BEHAVIOR OF REINFORCED CONCRETE BEAMS UNDER DIFFERENT KINDS OF BLAST LOADING

Behavior Of Reinforced Concrete
Beams Under Different Kinds Of Blast
Loading And Their Analysis

Md Asif Akbari
(B.Tech 7th sem), Student Coordinator (T&P)
akbariasif12@gmail.com
+91-7735168092

School of Civil Engineering. KIIT University, Bhubaneswar, Odisha, India

Md Asif Akbari, akbariasif12@gmail.com

INTRODUCTION
• One of the most popular design issue.
• Terror attacks and accidents.
• Subject is popularly applied in modern and
important buildings.
• Emerging branch in the field of structural
engineering


Reasons for concern.
•Today the modern explosive devices are being
used in majority of terrorist attacks because of the
ease of access of information on the construction
of bomb devices, relative ease of manufacturing,
mobility and portability, coupled with significant
property damage and injuries.
•No one can deny the strength of these attacks
after 09/11 World Trade Centre bombing.


Principles of design
•Minimize the quantity and hazard of broken glass and
blast induced debris
•Facilitate rescue and recovery operation with adequate
time of evacuation of occupants.
•To reduce the pressure due to blast loading.
•Maintain safe separation of attackers and targets i.e.
STAND-OFF zones.
•Design to sustain and contain certain amount of bomb
damage. Avoid progressive collapse of the building.
•Allow for limited localized damage of members
•Facilitate rescue and recovery operation with adequate
time of evacuation of occupants.

Air Burst

Surface
burst

Others

Exterior
attack

Blast load definition

•Air Brust
When an explosion
occurs nearby to and
above
a
building
structure such that no
amplification
of the initial shock wave
occurs
between
the
explosive charge and the
structure,
then the blast is called
free air blast.


Characteristics of Air brust
At the arrival time tA, following
the explosion, pressure at that
position suddenly increases to a
peak value of overpressure, Pso,
over the ambient pressure, Po. The
pressure then decays to ambient
level at time td, then decays
further to an under pressure Pso (creating a partial vacumn) before
eventually returning to ambient
conditions at time td + td -. The
quantity Pso is usually referred to
as the peak side-on overpressure,
incident peak overpressure or
merely peak overpressure

Surface brust
A ground burst is the
detonation of an explosive
device such as an artillery
shell, nuclear weapon or
air-dropped bomb that
explodes upon hitting the
ground. These weapons
are set off by that are
activated
when
the
weapon strikes the ground
or something equally hard,
such as a concrete
building.

Characteristics of surface brust
In surface blast unlike
the air blast the wave
combines to create the
total effect of the which
is the combination of
reflected
wave
produced after the
reflection from the
ground and the initial
wave
which
is
hemispherical in shape

DIFFERENT MODELS
Single digree of freedom model

It is the simplest
vibratory system
that can be
described by a
single mass
connected to a
spring (and possibly
a dashpot).

Finite element model
This model is based
on multi degree of
freedom (MDOF) ,
in this model beam
is devided into
finite number of
elements and those
elements
are
further subdivided
into fibre, this helps
to take account into
the variation along
the
depth
of
specimen.
This
modeling
is
generally done by
ABAQUS.

Conclusion
The lack of relevant code is the major concern
behind the ignorance of this phenomena
while designing the structure. In our review
work we have found that the various kind of
loading phenomena the non- linear analysis of
beam column agrees satisfactorily with the
finite element model as analyzed on ABAQUS.


BEHAVIOR OF REINFORCED CONCRETE BEAMS UNDER DIFFERENT KINDS OF BLAST LOADING

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