Numerical study using FE simulation on rectangular RC beams with vertical circular web openings in the shear zones

Sayed, Ahmed M.

doi:10.1016/j.engstruct.2019.109471

Cited by 17 publications

(16 citation statements)

References 14 publications

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“…Studies show alternatives to optimize the steel consumption of reinforcement in the opening region, mitigate the concrete stresses and cracks and propose more current calculation techniques than those already established by Leonhardt and Monnig [2] and Sussekind [3]. Research has been carried out, for example, by Shoeib and Sedawy [4], to understand the magnitude of mechanical damage in these beams; by El-Mar et al [5], to analyze the region where concrete cracks begin; by Sayed [6], to investigate the shear stresses along the beam; by Mansour [7], to understand the use of steel fibers in crack mitigation and stress dissipation, among others.…”

Section: Introductionmentioning

confidence: 99%

“…Similar research was presented by Mansour [7] and Ashour and Rishi [11], indicating that the RC beam mechanical capacity reduces as the openings approach the supports. Sayed [6] concluded that the opening size generates a more damaging structural consequence than the number of openings in the beams.…”

Section: Introductionmentioning

confidence: 99%

“…This paper aims to fill this gap. Under normal temperature conditions, Sayed [6], Herrera et al [8], Elsanadedy [9], Tsavdaridis et al [13] showed that openings tend to cause beam failure by shear, which contradicts research on beams without openings in case of fire, as Li et al [18], Gedam [19], Silva [20] and Xu et al [21], showing that failure of RC beams does not occur due to shear stresses. Design standards cannot predict all situations.…”

Section: Introductionmentioning

confidence: 99%

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RC beams with rectangular openings in case of fire

Bolina

Fisch

Silva

2023

Rev. IBRACON Estrut. Mater.

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Openings in reinforced concrete (RC) beams may be required due to building installations (electrical, water, etc.). They weaken its cross-sectional area and, in case of fire, can increase the thermal field of the structure. NBR 15200 does not consider this. The paper evaluated the influence of rectangular openings on the Fire Resistance Rating (FRR) of RC beams by the Simplified Method of NBR 15200. This method combines a non-linear thermal analysis (isotherms) with the evaluation of the flexural strength of the beams using a manual design calculation method. The thermal field were obtained by a thermal model solved by finite element analysis (FEA) with Abaqus software. Thermal parameters of NBR 15200 were used. This FRR was compared with equivalent beams without openings solved by the Tabular Method of NBR 15200. Twelve 60 cm high beams with different widths and dimensions of openings were studied. Beams with openings had a FRR up to 60 min lower than the equivalent beam without openings. The larger the size of the rectangular opening, the greater the mechanical degradation of the beam in fire. NBR 15200 Tabular Method proved to be unsafe in this case. Prescriptions for beams with openings must be shown in NBR 15200.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

RC beams with rectangular openings in case of fire

Bolina

Fisch

Silva

2023

Rev. IBRACON Estrut. Mater.

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“…Studies show alternatives to optimize the steel consumption of reinforcement in the opening region, mitigate the concrete stresses and cracks and propose more current calculation techniques than those already established by Leonhardt and Monning (1978) [2] and Sussekind (1984) [3]. Research has been carried out, for example, by Shoeib and Sedawy (2017) [4], to understand the magnitude of mechanical damage in these beams; by El-Mar, Sherbini and Sallam (2015) [5], to analyze the region where concrete cracks begin; by Chapter 73 Sayed (2019) [6], to investigate the shear stresses along the beam; by Mansour (2021) [7], to understand the use of steel fibers in crack mitigation and stress dissipation, among others. Herrera et al (2017) [8] and Elsanadedy (2019) [9] showed that failure of RC beams with openings under normal temperature conditions predominantly occurs under excessive shear stresses.…”

Section: Introductionmentioning

confidence: 99%

Reinforced concrete beams with openings in fire

Bolina¹

2023

Development and Its Applications in Scientific Knowledge

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Openings in reinforced concrete (RC) beams may be required due to building installations (electrical, water, etc.). They weaken its cross-sectional area and, in case of fire, can increase the thermal field of the structure. NBR 15200 does not consider this. The paper evaluated the influence of rectangular openings on the Fire Resistance Rating (FRR) of RC beams by the Simplified Method of NBR 15200. This method combines a non-linear thermal analysis (isotherms) with the evaluation of the flexural strength of the beams using a manual design calculation method. The thermal field was obtained by a thermal model solved by finite element analysis (FEA) with Abaqus software. Thermal parameters of NBR 15200 were used. This FRR was compared with equivalent beams without openings solved by the Tabular Method of NBR 15200. Twelve 60 cm high beams with different widths and dimensions of openings were studied. Beams with openings had an FRR up to 60 min lower than the equivalent beam without openings. The larger the size of the rectangular opening, the greater the mechanical degradation of the beam in the fire. NBR 15200 Tabular Method proved to be unsafe in this case. Prescriptions for beams with openings must be shown in NBR 15200.

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“…It results in higher stress concentration, and the significant impact on the beam sectional stiffness, the bearing capacity, and the state of stress distribution around the opening region. [1][2][3][4][5][6] The existing tests mainly focused on the RC/PC beams with large openings, which were characterized by the failure mode of four plastic hinges that occurred at the corners of the opening (also identified as Vierendeel truss action by Mansur and Tan 7 and shown in Figure 1a). Abdalla and Kennedy 8 and Bertram 9 conducted the tests on three different cross-section forms of RC/PC beams with large openings, namely the rectangular, I-shaped, and T-shaped section.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on the shear behavior of prestressed concrete beams with small rectangular openings

Cai

Zuo

et al. 2020

Structural Concrete

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The numerical investigation focused on the shear behavior of prestressed concrete (PC) beams with small rectangular openings, using the software ABAQUS. Three variables, including the prestressing force, the height of the opening and its length, were considered. The numerical results exhibited a good agreement with the previous experimental outcomes, and the parametric analysis was conducted to study the local internal force distribution of two chords during the loading process. The results indicate that for RC beams with openings, the shear proportion variation of the top chord is stable as the opening size changes, while it decreases almost linearly with the increase of prestressing force for PC beams with openings. The position of contraflexure point is found to be proportional to the root of the reinforcement ratio of the chord, and it moves towards the support with the increase of the prestressing force. Furthermore, the empirical equations to determine the shear proportions and the position of contraflexure point between chords are established.

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Numerical study using FE simulation on rectangular RC beams with vertical circular web openings in the shear zones

Cited by 17 publications

References 14 publications

RC beams with rectangular openings in case of fire

RC beams with rectangular openings in case of fire

Reinforced concrete beams with openings in fire

Numerical investigation on the shear behavior of prestressed concrete beams with small rectangular openings

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