Reasons for Fracture Mechanics Approach

Since concrete structures have been designed and successfully built according to codes that totally ignore fracture mechanics theory, it might seem unnecessary to change the current practice. Nevertheless, there are five compelling reasons for doing so.

Reason 1: Energy required for crack formation must be taken into account.

Reason 2: The results of the structural analysis must be objective.

Reason 3: The structural analysis must agree with the absence of yield plateau from the load-deflection diagram.

Reason 4: The stmctural analysis must adequately compute the energy absorption capability and duc­tility.

Reason 5: The. structural analysis must capture the size effect.

Let us examine these reasons in more detail.