11.3 Analytical Methods for Predicting the Dynamic Responses …
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0ms
0.8ms
1.6ms
3.2ms
2.4ms
10ms
Fig. 11.8 Von Mises stress contours for C-3 specimen by ALE method, reprinted from Wu et al.
(2020), copyright 2020, with permission from Elsevier
11.3.2 Velocity Method
In Remennikov and Uy (2014), a simplified numerical simulation method based
on velocity loading is proposed to analyze the dynamic response of CFST column
specimens subjected to close-range explosion, which is denoted as velocity method
at present. Following this method, only the column specimens need to be modeled,
the blast loading is equivalent to a velocity loads, and the specific velocities along
the column are derived as follows.
As shown in Fig. 11.9, denoting x as the any sectional position along the column
specimen with the clear span of l, the velocity of the corresponding position v(x) can
be obtained by
l
l/2
x
a
Section
d
d
m(x)
i(x)
(a)
(b)
Fig. 11.9 Determination of elementary specific impulse on column a diagram of the column under
blast impulse b cross section of the column under blast impulse, reprinted from Wu et al. (2020),
copyright 2020, with permission from Elsevier