I should say that the lower chord here might buckle at any moment.
It was hard to believe, as he looked back over it, that the whole great span was incurably disabled, was already as good as condemned, because something was out of line in the lower chord of the cantilever arm.
Alexander, still standing at the end of the river span, saw the lower chord of the cantilever arm give a little, like an elbow bending.
You say that you believe the lower chords are showing strain, and that even the workmen have been talking about it, and yet you've gone on adding weight."
Overall, the plots exhibit very small variation rates, except for the lower chord
members and vertical members, as indicated in Figure 9.
where [beta] is the angle between lower horizontal connection member and oblique bracing member, [mathematical expression not reproducible] is the axial displacement of the oblique bracing member, and [mathematical expression not reproducible] is the axial displacement of the lower chord
In the optimisation process, nodes (3, 5, 7, 9, 11, 13, 15, 17, 19) of the upper chord can be shifted vertically, while nodes (2, 4, 6, 8, 10, 12, 14, 16, 18) of the lower chord
For example, a deck-truss bridge has been built in Canada, and its two compression top chords support the floor beams and stringer for the deck, and a single lower chord
is in tension .
This seemed strange at first, but the wisdom of this strategy became apparent when having to construct 13th chords that always necessitate omitting lower chord
Work involves repairing 26 corroded areas, including reinforcing gusset plates and areas of the lower chord
(steel members located beneath the deck), spot-painting areas to slow corrosion and removing concrete areas on the deck s lower surface in poor condition.
To hold the ends of the lower chord
in place, cut two dummy spacers equal to the width of a spacer block plus two laminae; place them between the lower chord
and the outer stops at A and E to hold the chord in place while installing spacers and gluing the top chord.
For a high-end restaurant with an exposed wood truss roof, no ceiling and exposed ducts, our design dropped the diffusers to below the lower chord
of the truss (Figure 3).