Lecture18 - Piers

Lecture18 - Piers - Lecture 18a Sub-structure Design of...

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Unformatted text preview: Lecture 18a Sub-structure: Design of Piers Pier for S-826 connector at NW 103 Street, Miami. Expansion of the deck from one-lane to two-lanes for the I-75 ramp from S-826 at Hialeah. The new piers for the I-494 Wakota Bridge over the Mississippi River at South St Paul, Minnesota. The new bridge consists of twin long-span, cast-in-place, segmental concrete bridges. Each bridge is 98 feet in width with five lanes and two full-width shoulders. The five spans clear 1,879 feet with the maximum span of 466 feet. Substructure used 4 ksi concrete and the superstructure 6 ksi. Post-tensioning consists of 270- ksi seven wire super strand with 23 x 0.6 in-diam. strand tendons in the longitudinal direction and 4 x 0.6 in-diam. strand tendons in the transverse direction. The piers shown above flare up to match the box girder soffit and web incline angle. Note the icebreaker section. The box girders are attached to the stem walls with the reinforcing steel from the stem wall extending into the box girder diaphragm walls. Lake Maracaibo’s segmental box girder bridge.Lake Maracaibo’s segmental box girder bridge....
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Lecture18 - Piers - Lecture 18a Sub-structure Design of...

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