Issue 46

H. Zhu et alii, Frattura ed Integrità Strutturale, 46 (2018) 361-370; DOI: 10.3221/IGF-ESIS.46.33 362 a gradient prestressing technique without end anchorage plates and investigating confinement technique using nonlaminated thermoplastic CFRP straps. Raoof et al. [2] compared the flexural properties of Textile-reinforced mortar (TRM) versus fibre-reinforced polymers (FRP) and found that FRP was more superior in improving the flexural bearing capacity of reinforced concrete beams than TRM through experiments. To analyze the effect of CFRP in enhancing the carrying capacity of beams during bending, Khelifa et al. [3] developed a numerical program to simulate the bending behaviors of beams. Rezazadeh M et al. [4] designed an experimental procedure to evaluate the influence of prestress technology on the bending performance of the embedded CFRP plate consolidated reinforced concrete beams and found that prestressing could improve the load carrying capacity corresponding to the concrete cracking and steel yielding initiations. After reviewing the articles concerning about CFRP consolidated reinforced concrete beams and reinforced concrete slab, Jumaat et al. [5] put forward a simple CFRP reinforcement method to strengthen the negative moment regions of continuous T beams and attempted to address an important practical issue that is encountered in strengthening the negative moment region of RC continuous T beam. Dias et al. [6] studied the effect of CFRP in reinforcing reinforced concrete beams in aspects of the percentage and inclination of CFRP laminates and percentage of stirrups and found that embedded CFRP had better efficacy in strengthening reinforced concrete beams. In this study, the finite element analysis software ANSYS was used for simulation, and the simulated values were compared with the test values to verify the effectiveness of the model; moreover the stress performance of CFRP plates in different structures was also simulated using finite element model to analyze the influence of different number of CFRP plate, grooving mode and shear span ratio on beams and explore the best reinforcement way of embedded CFRP plate. E MBEDDED CFRP PLATE RP which is composed of fiber materials and resin is prone to be installed on irregular surface and has advantages of higher strength and strong corrosion resistance [7, 8]. It was found that the application of FRP can recover or improve the original strength of beams [9]. FRP can be divided into CFRP, glass fiber reinforced plastics (GFRP), aromatic polyamide fiber reinforced plastics (AFRP), etc. CFRP has stronger tensile and bending resistance compared to other materials. FRP reinforcement includes FRP surface pasting method and FRP embedded reinforcement. The procedures of embedded reinforcement are as follows. Firstly, concrete cover was grooved. After the dust in the groove was cleaned, half of the groove was filled with cementing material, for example, resin. Then FRP was added and pressed. Figure 1 : The schematic diagram of embedded reinforcement. FRP reinforcement can effectively strengthen the bending and shear resistance performance of reinforced concrete beams [10], which has many advantages compared to other reinforcement methods. Embedded FRP avoids contact with the outside world, i.e., reduce the influence of external environment on the performance of materials. The complete contact of FRP and binding materials reduces the possibilities of debonding failure. It is suitable for strengthening the negative moment region of structural components. When FRP reinforcement is used, the workload of processing concrete surface is light, saving time and cost. F