5 The construction of a framework of structural steel involves two principal operations: fabrication and erection. Fabrication involves the processing of raw materials to form the finished members of the structure. Erection includes all rigging, hoisting, or lifting of members to their proper places in the structure and making the finished connections between members. A wide variety of structures are erected using structural steel. Basically, they can be listed as buildings, bridges, and towers; most other structures are modifications of these three.
6 STEEL FRAME There are three basic types of steel construction. These may be designated as wall-bearing construction, skeleton construction, and long- span construction. In wall- bearing construction, exterior and interior masonry walls are used to support structural members, such as steel beams and joists, which carry the floors and roof. It should be noted that while this section of your TRAMAN discusses steel structures, wall-bearing construction is applicable to nonsteel structures as well.
7 STEEL FRAME Wall-bearing construction is one of the oldest and most common methods in use. Although modern developments in reinforced concrete masonry make the use of this method feasible for high-rise structures, wall-bearing construction is normally restricted to relatively low structures, such as residences and light industrial buildings. A tall building with a steel frame,
8 STEEL FRAME In this type of construction, all live and dead loads are carried by the structural- frame skeleton. For this reason, the exterior walls are nonbearin g curtain walls. Roof and floor loads are transmitted to beams and girders,