scholarly journals Dynamic Response of RC Panel with and Without Openings Subjected To Blast Loading

2019 ◽  
Vol 8 (10) ◽  
pp. 2535-2549
Keyword(s):  
Reinforced Concrete ◽  
Dynamic Response ◽  
Blast Loading ◽  
Blast Load ◽  
Front Face ◽  
Charge Weight ◽  
Plasticity Model ◽  
Rear Face ◽  
Peak Displacement ◽  
Concrete Damaged Plasticity

The dynamic response of reinforced concrete (RC) panels without and with different configuration of opening under blast load scenario is investigated in the present study. The numerical simulations were carried out using finite element method with ABAQUS application. The concrete behavior under blast loading was modelled using Concrete damaged plasticity model. The material parameters for concrete damaged plasticity model were determined using methodology proposed by [14]. The parametric study was carried out using variation in blast load due to different charge weight. It was observed that the peak displacement increases with increase in blast load. It was also observed that at lower blast load, failure of reinforced concrete panel was initiated by cracking at rear face of panel but as the blast load increases the RC panel was failed by combination of crushing of front face of panel along with cracking of rear face. It was observed that for the given blast load, the RC panel without opening is less affected by crushing failure as compared to RC panel with opening configuration studied. It was also observed that the RC panel with circular opening at center is stiffer than other opening configuration and observed to have stable structural performance against the blast load studied.

scholarly journals Blast Loading and Its Effects on Building

2021 ◽  
Vol 9 (10) ◽  
pp. 1068-1078
Author(s):  
Mohini Chaurasiya
Keyword(s):  
Human Life ◽  
Blast Loading ◽  
Shear Walls ◽  
Shear Wall ◽  
Blast Waves ◽  
Blast Load ◽  
Front Face ◽  
Charge Weight ◽  
Explosion Pressure ◽  
Building Model

Abstract: Terrorist assaults have become more common in recent years. Their main purpose is to destroy important structures such as areas of defense, hospitals, schools, buildings. Due to the explosion, high pressure is generated and the blast time is also very short, but it can damage the structure from outside and inside. Which can cause a lot of damage to human life. There has an influence on the nation's economy. Like the earthquake and wind load, the blast load should also be designed, keeping in mind the important structures that have to be avoided from the explosion. In this research paper, six story R.C.C. Structures exposed to explosion loads are analyzed. We study the effect on the building by changing the weight of the explosive and the distance between the explosion source and the building. The IS 4991-1968 code has been used to calculate the parameters of the explosion pressure waves. The program ETabs 2019 has been used to analyze the effect of blast load. The structure has been modified by providing shear walls to reduce excessive displacement due to blast loading on the building. The results of the analysis are compared after adding the shear wall with the general building model. The result was that after the addition of the shear wall, the effect of blast loading is greatly reduced. Keywords: Blast phenomena, Standoff distance, detonation charge weight (TNT), Front face pressure, Side face pressure, ETABS, RCC, Blast waves, explosive effects, Story Displacement, Storey Drift, Overturning Moment, Shear wall.

scholarly journals Analysis on Dynamic Response of Prestressed Concrete Slab Subjected to Blast Loading

2019 ◽  
Vol 136 ◽  
pp. 03015
Author(s):  
Chongxi Bai
Keyword(s):  
Dynamic Response ◽  
Prestressed Concrete ◽  
Failure Modes ◽  
Concrete Slab ◽  
Blast Loading ◽  
Peak Displacement ◽  
Displacement Response ◽  
Blast Resistant Design ◽  
Index Weight

The dynamic response of prestressed concrete slab under blast loading was analyzed based on LS-DYNA. The laws of influence of degree of prestress, combined reinforcement index, weight of explosives, thickness of slab on the dynamic response of prestressed concrete slab under blast loading were discussed, and the failure modes were given. The analysis results showed that the peak displacement at mid-span increased with increasing of degree of prestress and weight of explosives, and reduced with increasing of combined reinforcement index and thickness of slab. All the parameters, the influence of weight of explosives on displacement response of slab was significantly. Rationalization proposals were provided for blast resistant design of prestressed concrete slab.

Dynamic Analysis on Explosion Resistance Performance of Reinforced Concrete Wall

2014 ◽  
Vol 1078 ◽  
pp. 162-165
Author(s):  
Wen Sheng Li ◽  
Hui Yang ◽  
Bo Zhang
Keyword(s):  
Numerical Simulation ◽  
Reinforced Concrete ◽  
Dynamic Response ◽  
Blast Loading ◽  
Opposite Edge ◽  
Concrete Wall ◽  
Maximum Displacement ◽  
Finite Element Software ◽  
Reinforced Concrete Wall ◽  
Resistance Performance

