Stub-girder system
Structural model for steel-frame buildings
A stub-girder system (or stub girder system) is a model of steel frame structures consisting of beams and decking, originally developed in the early 1970s in part by Joseph Colaco of Ellisor Engineers Inc.
Introduction
Stub girder systems are a relatively common system in steel modern steel buildings, although they are rarely used anymore, they were very prevalent for a long span of time from the early 70s to the 80s. Though they are not really used anymore due to being uneconomical they are still very common and a lot of times when renovating the flooring in a tall steel building they will have to tear down stud girder systems.
Design and Components
There are four main parts of a stub girder system, being the stubs, steel beams, concrete slab and the shear connectors.
Stub
This is the namesake of the stub girder system, and it is a short and thick metal beam that sits between the concrete slab and the metal beams. It is welded to the metal beams and connected to the concrete slab with shear connectors. This mostly helps create the strong connection between the steel beams that support the floor and the concrete slab which helps with shock resistance.
Steel Beams
There are two types of steel beams that are used in the stub girder system, there are the main steel beams that connect to the stubs, and they run parallel to the stubs. This is the beam that connects to the stub to help keep that structurally supported. There are also secondary beams that help to keep the concrete slab and floor from drooping and these beams sit on top of the main beams, which causes them to sit on the same level as the stubs but run perpendicular to the stubs.
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