Abstract
Abstract Concrete Technology has been developing for more than a century. One of the most exceptional achievements in concrete technology is the evolving of Ultra-High Performance Concrete (UHPC) which has been a research focus in a wide applications diversity. In this paper, an experimental work has been carried out for investigating the transverse and longitudinal reinforcements’ variation influence on the axial capacity of UHPC columns. Eight columns (five UHPC columns and three Normal Strength Concrete (NSC) columns) have been poured and tested under a concentric axial compression load till a failure is reached. Then, the results are reported herein. The experimental results show that UHPC columns failed in a controlled manner and no concrete chips or a concrete cover spalling are observed. Also, the longitudinal reinforcements have not buckled away beyond the peak load because of the presence of the reinforcing steel fibers in UHPC. Correspondingly, the steel ties spacing proportionally affects the load carrying capacity of columns as presented hereinafter.
Highlights
The Ultra-high Performance Concrete (UHPC) utilization in civil engineering structures has rapidly progressed in recent years
The objective of this research is examining the influence of steel ties extent variation on the UHPC short columns axial strength and determining a strength and ductility improvement provided by UHPC columns
1) The ultimate axial strength of UHPC columns is increased by 166.7 %, 197.1 % and 184.2 % when compared to the same transversal and longitudinal reinforced NSC columns
Summary
The Ultra-high Performance Concrete (UHPC) utilization in civil engineering structures has rapidly progressed in recent years. Artistic and mechanical competence have been some of the terms which have placed UHPC structures in the lead. UHPC extraordinary characteristics have made it widespread and commonly used in structural applications [1,2,3]. High strength materials influence on column carrying capacity has been investigated and showed that materials strength and confinement have significant impact on load carrying capacity for various geometry setups [4]. Five UHPC columns and three NSC columns, have been tested by a concentric axial compression load till a failure load has reached. The test results are potentially significant data sets for developing UHPC columns design models
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