Comparative Study for Evaluation of Blast Load Parameters using IS 4991-1968 and UFC 3-340-02

2021 ◽  
Vol 6 (3) ◽  
Author(s):  
Nikunj Binnani ◽  
Nikunj Binnani ◽  
Nikunj Binnani ◽  
Nikunj Binnani
Keyword(s):  
Comparative Study ◽  
Blast Wave ◽  
Standoff Distance ◽  
Blast Load ◽  
Protective Structure ◽  
Wave Parameters

The essence of the blast load relies on the factors such as explosive weight, standoff distance of the structure from the explosive, the location of the explosion concerning the structure, shape of the protective structure, and orientation of the structure relative to the explosion. The study provides an approach for calculating blast wave parameters according to IS 4991-1968 and UFC 3-340-02 and demonstrated by examples. It concludes that, in Indian Standard, only positive blast wave is considered but in UFC, both the positive as well as negative blast wave is taken into consideration. Also, there are significant differences in evaluating the parameters as per both standards.

scholarly journals Response of a C-Shaped Building Under Blast Loadings

2019 ◽  
Vol 8 (2S8) ◽  
pp. 1012-1016
Keyword(s):  
Comparative Study ◽  
Research Work ◽  
Blast Load ◽  
Building Structures ◽  
Finite Element Program ◽  
Building Model ◽  
Element Program ◽  
Live Loads ◽  
Triangular Function ◽  
The Comparative Study

Our structures especially building structures, are designed basically for dead loads, live loads for static loading conditions and for wind, earthquake and their combinations for dynamic lateral loadings. As the structures are not designed for unexpected blast load conditions it is not possible for the structures to resist such destructive forces of blast impacts. In this research work a comparative study has been done for the blast forces and earthquake forces. For this study purpose a C-shaped building was modelled for the analysis in finite element program SAP-2000. Initially the building model was analysed for Dead loads, live loads and Earthquake loads. In the second model the building is designed for Blast load. Blast load was defined as a triangular function using codal provisions suggested by IS-4991. The results then are compared and it was checked how far a building designed for EQ can withstand a blast of specific amount of TNT. Also the effect of blast forces due to shape of the building is checked. The comparative study has been mapped and indicated in the paper.

Interaction of Blast Load on AASHTO Girder Bridge

2016 ◽  
Vol 857 ◽  
pp. 131-135
Author(s):  
G. Nikhil ◽  
N.I. Narayanan
Keyword(s):  
Highway Bridges ◽  
Standoff Distance ◽  
Blast Load ◽  
Structural Elements ◽  
Maximum Displacement ◽  
Explicit Finite Element ◽  
Analysis And Design ◽  
Finite Element Software ◽  
Girder Bridge ◽  
Blast Resistant Design

Guidelines of blast resistant design for AASHTO girder bridges have not taken up much importance on researches. As the transportation infrastructure mainly bridges are highly vulnerable for bomb attack, they must be designed to resist it. The analysis and design of bridges subjected to blast load requires a detailed understanding of blast propagation and its dynamic effects on various structural elements. The response of bridge components subjected to blast load is carried out using Abaqus explicit finite element software. The bridge is modeled on the basis of AASHTO-LRFD bridge design specification for highway bridges. Blast load has been introduced on different critical location of the bridge to understand their effects on various structural elements and extent of damage. A thorough parametric study varying standoff distance and TNT mass is done to understand their importance in developing a blast resistant design for AASHTO Girder Bridge. The study concludes that the value of maximum displacement decreases with the increase in standoff distance.

Field Testing of Fence Type Blast Wall for Blast Load Mitigation

2017 ◽  
Vol 17 (09) ◽  
pp. 1750099 ◽  
Author(s):  
Yifei Hao ◽  
Hong Hao ◽  
Yanchao Shi ◽  
Zhongqi Wang ◽  
Ruiqing Zong
Keyword(s):  
Blast Wave ◽  
Cross Sections ◽  
City Planning ◽  
Pressure Sensors ◽  
Field Tests ◽  
Field Testing ◽  
Masonry Wall ◽  
Blast Load ◽  
Blast Loads ◽  
Structural Resistance

