Figure 1-12.Bolting of steel column.
Steel pipe columns are often used in wood-frame
construction, with both wood and steel girders. When
using wood girders, secure the post to the girder with
lag bolts. For steel girders, machine bolts are required.
The base of the steel post is bolted to the top of the pier,
as shown in figure 1-12. The post can also be bolted to
anchor bolts inserted in the slab prior to pouring.
Girders are classified as bearing and nonbearing
according to the amount and type of load supported.
Bearing girders must support a wall framed directly
above, as well as the live load and dead load of the floor.
Nonbearing girders support just the dead and live loads
of the floor system directly above. The dead load is the
weight of the material used for the floor unit itself. The
live load is the weight created by people, furniture,
appliances, and so forth.
Wood girders may be a single piece of timber, or
they may be laminated (that is, built up) of more than
one plank. The built-up girder in figure 1-13, for
example, consists of three 2- by 12-inch planks. The
Figure 1-13.Built-up girder.