Shear capacity of reinforced concrete deep beams

Authors
Citation
Af. Ashour, Shear capacity of reinforced concrete deep beams, J STRUC ENG, 126(9), 2000, pp. 1045-1052
Citations number
29
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Civil Engineering
Journal title
JOURNAL OF STRUCTURAL ENGINEERING-ASCE
ISSN journal
0733-9445 → ACNP
Volume
126
Issue
9
Year of publication
2000
Pages
1045 - 1052
Database
ISI
SICI code
0733-9445(200009)126:9<1045:SCORCD>2.0.ZU;2-V
Abstract
A mechanism analysis of shear failure of simply supported reinforced concre te deep beams is presented. Concrete and steel reinforcement are modeled as rigid perfectly plastic materials. The failure modes are idealized as an a ssemblage of rigid blocks separated by failure zones of displacement discon tinuity. The shear strength of deep beams is derived as a function of the l ocation of the instantaneous center of relative rotation of moving blocks. Minimization of the developed function gives the shear capacity of deep bea ms. Comparisons of the predicted shear capacity of numerous deep beams show good agreement with results obtained from experiments. A parametric study of main variables affecting shear strength of deep beams is conducted. The present model shows that the shear-span-to-depth ratio has more influence o n the shear capacity than the span-to-depth ratio and as the former increas es, the shear strength decreases. Increasing main longitudinal bottom reinf orcement increases the shear capacity up to a certain limit beyond which no shear strength improvement could be achieved. The relative effectiveness o f horizontal and vertical web reinforcement on the load capacity is mainly influenced by the shear-span-to-depth ratio; the deeper the beam, the more effective the horizontal web reinforcement and the less effective the verti cal web reinforcement.