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

Hussein, Mohammed J.; Jabir, Hussain A.; Al-Gasham, Thaar S.

doi:10.1016/j.cscm.2021.e00537

Cited by 5 publications

(1 citation statement)

References 34 publications

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“…In contrast, slabs with small-size openings could maintain their behavior and internal stability [1,2]. 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].…”

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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Flexural behavior of cold‐formed U‐shaped steel members encasing concrete composite beam using continues stud bolts

Al‐Lami,

Jabir,

Shamsaldeen

et al. 2024

Structural Concrete

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The current paper presents an innovative form of the cold‐formed U‐shape steel encasing concrete composite beam (CUCB). The suggested CUCB consists of a cold‐formed U‐shaped steel encasing plain concrete beam which are connected to each other using continuous transversal threaded stud bolts. The experimental program consisted of eight beam specimens tested in the four‐point bending set‐up. One of them was a normal reinforced concrete beam and considered as a reference specimen while the remaining specimens were CUCB specimens without ordinary flexural and shear reinforcement. Four parameters were studied in this paper: (i) the thickness of the U‐shaped steel, (ii) the spacing between the stud bolts, (iii) the arrangement of the bolts, and (iv) the number of the bolt's rows. Results indicated an overall improvement in the load‐carrying capacity and stiffness of most CUCB specimens in comparison with the reference specimen. It was found that the using of three rows of bolts can significantly improve the ductility and toughness of the CUCB specimen in comparison with two rows of bolts. On the contrary, an increase in the bolt spacing entails a decrease in the CUCB specimens' toughness.

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Openings effects on the structural behavior of interior voided slab-column connections: An experimental study

Hammood¹,

Esfandiari²,

Movahednia³

et al. 2023

Case Studies in Construction Materials

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

Cited by 5 publications

References 34 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

Flexural behavior of cold‐formed U‐shaped steel members encasing concrete composite beam using continues stud bolts

Openings effects on the structural behavior of interior voided slab-column connections: An experimental study

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