Experimental and Numerical Evaluation of UHPFRC Slabs Subjected to Contact and Close-In Explosion

Abstract:

This paper presents achievements in the field of the numerical simulation of the fibrere reinforced concrete (FRC) and ultra-high performance fibre reinforced concrete (UHPFRC). The numerical simulations were performed to verify results of two experimental programmes focused on the blast resistance of FRC and UHPFRC. The response of the FRC and UHPFRC slabs to the contact and near-field blast was studied in these two experiments. As the detail behaviour of specimens could not be observed because of the blast load, the numerical models were prepared. The accuracy of the numerical models was evaluated based on the comparison of numerical and experimental results. Different approaches for blast simulation were tested and compared. The results indicate that the various phenomena (e.g. overpressure propagation, stress cumulation, crack propagation and damage extend) can be successfully simulated. However, the comparison of the soffit velocity, measured with the PDV unit and numerical model showed shortcomings of the numerical model. These numerical model inaccuracies are discussed and their reasons presented.

• Periodical: Solid State Phenomena (Volume 309)
• Pages: 180-185
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.309.180
• Online since: August 2020
• Authors: Ondřej Janota*, Marek Foglar
• Keywords: ALE, Blast Load, Blast Resistance, Numerical Simulation, SPH, UHPFRC Slabs

References

[1] SCHWER, L. E., MALVAR L.J., Simplified Concrete Modeling with *MAT_CONCRETE_ DAMAGE_REL3 [online]. (2005).

[2] MALVAR L.J., CRAWFOR, J.E, WESEVICJ, J.W. and SIMONS, D. A new concrete material model for DYNA36, Karagozian and Case. Report No. TR94-14.3, (1994).

[3] MARKOVICH N., KOCHAIV E., BEHN-DOR G. Calibration of a Concrete Damage Material Model in LS-DYNA for a Wide Range of Concrete Strengths, Protective Technologies Research and Development Center, Finite Elements in Analysis and Design, Volume 47, Issue 11, 1280-1290 (2011).

DOI: 10.1016/j.finel.2011.05.008

[4] HILDING D., Methods for Modelling Air Blast on Structure in LS-DYNA, Nordic LS-DYNA Users' Conference (2016).

[5] XU J., WANG J., Interaction Methods for the SPH Parts (Multiphase Flows, Solid Bodies) in LS-DYNA, 13th International LS-DYNA Users Conference.

[6] TENG H., WANG J., Particle Blast Method (PBM) for Simulation of Blast Loading, 13th International LS-DYNA Users Conference.