Confinement Reinforcement of Reinforced Concrete Tied Columns under High Axial Load
Journal
Lecture Notes in Civil Engineering
Journal Volume
725 LNCE
Start Page
310
End Page
316
ISSN
23662557
ISBN (of the container)
9789819699162
ISBN
9789819699162
Date Issued
2025
Author(s)
Shen, Wen-Cheng
Abstract
Columns serve as pivotal structural elements in frame buildings, responsible for supporting vertical loads and resisting lateral forces. In the context of high-rise buildings, lower-story columns face substantial demands for deformation capacity under seismic loading conditions. Consequently, the ACI 318–14 building code requires the confinement of all longitudinal bars in columns using seismic hooks, especially in scenarios involving high-strength concrete (HSC) or high axial loads. However, the requirement for crossties with seismic hooks at both ends may significantly impact the assembly of column reinforcement cages during field installation. To address this concern, this research proposes an experimental investigation involving full-scale column specimens with a cross-sectional dimension of 600 × 600 mm fabricated using high-strength and normal-strength materials, respectively. These specimens are subjected to quasi-static cyclic loading under a constant high axial load. The experimental findings indicate that alternating the crossties with a 90-degree hook at one end sustains satisfactory seismic performance of the column specimens. This adjustment in detailing shows potential for simplifying the field installation of reinforcement cages for columns employing HSC or experiencing high axial loads.
Event(s)
18th East Asia-Pacific Conference on Structural Engineering and Construction, EASEC 2024, Chiang Mai, 13 November 2024 - 15 November 2024
Subjects
confinement reinforcement
high axial load
lateral drift capacity
reinforced concrete column
ultimate drift
Publisher
Springer Science and Business Media Deutschland GmbH
Type
conference paper