Experimental resistance of slab-column connections with prefabricated truss bars as punching shear reinforcement

Ferreira, M. P.; Filho, Manoel J. M. Pereira; Freitas, Marcus V.P.; Neto, A. F. Lima; Melo, Guilherme S.

doi:10.1016/j.engstruct.2021.111903

Cited by 14 publications

(8 citation statements)

References 11 publications

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“…Following the implementation of these reinforcement techniques [32][33][34][35][36][37], there was a noticeable transition in the primary failure mechanism from direct crushing to bending. Additionally, certain strategies have been shown to combine bending with specifc localized crushing efects, as noted in earlier investigations [25][26][27]29].…”

Section: Introductionmentioning

confidence: 98%

“…Various methodologies and materials have been employed to enhance the durability of slabs under both static and dynamic loading conditions. Tese include shear studs [18], basalt fber-reinforced polymer (FRP) strips [19], hybrid fbers comprising hooked-end steel, polypropylene, and Kevlar [20], high-performance fber-reinforced cementitious composites (HPFRCCs) [21], prestressed concrete [22,23], ferrocement [24], internal anchorage stirrups [25][26][27], Wshaped stirrups [28], truss shear reinforcement [29][30][31], steel plates and slurry-infltrated mat concrete (SIMCON) laminates [32,33], polypropylene fber [33], geogrids [34], and carbon textiles [35]. Increasing the thickness of the slab has demonstrated efcacy in reducing damage and altering failure modes [36], while employing higher-grade concrete has shown some advantages in mitigating slab puncture [37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

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Anti-Impact Performance Enhancement of Two-Way Spanning Slab through the Implementation of Steel Trussed Bars

Al-Dala’ien,

Anas,

Kodrg

2024

Journal of Engineering

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Reinforced concrete (RC) slabs represent integral structural components extensively employed in architectural and infrastructural frameworks owing to their inherent robustness and longevity. In contemporary times, there has been a pronounced surge in endeavors aimed at comprehensively elucidating the anti-impact properties inherent in RC slabs. This surge is propelled by a compelling necessity to fortify these structures against the deleterious effects of low-velocity impacts, thereby ensuring their steadfastness and resilience. Consider the thorough investigation into the anti-impact characteristics of RC slabs, which has been rigorously pursued through both experimental and computational methodologies. A plethora of scholarly discourse on this topic is readily available, providing invaluable insights into the structural dynamics governing slabs subjected to low-velocity impacts. However, there is a noticeable gap in research concerning the strengthening of slabs through shear reinforcement, particularly through economical, easily fabricated, and efficient systems such as fabricated trussed bars. The primary objective of this study is to explore the structural behavior of RC slabs fortified with custom-designed trussed bars under the influence of low-velocity impacts. To accomplish this, the Abaqus software platform is explicitly employed for analysis. The slab without any shear reinforcement is experimentally tested and serves as a reference model for numerical verification. Its anti-impact performance is compared with numerical findings. Following validation, simulations are conducted for square slabs strengthened by fabricated trussed bars in orthogonal and diagonal layouts. The results demonstrate that employing fabricated truss bars shear reinforcement with a 3 mm diameter in orthogonal and diagonal layouts enhances the resistance of slabs to damage, resulting in a 28.41% and 47.06% decrease in damage, respectively. The utilization of engineered truss bars as shear reinforcement yields significant improvements in strength, rigidity, and ductility when compared to control samples lacking such reinforcement. This enhancement is particularly evident when the engineered truss bars are arranged in orthogonal and diagonal configurations.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Anti-Impact Performance Enhancement of Two-Way Spanning Slab through the Implementation of Steel Trussed Bars

