Title:
Cyclic Behavior of Expanded Slate Lightweight Self- Consolidating Concrete Beam-Column Joints Containing Polyvinyl Alcohol Fibers
Author(s):
Ahmed T. Omar, Basem H. AbdelAleem, and Assem A. A. Hassan
Publication:
Materials Journal
Volume:
121
Issue:
4
Appears on pages(s):
14-26
Keywords:
beam-column joints (BCJs); cyclic loading; ductility; energy dissipation; expanded slate lightweight aggregate; polymeric fibers; stiffness degradation
DOI:
10.14359/51740773
Date:
8/1/2024
Abstract:
This paper investigates the structural performance of lightweight
self-consolidating concrete (LWSCC) and lightweight
vibrated concrete (LWVC) beam-column joints (BCJs) reinforced
with monofilament polyvinyl alcohol (PVA) fibers under quasistatic
reversed cyclic loading. A total of eight exterior BCJs with
different lightweight aggregate types (coarse and fine expanded
slate aggregates), different PVA fiber lengths (8 and 12 mm [0.315
and 0.472 in.]), and different percentages of fiber (0.3 and 1%)
were cast and tested. The structural performance of the tested
joints was assessed in terms of failure mode, hysteretic response,
stiffness degradation, ductility, brittleness index, and energy dissipation
capacity. The results revealed that LWSCC specimens made
with expanded slate lightweight fine aggregates (LF) appeared to
have better structural performance under reversed cyclic loading
than specimens containing expanded slate lightweight coarse
aggregates (LC). Shortening the length of PVA fibers enhanced the
structural performance of LWSCC BCJs in terms of initial stiffness,
load-carrying capacity, ductility, cracking activity, and energy
dissipation capacity compared to longer fibers. The results also
indicated that using an optimized LWVC mixture with 1% PVA8
fibers and a high LC/LF aggregate ratio helped to develop joints
with significantly enhanced load-carrying capacity, ductility, and
energy dissipation while maintaining reduced self-weight of 28%
lower than normalweight concrete (NWC).