Effects of Non-Structural Walls on Mitigating the Risk of Progressive Collapse of RC Structures

Altheeb, Ali; Alshaikh, Ibrahim M.H.; Abadel, Aref A.; Nehdi, Moncef L.; Alghamdi, Hussam

doi:10.1590/1679-78257023

Cited by 17 publications

(6 citation statements)

References 19 publications

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“…The concrete damaged plasticity (CDP) model, widely employed in FE investigations (e.g., [31][32][33]), was utilized to predict the behavior of concrete and Sikadur resin mortar materials. The CDP model includes isotropic damaged elasticity and compressive and tensile plasticity to effectively represent the plastic responses [1].…”

Section: Constitutive Materials Modelsmentioning

confidence: 99%

Shear strengthening of deficient RC deep beams using NSM FRP system: Experimental and numerical investigation

Abadel

2024

Materials Science-Poland

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It is essential to retrofit deep beams with shear inadequacies because these beams, although they have the same shear and flexural reinforcements as ordinary beams, are more susceptible to shear failure. Hence, it is of great significance to overcome the shear weaknesses in deep beams. This research paper aims to experimentally examine the effectiveness of near-surface mounted (NSM) carbon fiber reinforced polymer (CFRP) for retrofitting reinforced concrete (RC) deep beams subjected to shear forces. The study involved three different types of specimens. The first specimen was constructed with concrete throughout its span and included shear stirrups. The second specimen was divided into two halves, with one half lacking shear reinforcements and the other half having them. The third specimen had steel web reinforcement in one half of the span, while the other half was strengthened using NSM CFRP U-wrap strips and externally bonded horizontal CFRP strips. The proposed strengthening method significantly increased the shear strength of the deep beams, surpassing that provided by steel web reinforcement alone. Furthermore, the NSM CFRP strengthened specimen exhibited a change in failure mode from shear to flexural failure. In comparison to the control beam without stirrups, the beams strengthened with NSM CFRP U-wrap strips demonstrated an impressive 82% improvement in shear strength, while the beam with shear reinforcement showed a 23 % enhancement in load capacity. The proposed strengthened scheme is capable of enhancing the structural performance and load-carrying capacity effectively. A finite element model was generated utilizing ABAQUS software to simulate the behavior of the tested deep beams and verified against the experimental outcomes. The numerical models successfully predicted the behavior of the RC deep beams strengthened with NSM CFRP when compared to the experimental data.

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Section: Constitutive Materials Modelsmentioning

confidence: 99%

Shear strengthening of deficient RC deep beams using NSM FRP system: Experimental and numerical investigation

Abadel

2024

Materials Science-Poland

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“…The concrete damaged plasticity model (CDP), which was available in ABAQUS software, was chosen to describe the concrete material performance which was commonly utilized in the FEM simulations (e.g., [43,44,49]). The CDP model can simulate the actual concrete behavior in compression and tension under external pressures.…”

Section: Modelling Of Concrete Materialsmentioning

confidence: 99%

“…The FEM simulation is superior in the progressive collapse field since the entire building can be modelled. The finite element (FE) models, which employ commercial programs, can more accurately and reliably simulate the performance of RC structures under impact and assist in investigating different design variables (e.g., [43,44]). Despite the rise in the quantity of scientific articles published, the majority of experimental and numerical studies undertaken focused on the effect of reinforcing rebars by increasing flexural reinforcement ratios, adding new rebar layers or changing the seismic reinforcing detailing of RC beams to prevent progressive collapse.…”

Section: Introductionmentioning

confidence: 99%

Progressive Collapse Resistance of RC Beam–Slab Substructures Made with Rubberized Concrete

et al. 2022

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Abnormal loads can produce localized damage that can eventually cause progressive collapse of the whole reinforced concrete (RC) structure. This might have devastating financial repercussions and cause numerous severe casualties. Numerical simulation, using the finite element method (FEM), of the consequences of abnormal loads on buildings is thus required to avoid the significant expenses associated with testing full-scale buildings and to save time. In this paper, FEM simulations, using ABAQUS software, were employed to investigate the progressive collapse resistance of the full-scale three-dimensional (3D) beam–slab substructures, considering two concrete mixes, namely: normal concrete (NC) and rubberized concrete (RuC) which was made by incorporating crumb rubber at 20% by volume replacement for sand. The FEM accuracy and dependability were validated using available experimental test results. Concrete and steel material non-linearity were considered in the FE modelling. The numerical study is extended to include eight new models with various specifics (a set of parameters) for further understanding of progressive collapse. Results showed that slabs contribute more than a third of the load resistance, which also significantly improves the building’s progressive collapse resistance. Moreover, the performance of the RuC specimens was excellent in the catenary stage, which develops additional resilience to significant deformation to prevent or even mitigate progressive collapse.

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“…In addition, traditional node-to-surface discretization, as well as the approach of the small sliding tracking has been adopted similar to study by Altheeb et al [36] to model interaction, which resulted from mortar located amid the block units. The interaction properties in this study were modeled via a normal behavior as a hard contact (i.e., no penetration of surfaces) and a tangential behavior by specifying the friction coefficients between the steel and concrete surfaces as 0.47 [37].…”

Section: Fem Modelling and Analysismentioning

confidence: 99%

Experimental and FEM Analysis for Fracture Performance Evaluation of Concrete Made with Recycled Construction and Demolition Waste Aggregates

Ojha

Singh²,

Singh³

et al. 2022

Period. Polytech. Civil Eng.

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Paper presents experimental and Finite Element Method (FEM) analysis of fracture behavior of concrete made using Recycled Aggregate (RA). Concrete mixes were prepared using Construction and Demolition Waste (CDW) as replacement of natural coarse aggregates. To study fracture performance, concrete mixes were prepared with water to cementitious content (w/b) ratios between 0.4 and 0.5. Beam specimens of size 100 mm x 100 mm x 500 mm were cast and tested as per method of Three-point bend test on notched beam proposed by RILEM. Fracture parameters like fracture energy, stress intensity factor, energy release rate and characteristic length were evaluated using Load-CMOD (Crack Mouth Opening Displacement) and load deformation curves. Mechanical properties of concrete such as compressive and flexural strength, modulus of elasticity and split tensile strength were also evaluated. The performance of concrete using RA has been compared with concrete using Natural Aggregate (NA) from literature. Results suggest slightly better fracture performance in case of concrete made using RA in comparison to conventional concrete in spite of having similar strength and w/b ratio. Fracture energy parameter in terms of stress intensity factor obtained from FEM analysis were similar to experimental results wherein no significant variation in stress intensity factor for concrete mixes with recycled and natural aggregate were observed. However, it can be stated that values of stress intensity factor of 0.47_NA was lowest and 0.5_RA was highest. There was no significant difference in average fracture energy of mixes and it lies in range of 180 N/m to 300 N/m.

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Effects of Non-Structural Walls on Mitigating the Risk of Progressive Collapse of RC Structures

Cited by 17 publications

References 19 publications

Shear strengthening of deficient RC deep beams using NSM FRP system: Experimental and numerical investigation

Shear strengthening of deficient RC deep beams using NSM FRP system: Experimental and numerical investigation

Progressive Collapse Resistance of RC Beam–Slab Substructures Made with Rubberized Concrete

Experimental and FEM Analysis for Fracture Performance Evaluation of Concrete Made with Recycled Construction and Demolition Waste Aggregates

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