Numerical Study on Flexural Behavior of Concrete Beams Strengthened with Fiber Reinforced Cementitious Matrix Considering Different Concrete Compressive Strength and Steel Reinforcement Ratio

Abstract

Concrete structures retrofitted with fiber reinforced cementitious matrix (FRCM) have become widespread due to their mechanical and durability performances. However, the behavior of FRCMstrengthened RC members under service loads is still a concern, and more efforts need to be done. In this study, a nonlinear three-dimensional finite element (FE) model has been developed to study the performance of reinforced concrete (RC) beams strengthened by (FRCM). The model was validated against the experimental results gathered from six beams tested under three-points bending. Consequently, the primary numerically studied parameters were longitudinal steel reinforcement ratio and concrete compressive strength. A cohesive damage parameters were investigated to represent the experimental results. Also, the theoretical flexural capacity of strengthened beams based on ACI-549.4R code was evaluated based on the numerical method results. As a conclusion, the numerical results are in a very good agreement with the experimental ones regarding yielding load, ultimate load, and failure mode. In addition, the developed models from parametric studies concluded the insignificant effect of concrete compressive strength on increasing the ultimate capacity of strengthened beam. However, the steel reinforcement ratio has a major impact on enhancing the ultimate capacity of strengthened beams.

Flexural Strength and Behavioral Study of High-Performance Concrete Beams using Stress-Block Parameters

“…The HPC beams are rectangular in crosssection having width of 150mm and effective length of A total of 12 beams as detailed in Table 1 of single span were cast by varying percentage of longitudinal tension steel, for three compressive strengths of concrete. In order to develop pure flexural behaviour in the beam section, stirrups are not provided between sections having constant moment [15][16][17]. These beams are grouped as 60SB1, 60SB2, 60SB3 and 60SB4 indicating M60 HPC beams, 80SB1, 80SB2, 80SB3 and 80SB4 indicating M80 HPC beams, 100SB1, 100SB2, 100SB3 and 100SB4 indicating M100 HPC beams.…”

A Numerical Study to Investigate Shear Behavior of High-strength Concrete Beams Externally Retrofitted with Carbon Fiber Reinforced Polymer Sheets

“…The steel rebars are assigned as embedded regions inside the host region of the concrete beam. The CFRP sheets are constrained as a tie between two surfaces, the master surface is the concrete beam, and the slave one is the sheet [22][23][24]. The interaction between steel plates and the concrete beam is a surface-to-surface contact type with two properties; tangential behavior with a friction coefficient of 0.45 and normal behavior of hard contact with no penetration between the adjacent surfaces.…”

Experimental and Numerical Investigation of the Impact of Basalt Fibers and Tie Spacing on Short Concrete Column Behavior

“…Chopped basalt fibers as short filaments collected in slices of 12 mm long and (16-18) μm diameter were utilized, as shown in Figure 3. Basalt fiber has a modulus of elasticity of (85-90) GPa, a density of 2800 kg/m 3 , and 3.2 % elongation at breaking [3]. Basalt fiber is an inert substance; it does not participate in chemical reactions [6].…”

“…Basalt fiber is a new natural fiber extracted from frozen lava of volcanic rocks gathered on the surface of the earth's crust [1][2][3][4]. Basalt fiber has high stability and insulating features [5,6].…”