The principles of beam-beam connections are similar to those for beam-to-column connection, although some additional preparation may be necessary if beams are to be connected with the top flanges level as is normal.
Beam-beam connections are normally detailed so that the top flanges of the two beams are level. The end of the secondary (supported) beam is therefore often notched to enable attachment to the web of the main (supporting) beam.
The simplest concept for a beam-beam connection is to support one beam directly on the top flange of the other. This is often used with the parallel beam system, providing an efficient means of distributing services horizontally and vertically above and between the main beams respectively. For other framing arrangements for floors this is not a common detail since it leads to deep construction zones. It is, however, commonly used in roof construction where purlins, acting as secondary structural beams, are supported directly on the main beam or rafter.