Roberto Clemente Bridge @ Pittsburgh, PA
The Roberto Clemente Bridge, also known as the Sixth Street Bridge, spans the Allegheny River. The current bridge was completed on September 29, 1928.
Named for the Pittsburgh Pirates baseball player Roberto Clemente, it is one of three parallel bridges called The Three Sisters, the others being the Rachel Carson Bridge and the Andy Warhol Bridge.
The three bridges are nearly identical self-anchored, eye-bar suspension type, so called because the horizontal pull of the top cords is resisted by the steel girders along each side of the roadway. The suspension system consists of 14" eye-bars extending from end to end having two pins on the top of each tower and carrying the roadway by 4" eye-bar suspenders at the panel points. The stiffening system consists of triple web plate girders placed parallel to the road grade. The girders are thus subjected to stresses due to bending combined with direct compression. All three bridges were fabricated and erected by American Bridge (AB). In an innovative approach, AB turned the eye-bar catenary/deck girder system temporarily into a truss by adding a diagonal to enable erection by balance cantilever and avoiding falsework in the river. (Wikipedia)
Roberto Clemente Bridge @ Pittsburgh, PA
The Roberto Clemente Bridge, also known as the Sixth Street Bridge, spans the Allegheny River. The current bridge was completed on September 29, 1928.
Named for the Pittsburgh Pirates baseball player Roberto Clemente, it is one of three parallel bridges called The Three Sisters, the others being the Rachel Carson Bridge and the Andy Warhol Bridge.
The three bridges are nearly identical self-anchored, eye-bar suspension type, so called because the horizontal pull of the top cords is resisted by the steel girders along each side of the roadway. The suspension system consists of 14" eye-bars extending from end to end having two pins on the top of each tower and carrying the roadway by 4" eye-bar suspenders at the panel points. The stiffening system consists of triple web plate girders placed parallel to the road grade. The girders are thus subjected to stresses due to bending combined with direct compression. All three bridges were fabricated and erected by American Bridge (AB). In an innovative approach, AB turned the eye-bar catenary/deck girder system temporarily into a truss by adding a diagonal to enable erection by balance cantilever and avoiding falsework in the river. (Wikipedia)