Catching up, This August I worked on a MassDOT rating for a stone masonry arch in Uxbridge MA. The arch was built in 1900 and rehabilitated in 1936 and 1960 and spans 39.5 feet over the Blackstone River.
The 1936 rehabilitation consisted of adding a 1’-6” concrete slab in the spillway and pointing the arch ring. The 1960 rehabilitation consisted of adding concrete railings and concrete tie beams.
The stone masonry arch is founded on stone masonry abutments with concrete backing.
This was my first time rating a masonry arch but soon after I had to rate an unreinforced concrete masonry arch in Providence RI.
The rating took a few iterations but we were able to derive a complete rating that was well above the statutory loads.
For the inspection we were able to use a 62 foot under bridge inspection unit (UBIU) which was able to reach all parts for the arch.
After figuring out the soil pressure and the dead loads for the spandrel wall and pavement, I input them into STAAD to find the axial and moment coefficients.
Using the coefficients I was able to find the location of for the maximum reactions of the axles and then figure out whether the thrusts were located within the kern.
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