Numerical study and experimental tests on full-scale RC slabs under close-in explosions

Castedo, Ricardo; Santos, Anastasio P.; Alañón, Alejandro; Reifarth, Carlos; Chiquito, María; López, Lina M.; Martínez-Almajano, Santiago; Pérez-Caldentey, A.

doi:10.1016/j.engstruct.2020.111774

Cited by 34 publications

(17 citation statements)

References 38 publications

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“…Since the mesh size affects every Lagrangian model, a convergence analysis should be performed before beginning the calculations. The element sizes of concrete (solids) and bars (beams) were 18 × 18 × 18 mm and 50 mm thickness, respectively, after this study and considering previous works by the authors [3,17,18].…”

Section: Numerical Modelmentioning

confidence: 97%

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Field test and numerical modelling of RC slabs at different scaled distances with two types of external reinforcement

Martínez-Almajano¹,

Castedo²,

López³

et al. 2021

Int. J. CMEM

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This work deals with the response of eight reinforced concrete (RC) slabs, made at full-scale, some of them with the addition of externally bonded fibre reinforced polymer (FRP). The reinforcements were placed in all cases on the face opposite to the explosive detonation. Three scaled distances have been used from 0.83 m/kg 1/3 , in one test with no extra reinforcement; four tests were made with a scaled distance of 0.42 m/kg 1/3 : one without extra reinforcement, two with carbon fibre reinforcement (CFRP) and one with the E-glass fibre reinforcement (GFRP); finally, 0.21 m/kg 1/3 , in three trials, one without extra reinforcement, one with carbon fibre reinforcement and one with the E-GFRP. The first slab, used for calibration of the numerical models, was instrumented with pressure and acceleration sensors. For the validation of the other seven slabs, the damage surfaces on both sides of the slabs are used. In terms of numerical simulation performed with LS-DYNA, several models covering different solutions such as smooth particle hydrodynamics (SPH) or load blast enhanced have been performed for the description of the explosive, as well as the use of CSCM material models for concrete to analyse the best available solutions. The steel was modelled with the piecewise linear plasticity material, while the material laminated composite fabric was used for the FRP. Reinforcement with CFRP resulted in a generally reduced damage area on both surfaces. All models show a good correlation, including nonspherical charges made with SPH models, with the test results when comparing them with respect to acceleration and surface damage. SPH models work well for the high and medium scaled distance, but not so good for the shorter scaled distance.

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Section: Numerical Modelmentioning

confidence: 97%

“…The properties based on the standard RC 1247/2008 -EHE-08 national design code based on EN-1992 [16] are the density (7850 kg/m 3 ), yield strength (500 MPa), Young´s modulus (200 GPa), Poisson´s ratio (0.3) and tangent modulus (20 GPa). See Castedo et al [17] for more details.…”

Section: Numerical Modelmentioning

confidence: 99%

Field test and numerical modelling of RC slabs at different scaled distances with two types of external reinforcement

Martínez-Almajano¹,

Castedo²,

López³

et al. 2021

Int. J. CMEM

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“…Of these, the vast majority are on a reduced scale, but there are some publications that present results on a real scale. Focusing on the slabs we can highlight among others the work of Castedo et al [12] that focuses on the simulation of small loads with smooth particle hydrodynamics (SPH) and validates it with real tests of full-scale slabs; or the work of Ruggiero et al [13] that performs tests with three full-scale slabs and validates the numerical models based on measured pressure and acceleration to then expand the type of models to be performed. The variety of reinforcements to be used for the improvement of structural elements, especially concrete, is very important and increasingly creative, but it is easy to classify between internal reinforcements (added to the matrix) and external reinforcements (outside the concrete).…”

Section: Introductionmentioning

confidence: 99%

“…Numerical models can be of different types depending on how the simulation of the blast load and the structural element is approached. If the load is simulated explicitly (geometry and equation of state), SPH [12] or Arbitrary-Lagrangian-Eulerian (ALE) [17] methods can be used. If the load is simulated using the TNT equivalent, the technique based on numerous blast test (load blast enhanced (LBE)) can be applied [18].…”

Section: Introductionmentioning

confidence: 99%

Full-Scale Reinforced Concrete Slabs With External Reinforced Polymer: Field Test and Numerical Comparison

Castedo

Santos

Reifarth

et al. 2022

WIT Transactions on the Built Environment

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Numerical simulation of reinforced concrete (RC) slabs with the addition of an external reinforced polymer (FRP) have been developed and compared with full scale real tests. The size of the slabs was 4.4 x 1.46 m, with a span of 4 m, and a thickness of 15 cm. The slabs were built using concrete of class C25/30, and B500C reinforcing steel. Seven tests were conducted, one at a scaled distance of 0.83 m/kg 1/3 , three at a scaled distance of 0.42 m/kg 1/3 , and three at 0.21 m/kg 1/3 . For the biggest scaled distance, the slab had no extra reinforcement. In the other two cases one of the slabs had no extra reinforcement, while the other two tests were performed with carbon fibre reinforcement (CFRP) and E-glass fibre reinforcement (GFRP) located on the face opposite to the blast. Numerical simulation was performed with LS-DYNA software. The study elements (concrete, steel and reinforcement) have been simulated in a Lagrangian formulation with solid elements, beam elements and shells, respectively. Three concrete models have been used and compared: CSCM, MAT72-R3 and RHT. As for the explosive, the CONWEP-based Load Blast Enhanced (LBE) card was used. Reinforcement with CFRP resulted in a generally reduced damage area on both surfaces. All models show a good correlation with the test results and a non-destructive damage estimation technique when comparing them in terms of damage area.

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“…e dynamic response and dynamic shear capacity of the RC beams were analyzed. e simulation research of Wang [25], Yan [26], Yankelevsky [27], and Castedo [28] on the dynamic response of the RC components also showed the superiority of the numerical simulation method in studying this problem.…”

Section: Introductionmentioning

confidence: 99%

Experiment and Simulation Study on the Dynamic Response of RC Slab under Impact Loading

Wang

Liu

Xiao

et al. 2021

Shock and Vibration

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Reinforced concrete (RC) slab is an important component in civil construction and protection engineering, and its dynamic response under impact loading is a complex mechanical problem, especially for two or multiple continuous impact loads. In this paper, a series of drop hammer impact tests were carried out to investigate the dynamic response of RC slabs with two successive impacts. The time history of impact force and the failure characteristic of the slab surface were recorded. Moreover, four influence factors, including slab thickness, reinforcement ratio, impact location, and drop hammer height have been discussed. Besides, a 3D numerical model based on the finite element method (FEM) was established to expand the research of constrained force, deflection, and vertical stress of an RC slab. The results show that increasing the slab thickness and reinforcement ratio can improve the impact resistance of an RC slab. The impact point location and drop hammer height have a great influence on the dynamic response of the RC slab. In addition, the RC slab will have more obvious damage under the second impact, but the dynamic response becomes weaker. It may be because of the local damage in the concrete caused by the first impact that would weaken the propagation of vibration.

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Numerical study and experimental tests on full-scale RC slabs under close-in explosions

Cited by 34 publications

References 38 publications

Field test and numerical modelling of RC slabs at different scaled distances with two types of external reinforcement

Field test and numerical modelling of RC slabs at different scaled distances with two types of external reinforcement

Full-Scale Reinforced Concrete Slabs With External Reinforced Polymer: Field Test and Numerical Comparison

Experiment and Simulation Study on the Dynamic Response of RC Slab under Impact Loading

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