A jack beam (also called a transfer beam) is a beam designed to carry the vertical load of a column and deliver it to adjacent columns or primary frames, allowing a column line to be interrupted. In single-storey steel buildings and PEMBs, jack beams are commonly used where an open bay is needed—such as large doors and hangar openings, loading docks, truck passages, equipment/service zones, or architectural requirements. As your figure suggests, using a jack beam can remove a column from a critical location while still maintaining a rational load path.

Jack beams are important in PEMB projects because they directly improve layout flexibility and operational clearance without expanding the building footprint. Many facilities need uninterrupted space for circulation, material handling, or installation of large machines, and a single interior column can become a major constraint for usability. In procurement terms, the ability to create a wider, obstruction-free opening often increases the functional value of the building and reduces downstream compromises in production flow, storage arrangement, and access planning.

From an engineering perspective, considering jack beams in design is critical because they create highly concentrated actions. A jack beam must safely transfer large column reactions through the beam, its connections, and the supporting columns—often governing bending, shear, local web crippling/bearing, lateral-torsional stability, and serviceability limits (deflection/rotation that can affect cladding alignment and door operation). The supporting columns and foundations may see increased reactions and moments, and connection detailing becomes decisive for real performance. If jack-beam behavior is simplified or treated as a minor detail, the project can face excessive deflections, connection distress, unexpected foundation demands, or field modifications during erection.

MkaPEB enables you to model and analyze jack beams. You can represent the interrupted column line and the transfer mechanism explicitly, so member forces, reactions, and stability checks reflect the real load path—showing how the removed column’s load is redistributed to neighboring frames/columns. This makes it straightforward to present clear model views and result screenshots (geometry, member assignments, loading, reactions, and demand/capacity outputs) that demonstrate the jack beam has been treated as a fully engineered component—supporting safer, more reliable, and more economical designs.