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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Dynamic Response of Structure under Blast Load
Author(s)
Daniel Makovicka1 and Jr. Daniel Makovicka2
Full-Text PDF
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DOI:10.17265/1934-7359/2016.04.004
Affiliation(s)
1. Department of Mechanics, Klokner Institute, Czech Technical University, Prague CZ 166 08, Czech Republic
2. Static and Dynamic Consulting Firm, Kutna Hora CZ 284 01, Czech Republic
ABSTRACT
The paper follows from the
theory of explosion and interaction of an impact wave formed by the explosion
and a structure. Firstly, the paper determines the parameters of the blast wave
excited by a small charge explosion. The empirical formulas on the basis of our
own experimental results are shown and used for the structure analysis.
Evaluations of structures loaded by an explosion based on dynamic response in
rotations round the central line of plate or beam systems during the dynamic
load of this type is discussed in the paper and comparison of own limit values
and published ones is presented. Blast loads typically produce very high strain
rates 
in the range of 10-2 to 10-4 s-1. The effect of strain rate for concrete material is discussed.
The formulas for increased compressive strength of concrete and steel
reinforcement are presented. The ductility of structural members is influenced
by the corresponding values under high strain rate of reinforcement. Damage to
the structure is assessed accordingly firstly by the angle of rotation of the
middle axis/surface, and secondly by the limit internal forces of the selected
structure. The extreme nature of blast resistance makes it necessary to accept
that structural members have some degree of inelastic response in most cases.
This enables the application of structure dissipation using the ductility
factor and increased of concrete strength. The limits are correlated with
qualitative damage expectations. The methodology of dynamic response assessment
and its application to the simple bridge structure is discussed.
in the range of 10-2 to 10-4 s-1. The effect of strain rate for concrete material is discussed.
The formulas for increased compressive strength of concrete and steel
reinforcement are presented. The ductility of structural members is influenced
by the corresponding values under high strain rate of reinforcement. Damage to
the structure is assessed accordingly firstly by the angle of rotation of the
middle axis/surface, and secondly by the limit internal forces of the selected
structure. The extreme nature of blast resistance makes it necessary to accept
that structural members have some degree of inelastic response in most cases.
This enables the application of structure dissipation using the ductility
factor and increased of concrete strength. The limits are correlated with
qualitative damage expectations. The methodology of dynamic response assessment
and its application to the simple bridge structure is discussed.
KEYWORDS
Explosion, blast wave, dynamic load, response, assumption, bridge structure.
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