In the "Standard Specification Form
for Concrete Established in 2012" [Design: Main Edition] 9 Near-Field
Finite Element Analysis ", the second derivative invariant of deviation
strain and normalized cumulative strain energy are incorporated as
damage indices. WCOMD Studio Ver 1.01.00 has addressed these issues. Deviation strain The second invariant is calculated by the following formula.
Normalized cumulative strain energy is calculated by the following formula.
From these, we calculate the index for which the weighted averaging process was performed by the following formula.
Here εx, εy, γxy are the strain components in the x- and y-directions,
εij and σij are the two-dimensional tensor and the strain and stress at
the Gauss point, f is the amount corresponding to the maximum stress of
the concrete under compressive stress, In one calculation step, s is
the distance from the Gaussian point, and L is the radius of the
averaging region. |