Shear Friction Behavior of Hollow-Precast Concrete Column for Eco-Friendly Construction of Building

Abstract

Recently, a few studies has been conducted regarding centrifugal formed PC columns to enhance constructability and integrity due to a hollow precast concrete (HPC) column with a hollow part at the center of the column. However, in the case of this Cast-In-Place (CIP) material, and in particular, the contact surface is present between the two materials, forming a composite structure. Accordingly, as HPC column and CIP concrete are subjected to unbalanced compressive forces, the compressive performance is likely to be lowered due to the interfacial shear failure at the interface of the two materials. In this regard, a compression test was performed to figure out the shear friction between CIP and HPC in this paper. As a result, the splitting failure is induced as a lateral stress occurs under unbalanced compression and HPC column is not expected to utilize its bearing strength sufficiently. Accordingly, the splitting failure should be prevented by increasing the thickness (h) of HPC column part through adjustment of the hollow diameter of the HPC column to less than a certain size, or confining the HPC column part with the use of connection rebars.