International Journal of Civil and Structural Engineering Research ISSN 2348-7607 (Online) Vol. 8, Issue 2, pp: (1-10), Month: October 2020 - March 2021, Available at: www.researchpublish.com
Finite Element Analysis of RC Slabs Subjected to Blast Loading Mennatullah Talaat1, Ebtisam Yehia2, Sherif A. Mazek3, Magdy M. M. Genidi4, Alaa G. Sherif 5 1
Teaching Assistant, Construction and building Department, AASTMT, Cairo, Egypt
2
Assistant Prof. of Structural Engineering, Faculty of Engineering at AASTMT, Cairo, Egypt 3
Prof. of Civil Engineering, Military Technical College, Cairo, Egypt.
4
Assoc. Prof. of Structural Engineering, Faculty of Engineering at Mataria, Helwan University, Cairo, Egypt 5
Prof. of R.C Structures, Faculty of Engineering at Mataria, Helwan University, Cairo, Egypt.
Abstract: In this paper, the response of reinforced concrete slabs subjected to blast loading under variable mass of TNT and different reinforcement configuration will be discussed. The study was carried out using the finite element program (ABAQUS) by using 3 different models (concrete slab without reinforcement, concrete slab with single reinforcement and concrete slab with double reinforcement).The plastic behavior of steel reinforced bars and concrete has been incorporated through Johnson-cook model and concrete damage plasticity model respectively. The results obtained from concrete slab models are in terms of Von-Mises stresses, deflection and concrete damage against varying mass of TNT. The results indicate that using double reinforced mesh has great influence on reinforced concrete slabs to withstand blast loads. Keywords: Blast loading, Reinforced Concrete Slabs, ABAQUS, Stresses, Deformation, Damage.
I. INTRODUCTION Nowadays, the damage of structures due to explosion has increased as a result of increase in number and intensity of terrorist activities, accidents and explosions so the effect of blast loads on the structure is a serious matter of concern that should be taken into consideration in the design process It is necessary to first quantify the effects of explosions in order to design structures which are able to withstand the blast loads. [11]They reported that the explosive load on buildings can be simplified into triangle impulse pressure in order to make the simulation easier and then a one-way RC slab against the explosive load can be used as an example to be tested by the powerful FEM software- ABAQUS to simulate numerically the behaviors of the slab. The failure modes for the Reinforced concrete slab under the different loads are presented by the comparison of analysis outcomes for the same impulsive but different duration time and peak pressure of explosive loading. [6]They explained the analysis and design of structures subjected to blast loads. They presented a comprehensive overview of the effects of explosion on structures. [7] They proposed an analytical method by which the punching was estimated by comparing the dynamic shear demand and capacity. The approach takes in account the impulsive behavior of the member leading to a higher punching capacity and gives preferable predictions than using existing formulae for punching. The analytical equations were propped by numerical explicit finite element models giving useful information of crack development, deflections and dynamic reactions. [10] They carried out a numerical simulation on reinforced concrete slab against blast loading to demonstrate the accuracy of the finite element based on using ABAQUS. The parameters studied subjected to surface blast were weight of TNT and boundary conditions. Based on the detailed literature survey , it is observed that most studies focused on simple experiments on slabs subjected to blast loads, however numerical investigations on slabs under blast loading has been found limited. Also the response of reinforced concrete slabs against blast loading under varying mass of TNT hasn’t been studied. In the present study, the simulation has been carried out on 3 different models (concrete slab without reinforcement, concrete slab with single reinforcement and concrete slab with double reinforcement) against blast loading through the finite element program (ABAQUS) under varying mass of TNT. The plastic behavior of steel reinforced bars and concrete has been incorporated through Johnsoncook model and concrete damage plasticity model respectively.
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