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This bridge is a good example of Iowa's standard plan rural Parker through truss design. The Parker through design was used for spans that were longer than was practical for its Pratt through and Warren pony truss plans. The Willow Avenue Bridge has four pre-stressed concrete stringer spans which are not original to the bridge.
The truss is configured as follows: End post and top chord: back-to-back channels with v-lacing and cover plate. Bottom chord: outermost panels: two angles with battens, innermost panels: two paired angles with battens. Vertical members: back-to-back channels with v-lacing on each side. V-lacing is positioned parallel to the truss web. Diagonal members: two angles with battens. Portal bracing: A frame design composed of paired and single angles. Sway bracing: upper beam: two paired angles with v-lacing, lower beam: paired angles, both beams connected by angles. Lateral (diagonal) bracing: single angles. Railing: two angles. Deck: Reinforced concrete surface with concrete curb and steel stringers. Floorbeams: rolled American Standard I-Beams.
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