Based on the finite element software ABAQUS, this paper deals with numerical simulation to dynamic response of reinforced concrete wall under blast loading. Study shows that the explosion resistance performance of the wall with four edges fixed or with two opposite edges fixed are better than that of the wall one edge fixed and another opposite edge simply supported. The greater the explosion impulse, the bigger the maximum displacement of the wall. When reinforcement ratio of the wall increases, the explosion resistance performance of the wall will be improved. At the same time, reasonable reinforcement and external conditions should be made sure. Keywords: Blast Loading, Numerical Simulation, Shear Wall, Dynamic Response

Numerical Simulation on the Form of Reinforcement of Reinforced Concrete Beam with Openings

2013 ◽  
Vol 444-445 ◽  
pp. 884-888
Author(s):  
Xue Han ◽  
Zheng Liu
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Reinforced Concrete ◽  
Failure Mechanism ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Plasticity Model ◽  
Damage Factor ◽  
Finite Element Software ◽  
Concrete Damaged Plasticity

In order to research the stress performance of reinforced concrete beam with different forms of reinforcement around the openings, a numerical simulation on reinforced concrete beam with circle openings is made by using the finite element software. The constitutive relation of concrete offered by the 2010 edition of code for design of concrete structures and the concrete damaged plasticity model is adopted in this article. The damage factor is introduced in the process of modeling, which can reflect the damage of beams with different forms of reinforcement directly and help to reveal the failure mechanism of members. Thus we can propose the optimization of reinforcement method.

scholarly journals Numerical Analysis of Dynamic Response of Corrugated Core Sandwich Panels Subjected to Near-Field Air Blast Loading

2014 ◽  
Vol 2014 ◽  
pp. 1-16 ◽  
Author(s):  
Pan Zhang ◽  
Yuansheng Cheng ◽  
Jun Liu
Keyword(s):  
Dynamic Response ◽  
Failure Modes ◽  
Near Field ◽  
Three Dimensional ◽  
Sandwich Panels ◽  
Blast Loading ◽  
Front Face ◽  
Air Blast ◽  
Solid Plate ◽  
Air Blast Loading

Three-dimensional fully coupled simulation is conducted to analyze the dynamic response of sandwich panels comprising equal thicknesses face sheets sandwiching a corrugated core when subjected to localized impulse created by the detonation of cylindrical explosive. A large number of computational cases have been calculated to comprehensively investigate the performance of sandwich panels under near-field air blast loading. Results show that the deformation/failure modes of panels depend strongly on stand-off distance. The beneficial FSI effect can be enhanced by decreasing the thickness of front face sheet. The core configuration has a negligible influence on the peak reflected pressure, but it has an effect on the deflection of a panel. It is found that the benefits of a sandwich panel over an equivalent weight solid plate to withstand near-field air blast loading are more evident at lower stand-off distance.

scholarly journals Analytical Investigation on non-linear dynamic analysis of reinforced concrete building subjected to blast loading

2021 ◽  
Vol 850 (1) ◽  
pp. 012012
Author(s):  
R. Prashanthi ◽  
S. Elavenil
Keyword(s):  
Reinforced Concrete ◽  
Time History ◽  
Blast Loading ◽  
Analytical Investigation ◽  
Dynamic Responses ◽  
Blast Load ◽  
Reinforced Concrete Building ◽  
Linear Dynamic ◽  
Concrete Building ◽  
Non Linear

Abstract The blast explosion causes catastrophic failure of structure both externally and internally. In this work the analytical investigation is carried out on the blast performance of the reinforced concrete building frame. Reinforced concrete building connection is vital in the Moment Resistant Frames (MRF) and they play a vital role under constant blast load. It is important to design the building for blast loading since they are subjected to large displacements. The non-linear dynamic behavior of the building by time history analysis method is performed by using SAP2000 finite element stimulation software. Blast load is idealized as the triangular pulse for single degree of freedom system and the effect of the blast load at a different standoff distances on the building element is examined. The analytical method could predict the overall flexural, non-linear shear behavior and ductile response of the building at different modes. The results of the stimulations for various failure conditions such as maximum displacement, maximum base shear and spectral acceleration as per IS 1893-2016 for non-linear dynamic responses are investigated in this study.

Cooling Tower Shell under Asynchronous Kinematic Excitation Using Concrete Damaged Plasticity Model

2013 ◽  
Vol 535-536 ◽  
pp. 469-472 ◽  
Author(s):  
Joanna M. Dulinska
Keyword(s):  
Dynamic Response ◽  
Cooling Tower ◽  
Classical Model ◽  
Plasticity Model ◽  
Inelastic Behavior ◽  
Irreversible Damage ◽  
Kinematic Excitation ◽  
Moderate Earthquake ◽  
Fracturing Process ◽  
Concrete Damaged Plasticity