To protect structures from external explosions, solid protective barriers have been demonstrated by experimental and numerical studies to be able to effectively mitigate blast loads on structures behind them. However, to protect against blast loads, barriers normally need to be designed to have high structural resistance and ductility. This often requires bulky and heavy protective barriers which are not only highly costly but also often not appropriate for application in downtown areas as they are not friendly to city planning or appearance. Fence type blast wall consisting of structural columns was recently proposed and its effectiveness in mitigating blast loads was investigated through numerical simulations. It was found that the wave–fence interaction and interference of waves significantly reduced the wave energy when the blast wave passed through the fence blast wall. To further investigate the effectiveness and applicability of fence type blast wall as a highly potential technology for structural protection in an urban area, field tests have been conducted and results are reported in this paper. Columns with circular and triangular cross-sections were adopted to build fence blast walls. In addition, a masonry wall was also constructed as solid barrier for comparison. Hemispherical TNT explosive weighing 1.0 kg with different stand-off distances was detonated on the ground to generate the blast load. Blast overpressures in free air, behind the fence blast wall and behind the masonry wall were recorded by pressure sensors. The effectiveness of the fence blast wall in reducing blast wave and protecting structures was demonstrated by the test data.

Study of the Blast Wave Parameters from Small Scale Explosions

1993 ◽  
Vol 18 (1) ◽  
pp. 11-17 ◽  
Author(s):  
M. M. Ismail ◽  
S. G. Murray
Keyword(s):  
Blast Wave ◽  
Small Scale ◽  
Wave Parameters

Blast Wall Shielding Effectiveness

2017 ◽  
Author(s):  
Jihui Geng ◽  
J. Kelly Thomas
Keyword(s):  
Blast Wave ◽  
High Explosive ◽  
Blast Loading ◽  
Blast Waves ◽  
Shielding Effectiveness ◽  
Wave Shape ◽  
Mitigation Option ◽  
Blast Damage ◽  
Wave Parameters ◽  
Vapor Cloud

Blast walls are frequently considered as a potential mitigation option to reduce the applied blast loading on a building or structure in cases where unacceptably high levels of blast damage are predicted. There are three general explosion types of interest with respect to blast loading: High Explosive (HE), Pressure Vessel Burst (PVB), and Vapor Cloud Explosion (VCE). The blast waves resulting from these explosion types can differ significantly in terms of blast wave shape and duration. The effectiveness of a blast wall depends on these blast wave parameters (shape and duration), as well as the blast wall parameters (e.g., height, width and standoff distance from the protected structure). The effectiveness of a blast wall in terms of mitigating the blast loading on a protected structure depends on the combination of the blast wave and blast wall parameters. However, little guidance is available on the effectiveness of blast walls as a mitigation option for non-HE explosion sources. The purpose of this paper is to characterize the effect of blast wave parameters on the effectiveness of a blast wall and to provide guidance on how to determine whether a blast wall is an effective and practical blast damage mitigation option for a given blast loading.

scholarly journals SELECTING THE BEST ARCHITECTURAL FORM OF THE OFFICE BUILDING WITH THE LEVEL OF NON-STOP FUNCTION AGAINST EXPLOSION

2015 ◽  
Vol 7 (2) ◽  
pp. 81-90
Author(s):  
Jalal Nakhaei ◽  
Mahdi Bitrafan ◽  
Shahin Lale Arefi ◽  
Hossein Samee
Keyword(s):  
Finite Element Method ◽  
Sustainable Development ◽  
Finite Element ◽  
Blast Wave ◽  
Blast Loading ◽  
Building Construction ◽  
Office Building ◽  
Blast Load ◽  
Architectural Form

Regarding the importance of structures in sustainable development of countries, the necessity to consider them versus inflicted forces has an especial position. One of the inflicted forces upon these structures is explosion. Given that the resistance of a construction against blast wave depends on the form and shape of the building, numbers of trap doors and openings, power and quality of materials utilized in the building; in consequence, studying and evaluating types of construction forms versus outcomes resulted from explosion find importance. The behavior of three kinds of buildings including the forms of cone, hemisphere and frustum were, therefore, evaluated in the research. Various methods can be applied in order to assess behavior of construction against blast load, however, Finite Element method has been utilized in the article duo to particular capabilities of it in the blast assessments. Then, results of blast loading over the constructions were surveyed and it was concluded that buildings with hemispherical form show the best manner and providing openings called colloquially blast walls are used in the building; construction resistance versus blast load is raised.

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