Compression Behavior of High-Performance Concrete and High-Performance Fiber-Reinforced Concrete Confined by Spiral Stirrups
Wei Chang, Wenzhong Zheng, Pang Chen
Abstract
To explore the compression behavior of confined high-performance concrete (HPC) and high-performance fiber-reinforced concrete (HPFRC), 24 HPC and HRFRC (steel fiber in 2% volume ratio) circular columns confined with spiral stirrups with compressive strengths up to 116.21 and 138.24 MPa were tested under axial compression. The investigated parameters included concrete strength in the range of 100–120 MPa, stirrups volumetric ratios in the range of 0%–2%, and steel fiber contents in the range of 0%–2%. The results indicated that all specimens fell into two damaged patterns, expansion failure and shear failure, and the stress-strain curves of the specimens had three stages: the linear, nonlinear, and descending branch. Besides, concrete strength and the volumetric ratio of stirrups mainly influenced both the load capacity and the ductility, while steel fibers mainly affected the ductility. Moreover, the Baduage model can be applied to predict the peak stress and the peak strain of confined HPC and HPFRC.