* As a rule, keeping the neutral axis
close to the center of the stack will equalize tension and compression forces so that neither will become too extreme.
The adhesive was located above the neutral axis
(the horizontal at a distance of h/2) on the left side of the line where the load was applied and under the neutral axis
on the right side of the line where the load was applied.
Moreover, the depth of the neutral axis
is taken into consideration, as it considerably affects the depth of the tensile zone and slippage of the embedment reinforcement at the critical section.
Caption: Figure 5: Position of the tendon, neutral axis
, and top and bottom fibres across the span.
(1) Section plane remains plane after loading; this assumption ensures that the strain at any point of the cross section is proportional to its distance from the neutral axis
Thus stress-strain distribution in the section changes and depth of the neutral axis
increases, new flexural stiffness is created.
As a result, the stress of entire cross-section is compressive stress, and affected by the prestressed force the neutral axis
position moved down under the previous stage loading.
Normal stresses that act on the infinitely small side area dF, disposed at the neutral axis
y can be calculated:
For hardness measurement nine indents were made in transverse orientation in the extrados, intrados and neutral axis
Analytical Procedure to calculate Flexural capacity The position of the neutral axis
in the Brick-FRP composite beam is shown in Fig.8 which was determined using equal forces (C = T) concept.