Title:
Theoretical Analysis on Axial Load Ratio Limit of Slender Ultra-High-Performance Concrete Wall-Type Piers
Author(s):
Rui Hu and Zhi Fang
Publication:
Structural Journal
Volume:
122
Issue:
2
Appears on pages(s):
59-70
Keywords:
axial load ratio (ALR); failure mechanism analysis; slender wall-type piers; structural bearing capacity; ultra-high-performance concrete (UHPC)
DOI:
10.14359/51744394
Date:
3/1/2025
Abstract:
Ultra-high performance concrete (UHPC) is considered a material with high strength and good ductility. However, it was found in the experiments that the ductility of slender UHPC walls at high axial- load ratios (ALRs) was not as good as expected. The improvement on the ALR limit of the walls by using UHPC is limited. Thus, this study theoretically investigated the ALR limit of slender UHPC wall-type piers. Equivalent UHPC stress block and equivalent steel strip methods were used to calculate the bearing capacity of UHPC wall-type piers. The calculation results were in good agreement with the summarized experimental and numerical results. Based on the experimental observations and the proposed calculation method, the failure mechanism of the UHPC wall-type piers was theoretically analyzed. Equations for determining the ALR limit of UHPC wall-type piers and suggestions for designing UHPC wall-type piers were proposed. It was suggested that high-strength steel bars should be used with caution in T-section UHPC wall-type piers, especially when the reinforcement ratio is higher than 3%. This study provided references for the compilation of the Chinese Code, “Technical Specification for Ultra-High Performance Concrete Structures.”