What is the purpose of using a Saddle or "U" Tie in construction?

The purpose of using a Saddle or "U" Tie in construction is to tie together column ties to vertical corner bars. This connection is crucial for maintaining the structural integrity of reinforced concrete columns. The "U" Tie acts as a tie that wraps around the vertical reinforcement (corner bars), helping to keep the columns stable and properly aligned during the pouring of concrete. This ensures that the concrete can properly develop its strength around the vertical reinforcement, which is essential for the overall performance and stability of the structure.

The other options do not accurately reflect the primary function of a Saddle or "U" Tie. For instance, securing horizontal rebar only does not encapsulate the full role of the "U" Tie, which is more focused on connecting vertical elements. Connecting beams with columns involves different types of connectors or ties that are more specific to beam-column relationships. Securing lightweight mats does not pertain to the load-bearing elements associated with reinforced concrete in the context of column construction.