Mohamed Hassan

• BSc, MS, PhD
• Université de Sherbrooke

Flat plates are widely used in reinforced concrete (RC) structures due to their functional and economic advantages. Their design is usually governed by the punching shear stress surrounding the slab-column connections. In seismic zones, slab-column connections must possess adequate strength and ductility to undergo inelastic deformations without fa...

In recent decades, FRP reinforcing bars have been widely used in construction applications as internal reinforcement in concrete members. However, the feasibility of using FRP bars as internal reinforcement in seismically active regions has become called into question. Moreover, CSA S806-12 and ACI 440.1R-15 do not include any requirements concerni...

This study extends an extensive research program carried out at the University of Sherbrooke to design and assess the potential use of rectangular, concrete-filled fiber-reinforced-polymer tube (CFFT) beams post-ten­sioned with steel tendons in bridge applications. This paper describes research to enhance the flexural perfor­mance of post-tensioned...

This paper presents the test results of an experimental study aimed at investigating the flexural behavior of prestressed high and normal strength concrete filled fibre-reinforced polymer (FRP)- rectangular tubes (CFFT) beams. Two unbonded post-tensioned (PCFFT) beams were constructed with different concrete compressive strength ranged from 40 to 7...

Glass fiber-reinforced polymer bars (GFRP) have recently gained wide acceptance as a viable construction material for sustainable new constructions due to their costing less than other FRP types. Punching shear failure in concrete slab-column edge connections (SCE-connections) entirely reinforced with GFRP bars can be eliminated by installation of...

Applications of glass fiber-reinforced-polymer (GFRP) bars as reinforcement for concrete structures have been growing in recent years. This paper presents test results from an experimental program conducted to study the punching-shear response of edge slab-column connections (ESC-connections). Two full-scale reinforced concrete (RC) ESC-connections...

The use of fiber-reinforced polymer (FRP) bars as internal reinforcement for concrete structures in aggressive environments has emerged as an innovative solution to eliminate corrosion problems. Glass FRP (GFRP) reinforcing bars have recently gained wide acceptance as a viable construction material for sustainable new constructions due to their cos...

When used as an internal reinforcement, fiber-reinforced-polymer (FRP) composite bars are exposed to a highly alkaline (pH > 12.5) concrete environment. This study evaluated the durability of 24 types of FRP bars in a simulated alkaline concrete environment, specifically with respect to reinforcing-fiber type (carbon, basalt, and glass), fiber sizi...

Glass-fiber-reinforced-polymer (GFRP) reinforcing bars have recently gained wide acceptance as a viable construction material for sustainable new constructions. Yet current codes and guidelines have not addressed the design of GFRP-reinforced-concrete edge-slab–column connections with FRP stirrups as shear reinforcement. This paper summarizes the e...

This paper presents the results of an experimental study aimed at evaluating the effect of important design parameters on the flexural behavior of unbonded post-tensioned rectangular concrete-filled fiber-reinforced-polymer (FRP) tubes (CFFTs) beams. Four full-scale beams were constructed and tested to failure in four-point bending over a simply su...

In flat plates, the use of high-strength concrete (HSC) in the slabs, and the presence of shear reinforcement in the vicinity of columns are considered effective, economical, and practical solutions for enhancing the punching shear performance of slabs. This paper presents the first-ever experimental results for interior concrete slab–column connec...

The feasibility of using fiber-reinforced polymers (FRPs) as internal reinforcement for a totally reinforced concrete (RC) structure immune to corrosion essentially pertains to strength, stiffness, and deformation capacity in resisting seismic loads has become ques- tionable. Nevertheless, no experiments have yet been conducted on the punching-she...

Recent years have seen a great interest in testing concrete slab column connections reinforced with glass fiber-reinforced polymer bars (GFRP-RC). Yet, current fiber-reinforced polymer (FRP) codes and guidelines have not addressed the design of slab-column connections with FRP shear reinforcement. Results from an experimental investigation aimed at...

This paper presents an experimental investigation aimed at evaluating the effectiveness of glass-fiber-reinforced-polymer (GFRP) stirrups as shear reinforcement in GFRP edge slab–column connections. Three full-scale GFRP edge slab–column connections were tested under combined vertical shear force (V) and unbalanced moment (M) with (M/V) ratio equal...

One of the most important fields of research dealing with the use of carbon-, basalt-, and glass-fiber composites in the civil construction industry is their behavior under various chemical exposure conditions. Fiber-reinforced-polymer composites used as internal and external reinforcement in various structural applications can be subjected to wide...

The concept of concrete-filled fiber-reinforced polymer (FRP) tubes (CFFTs) is promising for a variety of structural applications and a good alternative for innovative constructions because of numerous attractive features, including durability and concrete confinement. An extensive research work was conducted on circular (CFFT) with and without int...

Infrastructure safety, durability, and serviceability have been significantly enhanced as a result of improved construction materials over the past two decades. Concrete-filled fibre-reinforced polymer (FRP) tubes (CFFTs) system is one of the most promising technique to protect the reinforced concrete structures from aggressive environmental condit...

