Influence of Load Eccentricity on Structural Response of Slender Hybrid Self-compacting Concrete Columns with Reactive Powder Concrete Shells under Uniaxial Loading

In this paper, a comprehensive investigation of the behavior of slender hybrid reinforced concrete columns consisting of self-compacting normal concrete (SC-NC) and reactive powder concrete (SC-RPC) shells with eccentric compression at different eccentricity ratios is presented. Three eccentricities (۰.۲۵, ۰.۶۵, and ۰.۹) were used to carry out these tests on six specimens, divided into three groups according to the eccentricity ratio. Each group included one reference specimen with a conventional SC-NC shell and one hybrid specimen with an RPC shell. The results showed that RPC contributed to the axial load capacity, and  moment capacities. It is found that axial capacity increased by ۵۷.۸%, ۲۱.۱%, and ۴۶.۹% for small, medium, and large eccentricities, and moment capacity can increase by up to ۵۶%. The RPC-reinforced specimens demonstrated higher absorption energy and lower lateral deflections. The results validate the effectiveness of RPC to improve the structural performance and behavior of hybrid columns subjected to eccentric uniaxial loading and the findings may offer relevant insights for applications in seismic-resistant and high-rise structures.