Comparative Performance of Precast Column-To-Foundation Connections: A Review

ince the introduction of precast concrete as a structural element in
the early 20th century, precast concrete has evolved significantly into an essential
construction technology in various modern construction projects. This is due to
several advantages of precast concrete, such as time efficiency, relatively lower
costs, good quality control, and environmental friendliness. However, precast concrete

also has disadvantages when applied as part of a seismic-resistant building
framework, primarily in the connection between elements, which does not perform

as well as monolithic joints in terms of structural performance. The precast
column-to-foundation connection is one of the most critical connections, as it
experiences the largest axial-moment combination forces in a structure. Commonly

used types of precast connections include pocket connections, baseplates,
anchor connections, and grouting sleeves. The results of previous research reviews
suggest that pocket connections demonstrate reliable structural performance, provided

the column’s embedment length into the foundation exceeds 1.0 Diameter.
Meanwhile, the structural performance of baseplate and anchor connections is
significantly influenced by the thickness of the baseplate, the number of anchors,
and their configuration. For grouting sleeve connections, the key factors are the
diameter and spacing of the sleeves, as well as the length of the reinforcement bars.
On average, test results for precast column-to-foundation connections indicate that
all the connections above can achieve the strength of monolithic joints. However,
structural performance characteristics such as ductility, energy dissipation, and
stiffness degradation require further modifications to match the performance of
cast-in-place monolithic joints.