What structural system consists of large members spanning between vertical supports, with smaller beams framed into them, typically spanning 25 to 40 ft?

The beam-and-girder system is characterized by large structural elements, the girders, which span between vertical supports such as columns. The smaller beams, often referred to as joists, are then framed into these girders, allowing for a distributed load across the entire span. This configuration is particularly effective for covering distances ranging from 25 to 40 feet, making it suitable for many types of buildings including commercial and institutional structures.

In this system, the larger girders carry significant loads from the smaller beams and ultimately transfer those loads down to the vertical supports. Because of the varying sizes of beams and girders, it allows for flexibility in design and the ability to accommodate various architectural styles and functional requirements. The presence of the beams and girders also means that there are more opportunities for mechanical, electrical, and plumbing integration within the ceiling space, which is often a consideration in architectural design.

Other options like cast-in-place construction and precast construction refer to specific methods of forming concrete structures but do not inherently define a structural system involving large spans in the same way as the beam-and-girder system. The flat plate system typically involves a slab that is directly supported by columns, limiting the flexibility in load distribution without the additional support provided by gird