Behavior of high-strength concrete interior slab-column connections with openings under seismic loading

Yousef, Ahmed M.; El-Metwally, Salah El-Din E.; Askar, Hamed H.; El-Mandouh, Mahmoud A.

doi:10.1016/j.conbuildmat.2019.04.143

Cited by 10 publications

(2 citation statements)

References 2 publications

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“…In addition, the position of the opening plays a major role in determining the resulting strength and ductility reduction with respect to the maximum positive and negative moment regions [3][4][5][6][7]. It is recommended that RC slabs are designed based on the strip method, despite the lack of existing literature on this topic and the need for further investigations, as inadequate calculations and precise instruction can cause the strip method to underestimate the RC slab's load capacity [8]. Moreover, there is still some unclearness regarding how to determine the opening size that will not affect the slab's allowable load-carrying capacity [9].…”

Section: Introductionmentioning

confidence: 99%

NLFEA of the Behavior of Polypropylene-Fiber-Reinforced Concrete Slabs with Square Opening

Al-Rousan,

Alnemrawi

2024

Buildings

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The bending behavior of one-war reinforced concrete (RC) slabs with polypropylene fibers (PF) was examined in this study under the effect of different opening ratios using the nonlinear finite element analysis (NLFEA) method. The investigated parameters include the effect of different square opening ratios between 0 and 24% and PF volume percentages between 0 and 1% with 0.1% increments. The objectives of this study were fulfilled using 88 NLFEA models with different combinations of the studied parameters, including 11 control slabs without openings. The slab’s behavior was studied focusing on different structural performance characteristics, such as ductility, using energy-based and deflection-based approaches, stiffness (initial and yielding), cracking, and ultimate load strength. In addition, other structural performance parameters were considered, such as the crack opening, failure modes, and strain values, which were recorded for all specimens during the loading history. Moreover, the load-carrying capacity of the slabs was compared, looking at the NLFEA method’s results and the theoretical prediction results based on the sectional analysis method. However, it was observed that the inclusion of PFs of different percentages has a superior effect on the behavior of RC slabs with small openings (less than 2% opening ratio) compared to the acceptable improvements obtained for sabs with larger opening sizes. Consequently, PF could be utilized as a replacement for conventional steel rebars for RC slabs with small openings. In addition, increasing the PF percentage increases the resulting crack-opening value at failure due to the provided stabilization effect, in addition to increasing the system’s ability to sustain loads.

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Section: Introductionmentioning

confidence: 99%

NLFEA of the Behavior of Polypropylene-Fiber-Reinforced Concrete Slabs with Square Opening

Al-Rousan,

Alnemrawi

2024

Buildings

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“…Cheng et al [1]used Concrete-Filled Steel Tube (CFST) and steel plate to improve punching resistance of slabs according to ACI 318-19 [2].Using steel plate increased the value (Vpeak/fc 0.5 ) more than CFST column by 10-25%.Augustinet al [3] concluded that the best value for Vtest/VR.C ratio equal one to resistance punching shear according to Eurocode 2 [4]. Issaet al [5] concluded that ultimate load increased by 10% due to increasing compressive reinforcement ratio per Egyptian code ECP 203-2020 [6].Yousef et al [7] concluded that the . punching shear strength calculated using equations of JSCE-2010 [8] for High Strength Concrete (HSC) specimens were unsafe and for Normal Strength Concrete (NSC) specimens were safe.Ferreiraet al [9] tested flat slabs with unbalanced moments and concluded that Eurocode 2 [4] presented the better results while ACI318-19 [2] and FIB Model Code 2010 [10] showed over conservative results.…”

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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Retrofitting of reinforced concrete flat slabs with cut-out edge opening

Hussein

Jabir

Al-Gasham

2021

Case Studies in Construction Materials

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Behavior of high-strength concrete interior slab-column connections with openings under seismic loading

Cited by 10 publications

References 2 publications

NLFEA of the Behavior of Polypropylene-Fiber-Reinforced Concrete Slabs with Square Opening

NLFEA of the Behavior of Polypropylene-Fiber-Reinforced Concrete Slabs with Square Opening

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

Retrofitting of reinforced concrete flat slabs with cut-out edge opening

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