Effect of axial stiffness and area of main tension reinforcement on behavior of deep beams

  Mahmoud Hosny Mahmoud Soghair,  Ali Gamal Abd elshafy,  Mouhamed Mahmoud Ahmed,  Mohamed Fathy Fahmy

Strut-and-tie, modeling is one of the most important methods in analysis and design of structural concrete members which had discontinuity regions such as deep beams. Strut-and-tie models consist of struts and ties connected at nodes to form an idealized truss. When we design deep beams, the forces of truss shall be calculated, so we can also calculate the stresses in the different elements. The force of tie should not be exceeded 75 % of the force which can be carried by reinforcement before yielding occur. From this point, view increasing the area of tie reinforcement is assumed to have no effect on the beam as long as it is greater than once and a third the area in which the tie is needed. But increasing the area of reinforcement is followed by an increase in the local stiffness of tie, which in turn may reflect on the behavior of the deep beam. Eight beams were analyzed Numerically by using associated program to know the effect of increasing the rigidity of tie area on the behavior of struts in deep beams. Moreover, a new technique has been proposed to strengthen the beams to reduce the stresses in struts. It was concluded that using a tie with high axial stiffness has a significant effect on the induced of stresses and strains through the struts and tie.

Keywords- Deep beams, strengthening, local stiffness , strut, main steel ratio.

Unique Identification Number - IJEDR1904098
Page Number(s) - 547-553
Pubished in - Volume 7 | Issue 4 | December 2019
DOI (Digital Object Identifier) -   
Publisher - IJEDR (ISSN - 2321-9939)

  Mahmoud Hosny Mahmoud Soghair,  Ali Gamal Abd elshafy,  Mouhamed Mahmoud Ahmed,  Mohamed Fathy Fahmy,   "Effect of axial stiffness and area of main tension reinforcement on behavior of deep beams", International Journal of Engineering Development and Research (IJEDR), ISSN:2321-9939, Volume.7, Issue 4, pp.547-553, December 2019, Available at :http://www.ijedr.org/papers/IJEDR1904098.pdf