PURLINS, GIRTS, AND EAVE STRUTS

Purlins are generally lightweight and channel-shaped and are used to span roof trusses. Purlins receive the steel or other type of decking, as shown in figure 3-26, and are installed with the legs of the channel facing outward or down the slope of the roof. The purlins installed at the ridge of a gabled roof are referred to as RIDGE STRUTS. The purlin units are placed back to back at the ridge and tied together with steel plates or threaded rods, as illustrated in figure 3-27.

The sides of a structure are often framed with girts. These members are attached to the columns horizontally (fig. 3-28). The girts are also channels, generally the same size and `shape as roof purlins. Siding material is attached directly to the girts.

Figure 3-22.-Different styles of truss shapes.

Figure 3-23.-Diagonal braces-top chord plane.

Figure 3-24.-Diagonal braces-bottom chord plane.

Figure 3-27.-Ridge struts.

Figure 3-28.-Wall girt.

Another longitudinal member similar to purlins and girts is an cave strut. This member is attached to the column at the point where the top chord of a truss and the column meet at the cave of the structure. (See fig. 3-29.)

There are many more steelworking terms that you will come across as you gain experience. If a term is

used that you do not understand, ask someone to explain it or look it up in the manuals and publications available to you.

Steelworkers are required to lay out and fabricate steel plate and structural steel members. Assignments you can expect to be tasked with include pipe layout and fabrication projects of the type required on a tank farm project. Plate layout procedures are similar to those for sheet metal (see chapter 2). There are some procedures of plate fabrication however, that are fundamentally different, and they are described in this chapter. Steelworkers are also tasked to construct and install piping systems designed to carry large quantities of liquids for long distances.

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