Performance of N-Z systems in the mitigation of underground blast induced vibration of structures

A comparative study is carried out on the performance of various elastomeric and frictional base isolation (BI) systems in the vibration mitigation of structures subjected to underground blast induced ground motion (BIGM). The parametric sensitivities of the base isolated structures to variations in the design parameters of the isolators are examined for different intensities of blast input. Results indicate that substantial reductions in both the acceleration and displacement responses of the structure can be achieved by the different base isolators. Generally, the Electricite de France (EDF) base isolator produces higher peak response reductions. However, peak bearing displacements are also largest here. The pure friction (P-F), resilient-friction base isolator (R-FBI) and friction pendulum (FP) systems produce lower values of response reductions but peak bearing displacements as well as residual displacements of isolators are also low. The New Zealand (N-Z) system provides good response reductions with a low to moderate value of peak bearing displacement. The present study indicates how a proper selection of the type of BI system with suitable design parameters can mitigate structural vibration due to different intensities of BIGM and restrict the unwanted characteristics of large isolator displacement and its permanent deformation.

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BLASTCAD — Noranda's three-dimensional computer-aided underground blast design system

International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts ◽

10.1016/0148-9062(93)92487-b ◽

1993 ◽

Vol 30 (5) ◽

pp. 301

Keyword(s):

Three Dimensional ◽

Design System ◽

Blast Design ◽

Underground Blast ◽

Computer Aided

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Analysis and Design of Blast Resistant Structure

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.857.1 ◽

2016 ◽

Vol 857 ◽

pp. 1-6

Author(s):

Elsa Thomas Geethu ◽

Kulbhushan Rai ◽

S. Sithara

Keyword(s):

High Performance ◽

Dynamic Responses ◽

Blast Loads ◽

Analysis And Design ◽

Strain Behavior ◽

Finite Element Software ◽

Structural Problems ◽

Underground Blast ◽

High Performance Fiber ◽

Structural Engineers

In the past few years, the increase in the number of terrorist attacks has shown that the effect of blast loads on buildings is a serious matter that should be taken into design consideration. These man-made disasters have created a challenge to structural engineers world over about the deficiency in the design process. Blast loads are extreme, instaneous, unpredictive impulses acting over milliseconds. Due to this nature of blast loads, it is complicated to analyse the dynamic responses of the structures. Usage of advanced engineering materials for construction can solve these structural problems to an extent. This paper presents the analysis and design of an underground blast resistant shelter made up of high performance fiber reinforced cementitious composites (HPFRCC). This research focuses on an alternative section of cylindrical module of the shelter. The dynamic behavior of module under blast load is studied in finite element software Abaqus CAE 6.12. It is observed that the material stress-strain behavior is greatly influenced by strain rates of loadings. Shelter manually designed using codes in working stress method is verified with the analytical analysis

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