Ohio Street over North Branch of Chicago River – Feasibility Study

Project Overview

Description

Feasibility study and condition inspection for the Ohio Street bridge over the North Branch of the Chicago River — informing rehabilitation versus replacement decision-making.

HBM's Scope

Scope of Work

• ›Condition inspection
• ›Feasibility analysis
• ›Rehabilitation alternatives
• ›Existing structure: two double-leaf trunnion bascule bridges carrying three lanes westbound and three lanes eastbound over the North Branch of the Chicago River
• ›Overall length 354' (centerline-to-centerline fixed piers; spans 26'-9" / 31'-9" / 237'-6" / 31'-9" / 26'-3"); out-to-out deck width 43'-10" each bridge
• ›Movable span: 3"-high concrete-filled metal grating on W18 steel stringers, built-up transverse floor beams and truss members; approach span: 7 1/2"-thick RC deck on W30 steel stringers and built-up floorbeams/cross girders; RC piers and abutments with counterweight pits
• ›In-depth structural inspection with finite element modeling covering gusset plates, truss members, stringers, floor beams, and lateral bracing; three repair alternatives presented, prioritized by inventory ratings
• ›Feasibility Study submitted May 2017, setting the stage for Phase II engineering services