Title:
Strengthening of Reinforced Concrete Piers with High Performance Concretes
Author(s):
Khandaker M. A. Hossain, Ali E. Yeganeh, and Philip Loh
Publication:
Symposium Paper
Volume:
358
Issue:
Appears on pages(s):
21-40
Keywords:
axial strength, codes, engineered cementitious composite, high performance concrete, jacketing technology, reinforced concrete pier, strengthening, theoretical model, ultra-high performance concrete
DOI:
10.14359/51740229
Date:
10/1/2023
Abstract:
This research investigates the High Performance Concrete (HPC) jacketing method to strengthen reinforced circular concrete piers/columns. Four different types of HPC jackets such as Self-Consolidating Concrete (SCC), Engineered Cementitious Composites (ECC) and two types of Ultra-High Performance Concrete (UHPC) with three jacket thicknesses of 25 mm, 38 mm and 51 mm, with same reinforcement configuration were used to strengthen
reinforced SCC core piers and analyze behavior. Thirteen pier specimens were tested to failure under concentric axial
load applied through the SCC core. Test results indicated performance enhancement of piers strengthened with UHPC
and ECC jackets, which not only prevented brittle failure but also improved the ductility and energy absorbing capacity
by achieving a superior ultimate axial load capacity increase by more than 90% with a jacket thickness of 33% of the core diameter. Existing Code and analytical equations with reduction factors can be used for predicting axial load capacity of the strengthened piers/columns but choice of equations should be based on types of jacket concrete to ensure safe design.
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