N.B. : The dead weight of the centering has been
estimated equal to about 11,5 tons.

The values referring to the second case (arch + wedge +
spandrels) do not include the dead weight of the centering. Therefore
assuming the above value of 11,5 tons, in the second case Sv gets values
close to 260 tons on the left side and close to 253 tons on the right one.

Moreover in the second case, the values of Sv must be
considered upper limits for the loads acting on each foot of the
centering. In fact these values were obtained assuming that all the loads
produced by the arch + wedge + spandrels were transmitted to the
centering. Really the arch will bear part of these loads in a quote
proportional to its stiffness compared to the one of the centering.

The Sv values for the second case represent the
vertical reactions over the section of joint of the arch to the abutment
(see following figure).