovation. The combined shear and flexural strengthening with composite materials, fibre-reinforced polymer sheets (FRP) and textile reinforced mortars (TRM), is assessed in this study. An experimental campaign on twelve half-scale retrofitted RC beams is presented, looking at various parameters of interest, including the effect of the steel reinforcement ratio on the retrofit effectiveness, the amount of composite material used for strengthening and the effect of the shear span, as well as the difference in effectiveness of FRP and TRM in strengthening RC beams. Significant effects on the shear capacity of composite retrofitted beams are observed for all studied parameters. The experimental study is used as a basis for developing a detailed finite element (FE) model for RC beams strengthened with FRP. The results of the FE model are compared to the experimental results and used to design a parametric study to further study the effect of the investigated parameters on the retrofit effectiveness.

Experimental Study of Strengthening of Reinforced Concrete Beams with Externally Bonded GFRP Sheets

2014 ◽  
Vol 919-921 ◽  
pp. 115-118
Author(s):  
Hai Ying Hu ◽  
Yu Cheng Zhang ◽  
Zhong Ming Huang
Keyword(s):  
Experimental Study ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Strengthening Effect ◽  
Rc Beams ◽  
Reinforced Plastics ◽  
Glass Fiber Reinforced ◽  
Bending Resistance ◽  
Externally Bonded ◽  
Fiber Reinforced Plastics

A test of bending resistance and reinforcement is carried out on RC beams by applying sheet of glass fiber reinforced plastics (GFRP). A study and analysis is given to the traits of bending and rupture of RC beams reinforced by applying GFRP and to the effect of GFRP on ultimate bearing capacity and stiffness of the beams. The strengthening effect is investigated to give guidance in practice work.

Experimental Study of Strengthening of Reinforced Concrete Beams with Externally Bonded GFRP Sheets

2013 ◽  
Vol 790 ◽  
pp. 333-336
Author(s):  
Hui Kang Liu ◽  
Ze Fan ◽  
Yu Cheng Zhang
Keyword(s):  
Experimental Study ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Strengthening Effect ◽  
Rc Beams ◽  
Reinforced Plastics ◽  
Glass Fiber Reinforced ◽  
Bending Resistance ◽  
Externally Bonded ◽  
Fiber Reinforced Plastics

A test of bending resistance and reinforcement is carried out on RC beams reinforced by applying sheet of glass fiber reinforced plastics (GFRP). A study and analysis is given to the traits of bending and rupture of RC beams reinforced by applying GFRP and to the effect of GFRP on ultimate bearing capacity and stiffness of the beams. The strengthening effect is investigated to give guidance in practice work.

scholarly journals Shear Behaviors of RC Beams Externally Strengthened with Engineered Cementitious Composite Layers

Materials ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2163 ◽  
Author(s):  
Guan Wang ◽  
Caiqian Yang ◽  
Yong Pan ◽  
Fawang Zhu ◽  
Kai Jin ◽  
...  
Keyword(s):  
Shear Strain ◽  
Middle Part ◽  
Strengthening Effect ◽  
Arch Model ◽  
Rc Beams ◽  
Cementitious Composite ◽  
Shear Strengthening ◽  
Engineered Cementitious Composite ◽  
Fbg Sensors ◽  
Shear Behaviors

The shear behaviors of reinforced concrete (RC) beams externally strengthened with engineered cementitious composite (ECC) layers were studied and the strengthening effect was evaluated based on a truss and arch model. The beams were designed without web reinforcement in the middle part and ECC was sprayed onto both sides of the beams to the designed thicknesses, which were 20 mm and 40 mm. A series of four-point bending experiments were conducted and analyzed. The development of the shear strain in each side of the beams was recorded by strain rosettes formed with three fiber Bragg grating (FBG) sensors. The thickness of ECC layers, reinforcement ratios, and shear span-to-depth ratios were considered and analyzed. This is an effective way to shear strengthen RC beams with ECC layers. The ultimate load of the strengthened specimen can be improved by 89% over the control specimen. Strengthening an RC beam into an under-reinforced beam should be avoided. The FBG sensors are suitable to measure and monitor the development of shear strain in the side of the strengthened specimen. Based on the truss and arch model, an evaluation of the shear strengthening effect was established and the results agree well with the experimental results.

scholarly journals Experimental Study on Shear Strengthening of RC Beams with an FRP Grid-PCM Reinforcement Layer

2019 ◽  
Vol 9 (15) ◽  
pp. 2984 ◽  
Author(s):  
Rui Guo ◽  
Lianheng Cai ◽  
Shinichi Hino ◽  
Bo Wang
Keyword(s):  
Evaluation Method ◽  
Cement Mortar ◽  
Effective Strain ◽  
Shear Capacity ◽  
Fiber Reinforced Polymer ◽  
Strengthening Effect ◽  
Rc Beams ◽  
Shear Strengthening ◽  
Reinforced Polymer ◽  
Series Of Experiments

This paper investigates the shear strengthening effect of a number of reinforced concrete (RC) beams strengthened by a reinforcement layer which combines carbon fiber reinforced polymer (CFRP) grid and polymer cement mortar (PCM). A total of ten RC beams, including three types of specimens as Series A and seven kinds of specimens as Series B, were prepared and investigated. The test variables in both series of experiments included various reinforcement ranges and different reinforcement amounts that consisted of CFRP grids’ spacing and cross-section areas. The experimental results suggest that the shear strengthening effect of the CFRP grid-PCM layer for RC beams is obvious and adequate. Meanwhile, better performance is observed if the CFRP grid-PCM reinforcement layer is used for the full sectional reinforcement of RC beams with an I-shaped profile, in contrast to RC beams with reinforcement of the web only. In addition, a new evaluation method based on the effective strain of the CFRP grid is developed to determine the shear capacity of RC beams strengthened by a CFRP grid-PCM layer.

Sign in / Sign up

Export Citation Format

Share Document