“…The ability of specimens to disperse inelastic deformation energy is one of the most critical variables in determining their ductility. Mohammad Hassani et al [28,29] determined that the total dissipated energy was equal to the sum of the areas contained by the displacement. As depicted in Fig.…”
Self-compacting concrete (SCC) is one of the most recent high-performance concrete innovations. The behavior of self-compacted concrete deep beams reinforced with polypropylene fibers herein investigated. Within an experimental program comprising thirteen simply supported beams tested to failure. The parameters in perspective are polypropylene fiber ratios (0.0, 0.30, 0.60, and 0.90 %), vertical web reinforcement, and horizontal web reinforcement. Mid-span deflection, cracks, and strains are measured for each specimen. According to the test results, the polypropylene fibers improved the cracking load, ultimate capacity, displacement, and energy absorption of the tested SCC deep beams. A polypropylene fiber content of 0.90 % resulted in the most significant improvement as regards the performance of deep beams. The improvement in ultimate capacity reached a 30% magnitude compared to specimen B1. Test results showed that both vertical and horizontal web reinforcement are effective in enhancing the shear capacity of SCC deep beams. The test results were compared with the ACI design method to show the impact of web reinforcement ratio on deep beam load capacity.
“…The ability of specimens to disperse inelastic deformation energy is one of the most critical variables in determining their ductility. Mohammad Hassani et al [28,29] determined that the total dissipated energy was equal to the sum of the areas contained by the displacement. As depicted in Fig.…”
Self-compacting concrete (SCC) is one of the most recent high-performance concrete innovations. The behavior of self-compacted concrete deep beams reinforced with polypropylene fibers herein investigated. Within an experimental program comprising thirteen simply supported beams tested to failure. The parameters in perspective are polypropylene fiber ratios (0.0, 0.30, 0.60, and 0.90 %), vertical web reinforcement, and horizontal web reinforcement. Mid-span deflection, cracks, and strains are measured for each specimen. According to the test results, the polypropylene fibers improved the cracking load, ultimate capacity, displacement, and energy absorption of the tested SCC deep beams. A polypropylene fiber content of 0.90 % resulted in the most significant improvement as regards the performance of deep beams. The improvement in ultimate capacity reached a 30% magnitude compared to specimen B1. Test results showed that both vertical and horizontal web reinforcement are effective in enhancing the shear capacity of SCC deep beams. The test results were compared with the ACI design method to show the impact of web reinforcement ratio on deep beam load capacity.
“…Partial replacement of normal aggregate by polystyrene beads results in LWC with the benefits of maintaining a reasonable strength, reduced the overall weight of the LWC test beams by approximately 30% compared to their counterparts of NWC beams, low price, and good insulation of polystyrene [Shaaban et al, 2020;Vishakh and Vasudev, 2018 ]. This is necessary as the use of LWC is increasing day-by-day and the weaker aggregates and interfacial zone of LWC is susceptible for crack propagation and widening (Newman & Owens, 2003).…”
Lightweight concrete (LWC) is one of the most important building materials nowadays. Many research studies were focused on LWC produced using lightweight aggregates. However, limited work was cited for LWC produced using polystyrene beads. In this study, LWC beams strengthened with carbon fibre reinforced polymer (CFRP) and glass fibre reinforced polymer (GFRP) were experimentally tested to investigate the improvement in their flexural and shear behaviours. LWC in this investigation was achieved by partial replacement of normal aggregate by polystyrene beads and resulted in approximately 30% less weight compared to Normal weight concrete. Fourteen Reinforced Concrete (RC) LWC beams of 100 mm by 300 mm cross section having an overall length of 3250 mm were tested under four-point bending. These beams were designed, detailed, and tested to obtain flexural and shear mode of failure. These beams were divided into two groups based on the intended failure mode. In each group, six beams were strengthened using CFRP and GFRP laminates, while the remaining one beam was used as control. The tested parameters were the type of FRP, the width of the laminates used in shear strengthening, and the number of layers used in flexural strengthening. It was found that strengthening of LWC beams using CFRP and GFRP layers resulted in increasing the loading capacity and decreasing deflection as compared to control. The strengthening with CFRP and GFRP is also suitable in reducing the crack width and crack propagation which is more significant in LWC beams. The experimental results were also compared with the expressions in codes for forecasting the strength of LWC beams and it was that these expressions are compatible with the experimental results.
“…(3) critical shear crack theory (CSCT). In addition, shear studies in terms of types of concrete include, but are not limited to, lightweight concrete (LC), ultra-high-performance concrete (UHPC), and fiber-reinforced concrete (FRC) have been documented (Deifalla et al, 2020b;Tong et al, 2020;Ababneh et al, 2020;Shaban et al, 2020;Ridha et al, 2018).…”
Section: Introductionmentioning
confidence: 99%
“…Several theories are being used for the analysis of specimens under shear (ASCE-ACI, 1999; Cavagnis et al, 2020; Bentz et al, 2006; Muttoni et al, 1997), namely, (1) modified compression field theory (MCFT); (2) simplified modified compression field theory (SMCFT); and (3) critical shear crack theory (CSCT). In addition, shear studies in terms of types of concrete include, but are not limited to, lightweight concrete (LC), ultra-high-performance concrete (UHPC), and fiber-reinforced concrete (FRC) have been documented (Deifalla et al, 2020b; Tong et al, 2020; Ababneh et al, 2020; Shaban et al, 2020; Ridha et al, 2018). Figure 1.Reinforced concrete under shear loading a) failure cracking pattern and b) resistance mechanism (ASCE, 1999).…”
Section: Introductionmentioning
confidence: 99%
“…Since LC has a significantly lower weight, better insulation, and more ductility than normal-weight concrete (NC), its use and popularity word wide has been on the increase (Tong et al, 2020; Ababneh et al, 2020; Shaban et al, 2020; Ridha et al, 2018; ACI213R, 2014). However, much less is known about the shear strength of LC compared to NC.…”
Lightweight concrete (LC) is a viable alternative for conventional normal weight concrete (NC). It has a reduced weight and similar properties. However, shear provisions design codes are way behind for the case of the LC compared to the NC. This study evaluates the shear design of NC and LC specimens. First, an extensive experimental database of these specimens under shear was compiled. Then, selected shear provisions of design codes were outlined and applied for strength calculations. The calculated strengths were evaluated considering the experimentally measured ones to assess these design codes' overall accuracy and consistency. In addition, the effect of selected parameters (depth, concrete strength, flexure reinforcement ratio, shear span to depth ratio, and nominal maximum aggregate size) on the safety of the design was assessed. The third draft of the Eurocode was the most accurate and consistent for the shear design of LC and NC specimens. Finally, the Eurocode shear provisions draft was adapted, refined, verified, and proposed for the shear design of LC beams and slabs.
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