Numerical Modelling of Reinforced Concrete Slabs under Blast Loads of Close-in Detonations Using the Lagrangian Approach

11th International Conference on Damage Assessment of Structures

物理学;材料科学

Shuaib, M.^1 ; Daoud, O.^2

Department of Civil Engineering, University of Khartoum, Khartoum, Sudan^1

Building and Road Research Institute, University of Khartoum, Khartoum, Sudan^2

关键词: Charge weight;    Concrete model;    Flexural cracks;    La-grangian approaches;    Maximum deflection;    Non-linear finite-element analysis;    Square RC slabs;    Stand-off distance (SoD);   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/628/1/012065/pdf
DOI  :  10.1088/1742-6596/628/1/012065

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

This paper includes an investigation for the deformations, including deflections and damage modes, which occur in reinforced concrete (RC) slabs when subjected to blast loads of explosions. The slab considered for the investigation is a one-way square RC slab with the dimensions of 1000 x 1000 x 40 mm, fixed supported at two opposite sides. It was subjected to close-in detonations of three different charge weights for a constant standoff distance. For the study, the slab was analysed using the numerical method by means of nonlinear finite element analysis. The slab was modelled as 3-D structural continuum using LS-DYNA software. For concrete modelling, two constitutive models were selected, namely the KCC and Winfrith concrete models. Blast loads were applied to the slab through the Lagrangian approach, and the blast command available in the software, namely LOAD-BLAST-ENHANCED, was selected for the application. The deflections and damage modes results obtained were compared to those from a previously published experiment. From the study, both the KCC and Winfrith concrete models effectively and satisfactorily estimated the actual slab maximum deflection. For damage modes, the KCC model appeared to be capable to capture satisfactorily the general damage mode including flexural cracks. However, the model could not capture the local shear mode at the middle of slab (spallation) because the Lagrangian approach does not simulate the interaction between the ambient air and the solid slab.