. Details of riveted railroad truss bridges . ar intermediate floor-beam used by the American BridgeCompany is shown in Pig,23 in which no extension plate Is neces-sary. The sketch explains itself. The only difficulty is -17- found in the field riveting. Where the flange on the bottom chord extend outward itip necessary- to make an offset in the end of the floor-beamsimilar to that shown in This floor-beam is riveted to both the bottom chord and inter-mediate post. Where it is possible to make a detail like thisit is a matter of economy for the lower the floor-beam is theless height is
. Details of riveted railroad truss bridges . ar intermediate floor-beam used by the American BridgeCompany is shown in Pig,23 in which no extension plate Is neces-sary. The sketch explains itself. The only difficulty is -17- found in the field riveting. Where the flange on the bottom chord extend outward itip necessary- to make an offset in the end of the floor-beamsimilar to that shown in This floor-beam is riveted to both the bottom chord and inter-mediate post. Where it is possible to make a detail like thisit is a matter of economy for the lower the floor-beam is theless height is required for the head room thru the is a sketch of a detail used where the lower chord is abuilt-up box and extends out farther than the intermediate postor subvertical. Apair of angles are riveted on the upper flangeto insert a triangular gusset plate to act as a brace and givemore rigidity to the truss. part of the floor-beajaa to the side of the bottom chord as thisis a difficult part of the field riveting. The detail shown. Occasionally it is not desirable to rivet the lower 18 - in is used in the Port Perry Bridge over the MonongahelaRiver. A trapizoid weh plate stiffened with angles is rivetedto the ■bottom side of the lov/er chord. This construction has theeffect of causing a negative moment which reduces the positivebending moment due to the load. The same thing is true of thedetail shown in and 28.
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Keywords: ., bookcentury1900, bookdecade1900, bookiddetails, booksubjecttheses