Al-Dala’ien,

Anas,

Kodrg

2024

Journal of Engineering

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“…Ferreiraand Filho [17] used prefabricated truss bars and concluded that the predictions of ACI 318-19 [2], Eurocode 2 [4], and FIB Model Code 2010 [10] were safe and underestimated. Tareshet al [18] used steel angle plates and concluded that the results of ACI-318-19 [2] were underestimated and safe.Schmidtet al [19] used stirrups and concluded that Eurocode 2 [4] depended on concrete contribution and shear reinforcement but FIB Model Code 2010 [10] depended on concrete and steel contribution together.Deifalla [20] used GFRP,CFRP and concluded that calculations of CSA [21] design code were more accurate than JSCE-2010 [8], ACI318-19 [2] codes and safety factor of JSCE-2010 code [8] was safer than CSA [21] and ACI318-19 [2] codes.…”

Section: Introductionmentioning

confidence: 99%

PROPOSED CORRECTION FACTORS for PUNCHING SHEAR CAPACITY of RC FLAT SLABS with SHEAR REINFORCEMENT

ELGHIT

Mahmoud

El-Mahdy

et al. 2022

Engineering Research Journal - Faculty of Engineering (Shoubra)

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Punching shear is the main problem facing reinforced concrete (RC) flat slabs. There are many studies that investigate the punching shear of flat slabs in the normal cases, while there are very few studies that investigate circular flat slabs supported on circular columns. This paper investigates the effect of: (1) steel shear studs; (2) steel stirrups; (3) main reinforcement details and (4) shear reinforcement arrangement on the punching shear resistance of circular RC flat slabs. An experimental program was conducted by the authors and the obtained results are compared with the numerical results using ANSYS V. 15, as well as the analytical results using the American and the Egyptian codes of standards. The obtained results show that punching shear strength increased when using steel shear reinforcement (studs and stirrups) by 9% to 57%.Toughness and displacement ductility improved by 31% to 333% and 85 to 121%, respectively. Both codes overestimate the ultimate failure load for the range of the studied variables in this research and not in general.

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“…The results showed that the ultimate bearing capacity and cracking performance of SFRC slab–column connections were significantly improved compared to those of common RC slab–column connections. Ferreira et al (2021) developed the punching shear reinforcement formed by prefabricated truss, and general guidelines for design, detailing, and assembly of this reinforcement were presented. The results show that the slab with inclined prefabricated truss bars and the slab with stud rails had twice the strength and more than three times the deformation capacity of the slab without shear reinforcement.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the punching shear behaviors of reinforced concrete slab–steel reinforced concrete L-shaped column connections

Xue

Zhang

et al. 2022

Advances in Structural Engineering

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To study the punching behaviors of reinforced concrete (RC) slab–steel reinforced concrete (SRC) L-shaped column connections, four slab–column connection tests were designed and completed, and a new punching shear resistance measure proposed. The test variables were column section shape, slab thickness and column cap. The test results show that the failure mode of L-shaped column was mainly two-way shear. Meanwhile, increasing slab thickness and installing column cap can effectively improve the ultimate bearing capacity of the slab–column connection. The punching angles formed by the punching cone and horizontal direction at the final failure of the connection were between 23.5° and 49.5°. In addition, a numerical simulation analysis was carried out using ABAQUS software, and the effects of various parameters on the performance of slab–column connections were studied. It was found that the change of column section shape will lead to more complex shear stress distribution and stress concentration phenomenon. However, the punching capacity of the special-shaped column was higher than that of the equivalent square column with the same section area. As a new punching shear resistance measure, inverted T-shaped steel can effectively improve the ultimate bearing capacity of the connections. In addition, when the ratio of slab thickness to web width of inverted T-shaped steel was less than 0.75, the failure mode of the connection changed from brittle punching failure to flexural failure.

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Experimental resistance of slab-column connections with prefabricated truss bars as punching shear reinforcement

Cited by 14 publications

References 11 publications

Anti-Impact Performance Enhancement of Two-Way Spanning Slab through the Implementation of Steel Trussed Bars

Anti-Impact Performance Enhancement of Two-Way Spanning Slab through the Implementation of Steel Trussed Bars

PROPOSED CORRECTION FACTORS for PUNCHING SHEAR CAPACITY of RC FLAT SLABS with SHEAR REINFORCEMENT

Investigation of the punching shear behaviors of reinforced concrete slab–steel reinforced concrete L-shaped column connections

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