Finite-Element Analysis of Reinforced Concrete Plates Subjected to Repeated Impact Loads

Othman, H.; Marzouk, H.

doi:10.1061/(asce)st.1943-541x.0001852

Cited by 53 publications

(28 citation statements)

References 24 publications

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“…compared to K c of 1 for Drucker-Prager of NSC. A UHP-FRC FEM model was calibrated under impact load such that only the values for material parameters with a significant effect were considered; based on a sensitivity analysis conducted in a previous study by Othman and Marzouk (2017), these parameters included fracture energy (G F ), uniaxial tensile strength (f t ) and dilation angle (ψ) as shown in Figure 5. Other CDP parameters with marginal effect, including є, σ σ bo co / and K c , are set to the default values of 0.1, 1.16 and 0.67, respectively.…”

Section: Recommended Damage Plasticity Model For Uhp-frcmentioning

confidence: 99%

“…It can be observed that the mid-point displacement and pressure for Table 1. Sensitivity analysis results (Othman and Marzouk, 2017).…”

Section: Blast Plate Testing Validation For the Femmentioning

confidence: 99%

“…The exact experimental test setup and loading and boundary conditions are modelled in the FEM for UHP-FRC. The CDP parameters used in the model validation were the same parameters recommended by Othman and Marzouk (2017). The results of the validation for UHP-FRC are shown in Figures 7 through 9.…”

Section: Materials Parametermentioning

confidence: 99%

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Design guidelines and optimization of ultra-high-performance fibre-reinforced concrete blast protection wall panels

Sherif

Othman

Marzouk

et al. 2020

International Journal of Protective Structures

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Ultra-high-performance fibre-reinforced concrete is the latest generation of structural concrete, having outstanding fresh and hardened properties; this includes the ease of placement and consolidation with ultra-high mechanical properties, as well as toughness, volume stability, durability, higher flexural and tensile strength, and ductility. As more research is being focused on it, the material behaviour and characteristics are getting more understood, and the research demand for the special applications of the ultra-high-performance fibre-reinforced concrete is growing higher. One special application that ultra-high-performance fibre-reinforced concrete is thought to have an outstanding performance at is in the field of protective structures, specifically against blast loads. This article presents part of a study that is concerned with the behaviour and response of ultra-high-performance fibre-reinforced concrete wall panels under blast load. Size and shape optimization techniques were combined in this study to optimize the design of a 200-MPa ultra-high-performance fibre-reinforced concrete under blast loads using finite element modelling. This design optimization aims to maximize stiffness and minimize the cost while satisfying both design stresses and construction requirements. The design variable to be optimized for are the thickness ranging from 100 to 300 mm at 25 mm increments, in addition to the reinforcement ratio of 0%, 0.2%, 1% and 3%, and aspect ratio of 1, 1.5 and 2; the boundary condition is four edges fixed and restrained. The numerical simulation has been performed using an explicate finite element software package. The complete behaviour of an ultra-high-performance fibre-reinforced concrete is defined using the concrete damaged plasticity model. The concrete constitutive model has been developed considering the contribution of tensile hardening response, fracture energy and crack-band width approaches to accurately represent the tensile behaviour and guarantee mesh independence of results. The blast load is applied using the Conventional Weapons method of the US Army Corps of Engineers that is readily available in the finite element software. The validity of the numerical model used is verified by comparing numerical results to experimental data.

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Section: Recommended Damage Plasticity Model For Uhp-frcmentioning

confidence: 99%

“…It can be observed that the mid-point displacement and pressure for Table 1. Sensitivity analysis results (Othman and Marzouk, 2017).…”

Section: Blast Plate Testing Validation For the Femmentioning

confidence: 99%

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Design guidelines and optimization of ultra-high-performance fibre-reinforced concrete blast protection wall panels

Sherif

Othman

Marzouk

et al. 2020

International Journal of Protective Structures

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“…The literature review reveals that there are comprehensive studies where the effects of the steel reinforcement ratios and the applied input impact energy level on impact behavior of RC slabs have been investigated. Furthermore, the studies focused on the impact behavior of RC slabs strengthened using fiber reinforced polymer (FRP) material with various layouts, the pretensioned RC slabs, and the slabs manufactured from fiber‐RC have been presented in the literature 1–18 . However, the number of experimental studies examining the effects of different support conditions on the behavior of RC slabs subjected to impact loading is quite limited 19 …”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of impact behavior of reinforced concrete slab with different support conditions

Yılmaz

Kıraç

Erdem

et al. 2020

Structural Concrete

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Reinforced concrete (RC) slabs may be subjected to impulsive dynamic loads such as blast and impact during their service period. Many studies related to the impact behavior of RC slabs have been presented. However, comprehensive studies where the effect of the support conditions on the impact behavior of RC slabs has been investigated are still limited. Thus, this study has focused on the effects of the support types and the support layouts on the dynamic responses and the failure modes of RC slabs subjected to impact loads. In the first part of the study, 9 two‐way RC slabs with various support layouts composed of fixed and hinged supports were tested under impact load via the drop‐weight test setup. Two different input impact energies were transmitted to RC slabs during impact loading. The time histories of the accelerations and displacements occurred in RC slabs, and the impact loads acting on RC slabs were recorded. The crack patterns due to the impact load were observed. The dynamic responses obtained by experiments have been interpreted in detail. In the second part, a detailed finite element procedure in which explicit dynamic analysis is performed has been introduced for verification of the experimental results. Good agreement between the experimental and the numerical results has been demonstrated. It has been concluded that proposed finite element procedures can be used for evaluation of the dynamic responses and failure modes of RC slabs under low‐velocity impact load.

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“…No available uniaxial tensile or confined compressive tests were conducted for the concrete mixes analysed in this study. According toOthman and Marzouk (2017), the parameters needed for the CDP model are determined and presented in Table3.5. Through measurements resulting from biaxial compressive and uniaxial compressive tests, the parameter α is determined by computing the ratio of biaxial compressive strength to uniaxial compressive strength(ABAQUS, 2014).…”

mentioning

confidence: 99%

Finite Element Modelling of the Fire Resistance of Double Skin Composite Walls Subjected to Monotonic Compressive Loading

Bournas¹

2021

Preprint

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The fire resistance of double skin composite wall (DSCW) system composed of two profiled steel sheets and concrete infill is investigated through use of finite element (FE) methods. The fire resistance of DSCW when exposed to elevated temperature and a constant axial compressive load with different infill materials such as self-consolidating concrete (SCC), engineered cementitious concrete (ECC) and ultra-high performance concrete (UHPC) is investigated. The influence of parameters such as load level, thickness of steel sheets, depth of concrete core and fastener arrangement on the fire resistance of the DSCW are established. The performance of SCC-based DSCW has the best fire resistance followed by ECC and UHPC-based composite walls. The increase in load level decreases the fire resistance while the increase in depth of concrete infill increases the fire resistance of the composite wall. The fastener arrangement and steel thickness have no significant influence on the resulting fire resistance.

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Finite-Element Analysis of Reinforced Concrete Plates Subjected to Repeated Impact Loads

Cited by 53 publications

References 24 publications

Design guidelines and optimization of ultra-high-performance fibre-reinforced concrete blast protection wall panels

Design guidelines and optimization of ultra-high-performance fibre-reinforced concrete blast protection wall panels

Experimental and numerical investigation of impact behavior of reinforced concrete slab with different support conditions

Finite Element Modelling of the Fire Resistance of Double Skin Composite Walls Subjected to Monotonic Compressive Loading

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