lower chord การใช้

• Bracing at the upper chord and at the lower chord adds strength.
• The diagonals and lower chord have rectangular eyebars wide.
• The lower chords are constructed from eye bars.
• Sometimes both the upper and lower chords support roadbeds, forming a double-decked truss.
• The Discovery Climb allows climbers to ascend the lower chord of the bridge and view its internal structure.
• From the apex of the lower chord, climbers ascend a staircase to a platform at the summit.
• His death was due to a temporary weld failure at a lower chord cross strut at panel 33.
• The track was supported on the lower chord, the floor completely decked and a substantial handrail provided.
• Bartley discovers that one of the lower chords is failing, compromising the structural integrity of the entire bridge.
• The bridge deck hangs from panel points in the lower chord of the main trusses with 39 pairs of hangers.
• The lower chords of the bridge, at by, are among the longest timbers ever used in an Oregon bridge.
• Two sets of heavy timber planks serve as the top and bottom chords, with a secondary lower chord at deck level.
• The depth of a truss, or the height between the upper and lower chords, is what makes it an efficient structural form.
• Its distinctive feature is the diagonals connected to the lower chord by pins, which eliminated the need for vertical members on longer bridges.
• The road deck is made with longitudinal timber planks on large timber cross girders that are supported on the lower chords of the trusses.
• The most common Pratt type is the through truss in which the deck is carried on the lower chord, with overhead lateral supports connecting the top chords.
• If the lower chord ( a horizontal member of a truss ) is sufficiently resistant to bending and shear, the outer vertical elements may be eliminated, but with additional strength added to other members in compensation.
• Repeated lower chords on the harp along with triplet movement in the lower strings give the portion a dark tone, despite the majestic interludes of the brass and the melody ( which would, on its own, be cheerful ).
• On either side vertical board-and-batten siding begins a foot below the lower chord and rises to a gabled metal roof, high, supported by tie-beam rafters with transverse metal rods and diagonal cross-bracing.
• The bridge was finished in September at a cost of $ 6, 000 ( $ } } in contemporary dollars ) . and supported by the web posts rather than suspended from the lower chord as is more commonly done with truss bridges.