High-fidelity finite element simulation of non-contact splices in column-drilled shaft connections

Abstract

The connection between columns and the supporting mono-drilled shafts is typically a construction joint. Such joints would often require the use of non-contact splices to facilitate a force transfer mechanism between the reinforcement of the column and drilled shaft due to the geometric irregularity or inadequate space at the interface. However, the application of non-contact splices has often been questioned due to limited investigation on the structural effect of non-contact splices in such connections. By utilizing available research findings and using an existing column-shaft connection consisting of non-contact splices as a prototype, a large-scale experimental investigation was conducted before this Finite Element (FE) simulation study. Subsequently, a three-dimensional FE simulation was performed to simulate the results from the experimental program. Data from the experimental program was used to validate the finite element model developed in this study. Afterward, the model was utilized to perform an FE-based parametric analysis to examine the influence of the factors that affect the performance of non-contact splices. This paper discusses the details of the FE simulation and reports the findings from the parametric analysis. The research findings from the FE simulation and parametric study can provide valuable guidance on designing and constructing a safe and efficient non-contact lap spliced construction joint between a column and a drilled shaft.