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I only looked superficially into the Quebec Bridge's design. The portal design forces the monorails to the outside of the trusses The Quebec Bridge is pin-connected. So hopefully the trusses are able to carry the additional loads. I not you can strengthen eye bar by welding a cut-out steel plate fitting the head of the eye bar and weld rods to the plate. Problem: Can the old steel get welded? Are the pins able to carry the additional loads? Here perhaps more modern analysis methods for eye bar/pin connections might help. Possible but not sure. Strengthening of riveted chord can be done if you find flanges or webs not full of rivets. The post that will have to carry the monorail loads directly are not designed to carry any bending moments. To avoid this the monorail supports will have to be on two common channels right and left of the post that reach completely across the bridge width. A lot depends on how many reserves were calculated into the bridge structure. Steel bridges stand a lot better chance to get strengthened than concrete bridges though it can be done. On long spans like the Quebec Bridge strengthening when possible seems more economic. On shorter spans a new bridge might be better especially if the existing bridge is concrete Strengthening is never cheap. Regards, Volker
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