Performance analysis of column-to-column connections using steel shoe splices in precast concrete structures

ABSTRACT

Precast concrete structures in Brazil are usually unbraced with continuous columns. Which are responsible for the lateral stability and vertical load transfer. With the growing use of precast concrete structures in multi-storey buildings arises a need for moment-resisting connections in the concrete columns, explained by the logistical difficulties of transport and assembly. Moment-resisting connections are a solution to counteract the logistical shortcomings. The main focus of this paper consists in analyzing the connection’s mechanical behavior under service loads. In order to achieve this goal two full scale models were built and tested (four point bending): one cast-in-situ column and one connected using steel shoes. The measured displacements were used to determine the equivalent stiffness, curvature, and deflection. From this research it’s possible to assert that the model with bolted connections (LB-PAR) displays similar behavior to the cast-in-situ model up until 80% of the load that causes the rebar to yield. The mechanical behavior of the connection is considered satisfactory for regular use, since the restrictions to the use are observed in the specific cases in which the structural behaviour is significantly influenced by second order effects.

Keywords
Precast concrete structures; equivalent connection; connections stiffness; steel shoes; momentresisting connections