Do Prefabricated Panel Houses Have Beams?

Prefabricated panel houses do have beams, but they differ from the cast-in-place beams in traditional brick-concrete structures. Prefabricated panel houses belong to prefabricated assembled buildings, with the core being the industrial production of building components (such as floor slabs, walls, beams, etc.), which are then transported to the site for assembly. Although these houses do not rely on the cast-in-place ring beams in traditional brick-concrete structures, they achieve similar functions through reinforcing structures within the prefabricated components, which can be divided into the following two categories:

I. Prefabricated Border Beams: Core Components Replacing Cast-in-Place Ring Beams

Prefabricated border beams are common reinforcing structures in prefabricated panel houses, usually embedded at the top of walls and either cast simultaneously with the floor slabs or fixed with connectors. Their functions are similar to those of cast-in-place ring beams in traditional buildings, but their implementation methods differ:

1. Structural Functions: Border beams connect walls and floor slabs into a whole through their own stiffness, enhancing the lateral stability of the house, especially in resisting horizontal loads such as earthquakes. For example, in multi-story prefabricated panel houses, border beams can form a "frame-shear" structural system with prefabricated floor slabs, dispersing loads and reducing deformation.
2. Construction Methods: Border beams have reserved steel bars or connection holes during factory prefabrication. During on-site installation, they are tied or mechanically connected with the steel bars of the floor slabs, and then the integrity is achieved through post-cast concrete or grouting materials. This industrial production method improves construction efficiency while ensuring component accuracy.

II. Seismic Belts and Other Reinforcing Structures: Supplementing Overall Stability

In addition to border beams, prefabricated panel houses may also enhance their seismic performance through the following structures:

1. Seismic Belts: Prefabricated concrete belts are set longitudinally or transversely in the house, forming a grid-like reinforcing system with border beams to further constrain wall deformation.
2. Constructional Columns: Some prefabricated panel houses set prefabricated constructional columns at wall intersections, enhancing node stiffness through connections with floor slabs and border beams. However, it should be noted that if there are obvious cast-in-place beams above the walls or independent columns at wall intersections, it is more likely to be a cast-in-place structure rather than a prefabricated panel house.

III. How to Determine if a House is a Prefabricated Panel Structure?

The following characteristics can be used as aids for identification:

1. Component Appearance: Prefabricated panels usually have regular mold marks on their surfaces, and their edges may have reserved connection slots or steel bars; cast-in-place structures, on the other hand, have rough surfaces without obvious splicing seams.
2. Beam-Column Forms: If there are prefabricated concrete beams (such as border beams) above the walls, or if there are no independent columns at wall intersections and reliance is placed on border beams for connection, it tends to be a prefabricated panel structure; conversely, if there are cast-in-place beams or columns, it may be a cast-in-place structure.

The "beams" in prefabricated panel houses are mainly prefabricated components, achieving functions similar to those of traditional cast-in-place structures through industrial design while taking into account construction efficiency and structural safety.