Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : flexural behavior

Flexural Performance of Concrete Beams Reinforced with Hybrid FRP-Steel Bars: A mini review

Marwah S. Abduljabbar; Wael S. AbdulSahib

Engineering and Technology Journal, 2023, Volume 41, Issue 5, Pages 1-10
DOI: 10.30684/etj.2022.135764.1284

Reinforced concrete beams are the most generally used structural parts in building, bridges, and many other structures. In the past two decades, many investigations have been conducted using various fiber-reinforced polymer (FRP) material types /steel bars to reinforce concrete beams under flexural test. The purpose of this paper is to review the flexural performance of concrete beams reinforced with hybrid FRP and steel bars to better understand their behavior. The main parameters addressed by researchers were dimensions of beams, FRP bar material type, and hybrid reinforcement ratio. The researchers established that the use of the combination between steel and FRP reinforcement bars improves the performance of the concrete beams. Moreover, the studies showed that the ductility of the hybrid reinforced beams increased compared to that of conventional steel reinforced beams, however, it decreased when the ratio of (Af/As) increased. The application of using hybrid FRP/steel bars in reinforcing concrete beams will further increase upon utilizing techniques for reducing the brittleness and higher cost of FRP bars. The general structure of this paper consists of presenting the formulas offered by ACI 440.1R-15 building code relating to the flexural strength calculation of concrete beams reinforced with FRP/steel bars. The paper also details some of the current experimental tests and analytical works published for concrete beams reinforced with hybrid system, and outlines research directions and identifies gaps required for additional research.

Sphrical Slab with Ferrocement

a A. Mohammed; Shayma

Engineering and Technology Journal, 2011, Volume 29, Issue 13, Pages 2609-2616
DOI: 10.30684/etj.29.13.3

This research is devoted to investigate the behavior of spherical ferrocement slabs under flexural loading. The main parameters considered in the analysis are the thickness of the slab, vertical and horizontal diameters, and the effect of number of wire mesh layers on the behavior of spherical. Analysis was done using the finite element software ANSYS V. 11, which is used for solving several problems of structural engineering. The 8-node iso-parametric brick elements in ANSYS are used to represent the mortar, the wire mesh layers are
considered as smeared layers elastic-perfectly plastic materials embedded within the
brick elements by assuming perfect bond between the mortar and steel.
An improvement was indicated in the behavior of the elements when changing the shape of the slab from straight to spherical slabs found in deflection about 64% (as indicated in ref. [1]). As well as increasing number of wire mesh layers from two to four and from two to six tend to increase the load capacity by 18% and 28% respectively.
The increase in the thickness and the vertical diameter cause decrease in deflection to 20% and 10% alternately.