Investigation of Confinement Effects In Compression Zone On Simply Supported Concrete Beam Behavior

  • Assim Mohammed Lateef, Karrar Emad Nayif
Keywords: Confinement in the compression zone, Over reinforced sections, Ductility, Lightweight concrete.

Abstract

This research study the behaviour of confinement effect in the region of compression simply supported lightweight concrete beams to improve the beams' ductility.The lightweight concrete was obtained by replacing the normal coarse aggregate with thermostone after making the sieve analysis process.

Confinement is one method used to increase the structural efficiency of reinforced concrete, mainly related to ductility.Almost all codes of design limited the percentage of tensile reinforcement in reinforced concrete beams to prevent brittle compression failure. Although, a large proportion of steel reinforcement has been utilized in order to reduce the depth of structure and also still to give proper stiffness. In the last few years, the building industry has had important enhancements that require over-reinforced sections in massive projects like bridges and high elevation buildings. This research uses three kinds of confinement, rectangular ties, helix steel reinforcement and helix carbon fiber. The experimental program consists of casting and testing of seventeen beams, including two control beams under a two-point load. All beams had the same geometry and reinforcement. All specimens had the same dimension 150 mm (width) × 200mm (depth) × 1400 mm (length). The parameters involved the spacing of the ties in the compression region, helical pitch, confinement diameter and compressive strength of concrete.The test results showed a substantial increment in ductility for beams that are confined in the compressed region compared with the beams without confinement. The ductility of tested concrete beams increases with the decrease in confining spacing and increase the confining diameter. The helix steel reinforcement confinement produces higher ductility than rectangular ties for the same confinement interval. The use of carbon fiber confinement not yet significantly affect increasing the ductility of the beam.

Published
2021-09-12
How to Cite
Karrar Emad Nayif, A. M. L. (2021). Investigation of Confinement Effects In Compression Zone On Simply Supported Concrete Beam Behavior. Design Engineering, 11376-11393. Retrieved from http://www.thedesignengineering.com/index.php/DE/article/view/4251
Section
Articles