Crack Width and Load-Carrying Capacity of RC Elements Strengthened with FRP

Figure 6

Stress distribution diagrams for concrete in compression: (a) curvilinear: 1—ascending part, 2—descending part; (b) strains in the cross-section; (c) curvilinear concrete’s compressive zone stress diagram and centroids of its parts: c—whole stress diagram, c₁—ascending part, c₂—constant (rectangular) part, c₃—separated part from rectangular by curved descending line, and x_c, x_c1, x_c2, and x_c3—the coordinates of centroids of stress diagram parts; and (d) rectangular stress diagrams: 3—equivalent and 4—inequivalent [30].