Beams and Columns
Inappropriate or inadequate connections of beams and columns is hazardous and can lead to collapses and worker fatalities. This section describes requirements for connecting beams and columns, in order to minimize the hazard of structural collapse during the early stages of the steel erection process. The requirements of this section are detailed in OSHA Standard 1926.756.
Releasing the Load
During the final placing of solid web structural members, the load must not be released from the hoisting line until:
- The members are secured with at least two bolts per connection, of the same size and strength as shown in the erection drawings.
- These bolts are drawn up wrench-tight.
- The equivalent, as specified by the project structural engineer of record, except as specified in OSHA Standard 1926.756b.
Cantilevered Members
A cantilever is a rigid structural element, such as a beam or a plate, anchored at only one end to a (usually vertical) support from which it is protruding.
When subjected to a structural load, the cantilever carries the load to the support where it is forced against by a moment and shear stress. Click on the image to see an example of the cantilever arms on a suspended truss bridge.
Suspended Truss Span
Cantilever construction allows for overhanging structures without external bracing, in contrast to constructions supported at both ends with loads applied between the supports, such as a simply supported beam found in a post and lintel system.
A competent person must determine if more than two bolts are necessary to ensure the stability of cantilevered members. If additional bolts are needed, they must be installed.
Knowledge Check Choose the best answer for the question.
3-9. A _____ is a rigid structural element, such as a beam or a plate, anchored at only one end to a (usually vertical) support from which it is protruding.
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