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BRIDGE

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BRIDGE Powered By Docstoc
					Jake Neal and Jay K
   OFFICIAL NAME:
    Smithfield Street Bridge



    LOCATION:
    Pittsburgh
LENGTH OF MAIN SPAN:
2 main spans, 360 ft each (344 ft clear)

TOTAL LENGTH (including longest elevated ramp):
1,184 ft
HEIGHT OF DECK:
42.5 ft
Emsworth Dam normal pool level 710 ft


Carries 4 lanes of roadway 2 pedestrian walkways.
TRUSS LENGTH: 34 Inches, 246 scale ft. (32 % reduction)

TRUSS HEIGHT: 6.5 Inches, 47 scale ft. (7% reduction)
WIDTHS:
   BETWEEN:
    The bridge connects Smithfield Street in Downtown
    Pittsburgh with Station Square.

   CROSSES:
    Monongahela River
Cost: 16.3 million

PARTS COUNT: Estimated 8,000 - 9,000

  WOOD TIES: 1,100 (rail side)

  MAN HOURS: Estimated 2,000 minimum

  RAW MATERIALS USED: C-V bridge girders, Plastruct Structural Shapes
  and Cement, Evergreen strips and sheet stock, 36 ft. code 100 rail.
YEAR ERECTED     / ENGINEER:
1881-83; Gustav Lindenthal, engineer
upstream side added 1889; widened to match downstream span 1911
The bridge has been designated a National Historic Civic
Engineering Landmark, a National Historic Landmark,
and has a Historic Landmark Plaque from the Pittsburgh
History and Landmarks Foundation.
The bridge also served the Pittsburgh   Railways streetcar
system with a rail line
Thursday, January 24th, 2008


                          There was an icy spot on the Smithfield
                          Street Bridge and that people were falling
                          who crossed it.

                          From an office overlooks the bridge and a
                          few of us took a gander. Sure enough: we
                          saw a beautifully executed pratfall. As if we
                          were watching a circus performance, we
                          ohhed and ahhed as about one out of every
                          ten people who crossed the spot fell.
A suspension bridge is a type of bridge in which the deck is hung below suspension
cables on vertical suspenders.




       In a lenticular truss, the top and bottom chords are curved in such a way
           that the top chord functions as an arch, and the bottom chord
           functions as a suspension cable.3 Vertical and diagonal web members
           are necessary to divide the top and bottom chords into manageable
           lengths and to transfer deck loads to the top chord and the bottom
           chord. They also redistribute nonuniform loading, which cannot be
           resisted by arch and cable action alone. The deck can be placed above
           the top chord, supported by posts; below the bottom chord,
           supported by hangers; or in between the two chords.
A holiday card featuring
Pittsburgh's historic
Smithfield Street Bridge. The
inside greeting is "Wishing
you peace and joy this holiday
season

 In 1845 half of
  Pittsburgh burns
 to the ground
 including the
 Smithfield Street
  Bridge.
                          The bridge also has the
The present bridge is     distinction of being the
the third bridge at the   most heavily walked
site and remains the      pedestrian bridge
oldest steel bridge in
the United States.

				
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posted:12/19/2011
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