The paper presents the analysis of the dynamic response of a cooling tower to moderate earthquake. To represent inelastic behavior of the concrete material of the tower under dynamic loading, the concrete damaged plasticity constitutive model was assumed. The model consists of the combination of non-associated multi-hardening plasticity and scalar damaged elasticity to describe the irreversible damage that occurs during the fracturing process. Two different models of seismic excitation were used. Initially, a classical model of uniform kinematic excitation was applied. In this model it was assumed that excitation at all supports was identical. Then, a model of non-uniform kinematic excitation, typical for large multiple-support structures, was introduced. In that model the wave passage along the foundation ring was taken into account. It occurred that the assumption of asynchronous excitation led to the increase of the dynamic response of the tower with respect to the assumption of uniform ground motion. The tensile damage (cracking) in some parts of the tower appeared and the stiffness of the concrete was degraded when non-uniformity of excitation was considered. This was due to the quasi-static effects resulting from changes of subsoil geometry during the shock. The analysis indicated that the classical assumption of uniform excitation may lead to non-conservative assessment of the dynamic response of the shell described with concrete damaged plasticity model.

Effect of outrigger-belt truss location on the dynamic response of high-rise building subjected to blast loading

2016 ◽  
Vol 14 (1) ◽  
pp. 54-77 ◽  
Author(s):  
Yasser Sharifi ◽  
Hamed Aviz
Keyword(s):  
Dynamic Response ◽  
Tall Buildings ◽  
Blast Loading ◽  
Blast Load ◽  
Design Stage ◽  
Combined System ◽  
Energy Principle ◽  
Simple Method ◽  
Content Type ◽  
Analysis And Design

Purpose – Nowadays, with the expansion of terrorist operations around the world and also the dangers of accidental explosions, the need to design structures resistant to this phenomenon for the protection and safety of its citizens is inevitable. Tall buildings are one of the most important issues because of which those behavior should be investigated against the blast loading. Design/methodology/approach – In this paper, the authors used a simple method for investigating the dynamic response of tall buildings with the combined system of framed tube, shear core and outrigger-belt truss located at different heights of the building’s that were subjected to blast loading. This proposed model is based on the development of a continuum model and the ruling equations that have been obtained using the energy principle predict the whole structure idealized as a shear and flexural cantilever beam with rotational springs at the belt truss location. Findings – The mathematical procedure shows a good understanding of the structural behavior and is suitable for a quick evaluation during the preliminary design stage, which requires less time. Moreover, it was concluded that the present blast load idealization can be used to reasonably assess the response of tall buildings subjected to blast load. Originality/value – The comparative analysis in this paper could give other engineers a simple analysis method for the preliminary analysis and design of tall building analysis. Numerical example is given to illustrate the ease of application and the accuracy of the suggested model.

NUMERICAL DYNAMIC ANALYSIS OF ORTHOTROPIC PLATES UNDER LOCALIZED BLAST LOADING

2014 ◽  
Vol 1 (1) ◽  
Author(s):  
Sofia W. Alisjahbana ◽  
Wiratman Wangsadinata
Keyword(s):  
Dynamic Response ◽  
Orthotropic Plate ◽  
Temporal Distribution ◽  
Blast Loading ◽  
Delta Function ◽  
Blast Load ◽  
The Novel ◽  
Orthotropic Plates ◽  
Dirac Delta ◽  
Triangular Function

This paper analyzes the dynamic response of fixed supported orthotropic plates under localized blast loading using the method of modal superposition. The analysis procedure is used to quantify the linear transient response of such plates to the localized blast load at different positions. Many studies are currently available, in which the blast load is considered to be spatially uniform across the plate, with a temporal distribution described by a Dirac delta function. The novel aspect considered here is the case for which the blast load is modeled as a linear triangular function, and the orthotropic plate is fixed along its edges. A Mathematica program is used to solve the first and the second auxiliary Levy-type problem to determine the values of the natural frequencies of the system. The results presented here are collected from the results of analyses performed on localized blast-loaded orthotropic plates, for a variety of parameters important with regard to the dynamic response. Conclusions are drawn concerning the influence of the various parameters on the nature of the orthotropic-plate response.

Influence of Concrete Tension Softening Properties on the Steel-Liner Reinforced Concrete Penstock

2013 ◽  
Vol 275-277 ◽  
pp. 1544-1548
Author(s):  
Hai Lin Wu ◽  
Xiao Fan Du ◽  
Shi He Qin ◽  
Yao Li ◽  
Qun Li
Keyword(s):  
Reinforced Concrete ◽  
Damage Assessment ◽  
Hydropower Station ◽  
Plasticity Model ◽  
Damage Distribution ◽  
Distribution Rules ◽  
Tension Softening ◽  
Steel Liner ◽  
Concrete Damaged Plasticity ◽  
Optimization Allocation

In combination with the practice of a large hydropower station, concrete damaged plasticity model is introduced into the steel-liner reinforced concrete penstock for the nonlinear analysis, the damage distribution rules of the surrounding concrete and the stresses of the steels are furtherly studied under the different tension softening characteristic curves, the conclusions can provide the reference for damage assessment of the surrounding concrete and the optimization allocation of the reinforcement for the penstock.

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