Predicting the shear–flexural strength of slender reinforced concrete T and I shaped beams

Simplification and verification of dual potential capacity model for reinforced concrete beams subjected to shear

“…The flange to web width ratio ( b f / b w ) of the test specimens varied from 1.0 (i.e., rectangular section) to 10.0 (i.e., a wide flange), and their shear span–depth ratio ( a / d s ) was 3.5. It is shown that the shear strengths of the test specimens increased to the b f / b w ratios of 2 or 3, as explained by Cladera et al The detailed DPCM estimated, however, that the shear strengths of the T‐shaped specimens increased as the flange width ( b f ) increased far beyond the b f / b w ratio of 3. These specimens had shear reinforcement and a relatively large amount of longitudinal reinforcement, and thus the shear demand to be resisted by the tension side ( V ci,req ) in the detailed DPCM was reduced while the shear demand to be resisted by the uncracked compression side ( V cc,req ) increased.…”

“…Thus, the actual flange width of the test specimens ( b f ) was used in the calculations by the proposed models. Note that Cladera et al proposed the effective flange width as b w + 2 t f for T‐shaped beams, and Tureyen and Frosch proposed the funnel‐shaped effective flange width as shown in the lower left corner of Figure a. When no consideration of the effective flange width is given, the model proposed by Tureyen and Frosch greatly overestimated the shear strengths of the specimens with a compression flange.…”

Influence of flanges on the shear‐carrying capacity of reinforced concrete beams without web reinforcement

“…The beneficial effects of the compression flange of a T‐beam on the shear strength of members without transverse reinforcement is well acknowledged since early concrete research and has particularly been investigated since the 1970s . On that basis, several authors have published different approaches to assess the increase of shear strength due to the compression flange in a T‐beam with simple design equations . Most of these approaches deal with a shear‐effective area, assuming that the area of the flange effective for increasing the shear strength is only uncracked and closer to the web.…”

“…Most of these approaches deal with a shear‐effective area, assuming that the area of the flange effective for increasing the shear strength is only uncracked and closer to the web. Figure summarizes some relevant approaches of the shear‐effective area of the compression chord in T‐beams . In most cases, the shear strength of the element is the result of multiplying this shear‐effective area by an average nominal shear stress.…”

“…Different approaches to shear‐effective area of the compression chord: (a) Leonhardt, (b) Placas et al and Cladera et al, (c) Zsutty, (d) Moayer and Regan, (e) Swamy and Qureshi, (f) Zararis et al, (g) Tureyen et al, and (h) Ribas et al …”