Pons Triangulum. Lattice, Bracing, and Trusses, and Lake Street Bridge Center. #2C.

By Divi Logan. Photographer and Author.

These photographs present features near the center of the bridge: the roadway deck’s composition, lattice bracing on the gigantic steel beams, and views of the train deck are visible.

PONS Lake St Center Plates #172 061819 1816

#172

PONS Lake St Center Plates #173 061819 1816

#173

PONS Lake St Center Plates #174 061819 1817

#174

PONS Lake St Center Plates #176 061819 1817

#176

PONS Lake St Center Web #179 061819 1817

#179

PONS Lake St Center Plates #182 061819 1818

#182

PONS Lake St TrDeck+Web #184 061819 1819

#184

PONS Lake St Deck+Web #187 061819 1819

#187

PONS Lake St LB&T #188 061819 1819.JPG

#188

PONS Lake St LB&T #189 061819 1819

#189

PONS Lake St Center Plates #194 061819 1819

#194

PONS Lake St Railway Signal Box #195 061819 1819

Railway signal connection box at bridge center. #195.

Complexities of the Truss Web: lattice bracing, rows of rivets and bolts, lateral bracing, sway bracing, train deck support girders, and member connections of the upper and lower chords are featured.

PONS Lake St LB&T #167 061819 1816

#167

PONS Lake St TrDeck+Web #170 061819 1816

#170

PONS Lake St TrDeck+Web #180 061819 1818

#180

PONS Lake St TrDeck+Web #185 061819 1819

#185

PONS Lake St LB&T #190 061819 1819

#190

PONS Lake St TrDeck+Web #193 061819 1819

#193

PONS Lake St Road Deck ExpJoints #202 061819 1820

Roadway deck finger-style expansion joints near bridge center. #202.

PONS Lake St L&T #252 061819 1825

#252

PONS Lake St #265 LB&T 061819 1825

#265

PONS Lake St Lattices #295 061819 1829

#295

PONS Lake St Lattice Deck #310 061819 1830.JPG

#310

PONS Lake St Web+Train #366 061819 1835

#366

PONS Lake St Web+Train #378 061819 1837

#378

PONS Lake St Web+Train #381 061819 1837

#381

PONS Lake St Web+Train #382 061819 1837

#382

RESOURCES

  1. Logan, Divi. The Lake Street Bridge File Collection. Photographs taken June 18, 2019. Media: Leica Digital. Processed with Microsoft Windows Live Photo Gallery and Paint Text. See related articles and images on LinkedIN and WordPress.
  2. Holth, Nathan. “Lake Street Bridge.” Historic Bridges.org Bridge Browser.  Bridge documented: August 12, 2006 and 2010-May 2012. https://historicbridges. org/bridges/browser/?bridgebrowser=truss/lake/. 26 October 2019.
  3. United States Department of Transportation. Federal Highway Administration. Recording and Coding Guide for the Structure Inventory and Appraisal of the Nation’s Bridges. Washington: Office of Engineering, Bridge Division, Bridge Management Branch, December 1995. Report No. FHWA-PD-96-001.
  4. “Functional Classifications.” https://www.dot.ny.gov/divisions/ engineering/applications/traffic-data-viewer/tdv-definitions/Functional-Classifications.htm. 26 October 2019.
  5. U. S. Federal Highway Administration. FAU-1405 (Lake St) over S BR Chicago Riv. Cook County, Illinois. Bridge Reports.com National Bridge Inventory Data. By James Baughn. 2012-2019. https://bridgereports.com/1139881. 26 October 2019.