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ARCHITECTURE & GENIE
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2.  Ohio River Bridge. Typical cantilever and suspended span bridge, showing the
truss geometry in the end span and cantilevered portion of the main span.
(Madison, Indiana)
 STRUCTURE TREILLIS

3.  Modern parallel-chord truss consisting of three square panels cantilevered from
the left end. Made of flexible spines, all joints rigid. Single diagonal in each
panel.
 STRUCTURE TREILLIS

4.  Effect of vertical upward end load. Compression members can be seen by their
tendency to buckle. Long diagonals in tension, short verticals in compression
due to shear direction. Truss buckles as a system due to rigid joints and joint
rotation.
 STRUCTURE TREILLIS

5.  Effect of vertical downward end load. Lower buckling load as due to the
direction of shear the long diagonals are now in compression and shorter
verticals in tension. Lower chord also in compression. Again truss buckles as a
complete system.
 STRUCTURE TREILLIS

6.  Simple Pratt truss in exhibition hall. Direction of diagonals such that
all are in tension due to a UD load on the truss. (Las Vegas, Nevada)
 STRUCTURE TREILLIS

7.  Detail of pin-jointed truss connection, approach span to San Francisco-Oakland
Bay Bridge. Pin joints are used in older bridges or situations where rotation has
to be allowed for due to settlement, or for construction purposes. (San Francisco
Bay Area)
 STRUCTURE TREILLIS

8.  Crumlin Viaduct. Designed by Brunel (1806-59), this early railway viaduct is
interesting in that it is constructed entirely from pin-connected iron members.
(Ebbw Vale, Wales)
 STRUCTURE TREILLIS

9.  Lift bridge, Sacramento River Delta. This simple bridge is used to introduce
many aspects of truss bridge design. Details are shown in GoddenD9-D17. A
Warren truss with verticals is used throughout. Lift span is simply supported.
The double spans on each side are determinate due to internal pins. (Near Rio
Vista, California)
 STRUCTURE TREILLIS

10.  Lift bridge, Sacramento River Delta. Lift span shown partially raised. Note the
counterweights that balance the lift span have dropped to the mid-height of the
towers. (Near Rio Vista, California)
 STRUCTURE TREILLIS

11.  Close-up of the towers. In a direction parallel with the bridge axis the bracing
consists of a Warren truss, and in the other direction it is a K-truss. (Near Rio
Vista, California)
 STRUCTURE TREILLIS

12.  Ohio River Bridge. Typical cantilever and suspended span bridge, showing the
truss geometry in the end span and cantilevered portion of the main span.
(Madison, Indiana)
 STRUCTURE TREILLIS

13.  Ohio River Bridge. Typical cantilever and suspended span bridge, showing the
truss geometry in the end span and cantilevered portion of the main span.
(Madison, Indiana)
 STRUCTURE TREILLIS

14.  Ohio River Bridge. Typical cantilever and suspended span bridge, showing the
truss geometry in the end span and cantilevered portion of the main span.
(Madison, Indiana)
 STRUCTURE TREILLIS

15.  Ohio River Bridge. Typical cantilever and suspended span bridge, showing the
truss geometry in the end span and cantilevered portion of the main span.
(Madison, Indiana)
 STRUCTURE TREILLIS

16.  Ohio River Bridge. Typical cantilever and suspended span bridge, showing the
truss geometry in the end span and cantilevered portion of the main span.
(Madison, Indiana)
 STRUCTURE TREILLIS