Ch 3 Anatomy of a Bldg Flashcards
A beam supported by columns at the two points near its ends
Simple beam
A beam supported by three or more columns
Continuous beam
A beam supported at only one end, or a beam that extends well passed a support in such a way that the unsupported overhang places the top of the beam intention, and the bottom in compression
Cantilever beam
A beam that spans an opening in a loadbearing wall, such as over a garage door opening (often called a header)
Lintel
(Beans will “open” your butthole)
A beam that carries other beams
Girder
Has the girth to carry beams
A beam attached to a wall column that serves as a shelf for other beams or building features
Ledger
A wood or steel beam used to create a floor or roof assembly that supports sheeting or decking.
Joist
(Floor joists)
A sloped wood joist that supports Roofing coverings between a Ridge beam and wall plate on peaked and hipped roofs
Rafter
The uppermost beam of a pitched roof
Ridge beam
A beam placed horizontally and perpendicularly to trusses or beams to help support roof sheeting, or to hang ceilings
Purlin
A beam that has one or both end supported from above by a cable or rod
Suspended beam (sometimes called a hung beam)
Simplest form of a truss
Planar truss
A truss with a single web member. It consists of two angle supports that intersect a common vertical support that is joined to the bottom cord.
King post truss
The most common type of truss used to form a peaked roof
Triangular truss
A truss in which the top and bottom chords run in the same plane
Parallel chord truss
A steel parallel cord truss assembled with angle iron for the chords and cold drawn round billet for the web. The pieces are tack welded together to form the truss unit.
Bar truss or bar joist
A truss where the top cord is arched, and the bottom cord is straight (horizontal). Often called bowstring trusses.
Can be labeled as rigid arch or bowstring
Arched truss
This truss has a curved self supporting top cord (not tied by the bottom cord) and horizontal bottom cord, along with web members that are all rigidly connected. The load of the truss is delivered, axially downward through the bottom cord, and onto support walls or columns.
Rigid arch truss (or rib arch truss)
A tied truss with an arched upper cord and horizontal tension bottom cord that connects the ends of the arched cord, creating compression in the top cord. Diagonal web members are added to help transfer loads.
Bowstring truss
The top cord of this truss of abuts to the support wall or column. This truss typically requires buttresses or pilaster for masonry walls to help accept the lateral forces that may be developed as the live loads are gained or lost on the roof.
Bowstring truss
Types of arched roofs that are not true trusses (two types)
Tied arch and lamella
Four structural elements
Foundations
Columns
Beams
Connections
FCBC
The hollow shape of a triangle is referred to as
Open Web
Two common arch trusses that can be encountered at structure fires
Rigid arch truss
Bowstring truss
Four notable methods that can create an arched roof
- Bowstring truss
- Rigid arch truss
- Lamella
- Tied arch
This type of truss uses a trapezoidal shape (unequal parallel chords) and diagonal tension members between each panel (or section) of the truss
Pratt truss
(Bridge truss Ch 8)