Truss

Published on January 2017 | Categories: Documents | Downloads: 41 | Comments: 0 | Views: 514
of 2
Download PDF   Embed   Report

Comments

Content

TRUSS is a framework, typically consisting of
rafters, posts, and struts, supporting a roof, bridge, or other structure.
TYPES OF TRUSS ACCORDING TO WEB MEMBERS
PRATT TRUSS a truss having vertical members between the upper and lower members and
diagonal members sloping toward the center.
A PARKER TRUSS is a Pratt truss (diagonals in tension, verticals in compression) with a
polygonal top chord of more than five slopes. The top chord is composed of inclined straight
members, with the angle of inclination changing at the panel points.
K-TRUSS a truss having in each panel two diagonals running from the ends of one post to the
center of the adjacent post, the arrangement being symmetrical about the center of the truss.
HOWE TRUSS a truss having vertical and diagonal members between the upper and lower
horizontal members.
CAMELBACK TRUSS is a sub-type of Parker truss, which is a sub-type of a Pratt truss. While
some refer to any truss with a curved or polygon top chord as a camelback, the more
strict definition is a Pratt truss with a polygonal top chord consisting of exactly five segments.
WARREN TRUSS A truss consisting of horizontal top and bottom chords, separated by
sloping members, and without vertical pieces.
FINK TRUSS A symmetrical truss, formed by three triangles, commonly used in supporting
large, sloping roofs.

BOWSTRING TRUSS A structural roof truss having a bow-shaped top cord and a straight or
cambered bottom cord.
The BALTIMORE TRUSS is a sub-type of the Pratt truss, but differs by the addition of half-length
struts or ties in the top, bottom, or both parts of the panels. It was first used on the railroads in
the 1870's. "I" Street Bridge (Yolo County, California) (Main design: Through truss) Built 1911.
The WADDELL "A" TRUSS BRIDGE in Parkville, Missouri, also known as Linn Branch Creek
Bridge, was built in 1898.[1] It was designed by engineer John Alexander Low Waddell and is the
subject of a U.S. patent, U.S. Patent 529,220.[2]
The Waddell "A" Truss Bridge spanned the Linn Branch Creek, in Missouri, but was removed for
the construction of Smithville Lake.
The bridge served rail traffic until 1939, and then road traffic for Missouri Hwy 4 from 1953-1980.
It was dismantled in 1981 and moved to its current location at English Landing Park in Parkville,
MO, in 1987.[3]
The Pratt truss includes braced diagonal members in all panels; the PENNSYLVANIA TRUSS
adds to this design half-length struts or ties in the top, bottom, or both parts of the panels. It is
named after the Pennsylvania Railroad, which pioneered this design.
LATTICE TRUSS a truss having its upper and lower chords so connected by diagonal members
as to resemble latticework
A SCISSORS TRUSS is a kind of truss used primarily in buildings, in which the bottom chord
members cross each other, connecting to the angled top chords at a point intermediate on the
top chords' length, creating an appearance similar to an opened pair of scissors.
CAMBERED TRUSS With Fink or Fan trusses having an inclination for the rafter not exceeding 30
degrees it is more economical to employ a horizontal chord or tie since it obviates bending of the
laterals. Raising the bottom chord, also materially increases the strains in the truss members,
hence it increases the cost. A truss whose bottom chord has a rise of two or three feet, as in Fig.
69, presents a better appearance, however, than one with a horizontal chord, and for steep roofs,
it will generally be fully as economical to raise the bottom chord because of the shortening of the
members. Trusses with raised ties are designated as "Cambered."
SAWTOOTH TRUSS having serrations : arranged or having parts arranged like the teeth of a
saw <a sawtooth roof>

Sponsor Documents

Or use your account on DocShare.tips

Hide

Forgot your password?

Or register your new account on DocShare.tips

Hide

Lost your password? Please enter your email address. You will receive a link to create a new password.

Back to log-in

Close