Nonlinear numerical modelling for the effects of surface explosions on buried reinforced concrete structures

Nagy, Nabil M.; Mohamed, Mostafa; Boot, John C. G.

doi:10.12989/gae.2010.2.1.001

Cited by 38 publications

(16 citation statements)

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“…An et al used the constitutive of Tong and Tuan for finite‐element (FE) analysis of blast due to explosives embedded in soil. Nagy et al incorporated the Drucker–Prager model in a FE framework and simulated wave propagation through soil due to explosions on the ground surface. Yang et al incorporated the soil plasticity model of Krieg in a FE framework and simulated the propagation of blast wave in soil.…”

Section: Introductionmentioning

confidence: 99%

A high strain‐rate constitutive model for sand and its application in finite‐element analysis of tunnels subjected to blast

Higgins

Chakraborty

Basu

2012

Num Anal Meth Geomechanics

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SUMMARY The paper presents a constitutive model for simulating the high strain‐rate behavior of sands. Based on the concepts of critical‐state soil mechanics, the bounding surface plasticity theory and the overstress theory of viscoplasticity, the constitutive model simulates the high strain‐rate behavior of sands under uniaxial, triaxial and multi‐axial loading conditions. The model parameters are determined for Ottawa and Fontainebleau sands, and the performance of the model under extreme transient loading conditions is demonstrated through simulations of split Hopkinson pressure bar tests up to a strain rate of 2000/s. The constitutive model is implemented in a finite‐element analysis software Abaqus to analyze underground tunnels in sandy soil subjected to internal blast loads. Parametric studies are conducted to examine the effect of relative density and type of sand and of the depth of tunnel on the variation of stresses and deformations in the soil adjacent to the tunnels. Copyright © 2012 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%

A high strain‐rate constitutive model for sand and its application in finite‐element analysis of tunnels subjected to blast

Higgins

Chakraborty

Basu

2012

Num Anal Meth Geomechanics

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“…They modeled the structure using shell elements, wherein, the effect of soil-structure interaction is considered by using Wolf's springdashpot-mass elements. Nagy et al [3] developed nonlinear numerical modelling to study the effects of surface explosions on buried reinforced concrete tunnel. Alzawi et al [4] performed a full scale experimental study on vibration scattering using open and in-filled wave barriers filled with Geo-Foam materials.…”

Section: Introductionmentioning

confidence: 99%

Reduction of Additional Stress in a Barrage Due to Blast Load by Using Open Trench

El-Hakem

2012

The International Conference on Civil and Architecture Engineer

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Some structures are exposed to blast load due to different reasons such as; quarry blasting, explosions used in the construction of new roads, bomb, terrorist attack, or other artificial explosions. Ground vibrations are part of the output of the blasting operations. When their levels are high, they can cause damage to nearby structures. For example; cement companies has been in operation long time ago in some areas in Egypt using quarry blasting. Since then, new structures and new communities were established in these areas and some nearby structures were damaged due to ground vibrations (such as; some buildings in the 15 th of May city). The reduction of the additional stress in the structures is necessary for the safety of the existing structures near the bl ast because even a small amount of blast can produce a serious damage to the structures. Most design codes have specified for the seismic vulnerability and also against vehicular collisions but there are no definite structural design criteria for the struc tures exposed to typical blast loadings. This research is intended to investigate the effect of blast load on a water structure (barrage) when using open trench as low-cost barrier to reduce the internal forces induced in the structure during the blast. T he barrage structure was chosen in this research because this type of water structures is of special importance in Egypt since they control the water management process. The analysis of these structures should be carried out for different loading condition s. They are normally designed for dead load, live load and other occasional loads. To investigate the effect of blast load on the structure (with and without using trench), Finite element analysis model under dynamic load (blast load) has been established for the structure. Non-linear dynamic time history analysis was performed for the structure without using trench. Then, an open trench was used as a wave barrier to reduce the effect of the ground vibrations induced by the blast on the internal forces of the structure. A parametric study was carried out to investigate the effect of different factors affecting the internal forces induced in the structural elements due to blast load such as; depth, width, and location of the trench. These factors are import ant for the safety of structures near the blast.

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“…The air and the TNT charge are not modelled in the research as the soil behavior and tunnel performance are the main parameters that are taken in consideration. The pressure resulted from the blast is only modelled using CONWEP implemented in ABAQUS, [23,26,27]. The soil behavior is simulated using Drucker-Prager Cap model in ABAQUS.…”

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confidence: 99%

“…Both of the two soils are used to represent and compare the behavior of the tunnel under different types of soil. The soil properties are obtained from [26,28], and are represented in Tab. 1.…”

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confidence: 99%

Numerical analysis of underground tunnels subjected to surface blast loads

Nawar

Ata

Nabil

et al. 2020

Frattura Ed Integrità Strutturale

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The increased terrorist attacks on important public structures and utilities have raised the vital necessity for the investigation of performance of structures under blast loads to improve the design and enhance the behavior of structures subjected to such threats. In this study, 3-D ﬁnite element analysis is used to study the effect of surface explosions on the response of RC bored tunnels. The soil behavior is modelled using Drucker-Prager Cap model. Two types of soil are investigated, and the blast load is considered through various weights of TNT explosive charges at heights of 0.50 m and 1.0 m from ground surface. To study the effect of horizontal standoff distance, six different horizontal distances are considered. The results show that the soil type has a significance effect on tunnel response due to surface blasts. Also the weight and the location of charge have a great effect on the safety of the tunnel. Finally, a parametric study is established to define the borders of the restricted area around the tunnel location to be safe.

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Nonlinear numerical modelling for the effects of surface explosions on buried reinforced concrete structures

Cited by 38 publications

References 16 publications

A high strain‐rate constitutive model for sand and its application in finite‐element analysis of tunnels subjected to blast

A high strain‐rate constitutive model for sand and its application in finite‐element analysis of tunnels subjected to blast

Reduction of Additional Stress in a Barrage Due to Blast Load by Using Open Trench

Numerical analysis of underground tunnels subjected to surface blast loads

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