Finite Element Analysis of the Axial Compression Performance of 3D-printed Ultra-High Performance Concrete and Cast-in-Place Concrete Composite Short Columns

Abstract

Concrete 3D printing construction technology is a new green construction technology with broad application prospects. At this stage, more research on the mechanical properties of concrete 3D-printed structures still needs to be done. This paper investigates the effect of printing layer thickness on the axial compressive mechanical properties of composite short columns through finite element analysis of the stress-strain of 3D printed ultra-high performance concrete and cast-in-place concrete composite short columns under axial load. The results show that the printed shell can effectively restrain the internal core concrete; under axial compression, the reduction in the thickness of the printed layer leads to a decrease in the ductility of the short column while the compressive strength is improved. It provides a reference for practical engineering and subsequent research.