Generally
the failure modes on structure associates with the explosive loading can be
flexure, direct shear or punching shear, bleaching and spalling which is
depended on the explosive size and standoff distance between the blast source
and the target as shown in Figure 2.
The
extend of the damaged on a structure can be classified as light, moderate
and also severe.
In Fig-1 the damages by explosion are marked as A,B,C respective to Severe, Moderate, Light.
 |
| Fig -1 Concrete Damaged by Blast |
Light damaged (Fig: 1 C) is referring to the appearance of hair line
crack with crack width of less than 1 mm on the exposed surface of the
concrete. Moderate damaged (Fig: 1 B)refers to the situation when the bottom surface of
the concrete is having cracks width of up to 1.5 mm and also having a minor
spalling. Severe damage (Fig: 1 A)refers to the large cracks up to 4 mm wide together
with large deflection and also heavy concrete spalling.
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