This paper presents the test results of an experimental study aimed at investigating the behavior of concrete-filled fiber-reinforced-polymer (FRP) tube (CFFT) long columns internally reinforced with longitudinal steel or carbon and glass FRP bars tested under axial compression loading. A total of ten reinforced concrete (RC) and CFFT columns measu...

This paper presents an experimental study that investigated the physical, mechanical, and durability characteristics of a new generation of basalt-fiber-reinforced polymer (BFRP) reinforcing bars used as nonprestressed reinforcement for concrete structures. Two different diameters (12 and 16 mm) of deformed BFRP bars were investigated. The BFRP spe...

This paper evaluates the accuracy of the available punching-shear equations for fiber-reinforced polymer (FRP) and steel reinforced edge slab-column connections without shear reinforcement. A database was populated with results from 13 FRP and 25 steel reinforced edge slab-column prototypes in the literature. The accuracy of the design equations wa...

This paper presents the test results of an experimental study aimed at investigating the bond strength durability of BFRP bars embedded in concrete when exposed to accelerated environmental effects. The experimental program included testing and investigating BFRP deformed bars with 12-mm diameter. Pullout specimens were tested under direct tensile...

In this paper, a new design model is proposed for estimating punching shear capacity of fiber-reinforced polymer (FRP)-reinforced two-way slabs without shear reinforcement. This model is based on the statistical analysis of 69 laboratory experiments from slabs subjected to shear only or a combination of shear and unbalanced moment. The database use...

The use of basalt fiber–reinforced polymer (BFRP) bars as a reinforcing material for concrete structures has gained increasing interest worldwide. Limited studies have been reported on the performance of BFRP bars in concrete when exposed to harsh environments. This paper presents the test results of an experimental study aimed at investigating the...

This study presents a new design formula for estimation of the punching shear capacity of interior fiber reinforced polymer (FRP) reinforced slab-column connections that were developed based on extensive experimental work at the University of Sherbrooke. The formula takes into account the effects of the axial stiffness of main reinforcement, the ra...

This paper presents an experimental study that investigated the physical, mechanical, and durability characteristics of a new generation of basalt-fiber-reinforced polymer (BFRP) reinforcing bars used as nonprestressed reinforcement for concrete structures. Two different diameters (12 and 16 mm) of deformed BFRP bars were investigated. The BFRP spe...

The Fiber Reinforced Polymer properties include high strength-to-weight ratio, high stiffness-to-weight ratio, high-energy absorption, and outstanding corrosion and fatigue damage resistance. Therefore, the use of continuous basalt, glass, and carbon fiber reinforcement in concrete structural applications seems to be promising for reinforcing new c...

This study investigated the punching shear behavior of two-way concrete slabs with glass-fiber-reinforced polymer (GFRP) bars as flexural reinforcement and FRP stirrups (glass or carbon) as shear reinforcement. A total of 10 full-scale interior slab-column specimens measuring 2,500 × 2,500 mm, with thicknesses of either 200 or 350 mm, and 300 × 300...

This paper investigated the punching-shear behavior of two-way concrete slabs reinforced with glass fiber–reinforced polymer (GFRP) bars of different grades. A total of 10 full-scale interior slab-column specimens measuring 2,500×2,500 mm with thicknesses of either 200 or 350 mm and 300×300 mm square column stubs were fabricated with normal and hig...

This paper investigates the punching shear behavior of two-way flat slabs reinforced with glass fiber-reinforced polymer (GFRP) bars. A total of 17 full-scale interior slab–column specimens measuring 2500 mm × 2500 mm reinforced with GFRP and steel bars were constructed and tested under concentric loads until failure. The test parameters were: (i)...

Results from an experimental study aimed at investigating the behavior of full-scale two-way flat slabs reinforced with glass fiber-reinforced polymer (GFRP) bars and subjected to monotonically increased concentrated load are presented. A total of 10 interior slab-column prototypes measuring 2.5 x 2.5 m (98 x 98 in.) were constructed and tested up...

This preliminary study investigates the punching-shear behaviour of flat slabs reinforced in flexure and shear with FRP reinforcement. Three full-scale interior slab-column connections were constructed and tested under concentric loading until failure. The three specimens were reinforced in flexure with glass fiber-reinforced polymer (GFRP) bars. H...

The Canadian Standard Association provided its first punching-shear equation in the new edition of the CSA S806-11 which represented a step forward in designing the FRP-RC flat slabs and parking structures. This paper evaluates the accuracy of the available punching-shear equations for FRP-RC flat slabs. The accuracy of the design equations was ass...

This paper presents the test results of an extended research project aims to developing the FRP technology to two-way flat slabs and to introducing design guidelines for FRP-reinforced two-way flat slabs. A total of six full-scale two-way prototypes reinforced with GFRP and steel bars were constructed and tested to investigate their punching shear...