Efficacy Of Strengthening R.C. Beams to resist Shear

Beams are considered as one of the most loaded concrete elements, which needs to be strengthened either as a result of insufficient of concrete section, or insufficient rebar or increased loads, or the result of a superficial steel or corrosion of internal steel reinforcement, and other reasons that we will mention them what we need to study this. The damaged structural elements and their inability to function fully as a result of exposure to different environmental factors damage materials and lead to lower resistance, or because of the existence of of an executive defects or inappropriate investment for its, leads to the need to rehabilitate maintenance and repair or reinforcement. So it was resorting to strengthen either magnify sections or supply necessary reinforcement or steel platelets linking external supported well to concrete section, and because of the difficulty of execution the recent studies has been implemented on the use of more efficient material which is concentrated fiber reinforced polymers. We will present here to methods of strengthening the shear up to the global studies conducted using these materials from polymers, which are characterized by high resistance to tensile and large resistance to environmental factors and weather conditions and ease of application in the specified permissible sites.

Studying the effect of cross section shape on shear resistance of high strength concrete T beams, and developing a relationship to compute it´s shear

Using high strength concrete made a big step in designing and constructing reinforced concrete structures. In this research, shear resistance of high strength concrete beams with average resistance of (65Mpa) and without shear reinforcement was calculated by making Experimental tests, also we studied the effect of cross section shape on shear resistance, and measured the deflection in the middle of the beams then we compared these results with the mathematical results and with results from other researchers, finally we developed a relationship to determine shear capacity in high strength concrete T beams.

Study of the shear strength equations of reinforced concrete beams with and without steel fibers and suggestion an equation to the case of lightweight concrete

This paper presents the shear behavior of lightweight concrete beams without shear reinforcement produced by scoria aggregates. A total of nine beams were tested under four-point loads, including three lightweight concrete beams without steel fibers and six steel fiber reinforced lightweight concrete beams.

Effect of metal type and surface treatment on shear bond strength of resin cement (in vitro study)

Background Resin bonded fixed partial dentures appeared to prevent the excessive preparation of dental tissue Investigation of surface treatments to improve the bond of resin cements to metals may contribute to the longevity of these restorations. Due to the potential lack of ideal preparation form the type of alloy and its surface pretreatment may have clinically relevant correlations with the retentive strength of castings to minimally retentive preparations Aim The aim of this search is to study the bonding resin cement strength to different types of the metal alloy due to the surface treatment Purpose Evaluate the effects of two different surface treatments on shear bond strength SBS between a palladium silver alloy Pb Ag and commercially pure titanium CP Ti cast alloy with resin luting cements