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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Seismic Upgrade of Interior Beam-Column Subassemblages with High-Performance
Fiber-Reinforced Concrete Jackets
Author(s): M. J. Shannag and M. A. Alhassan
Publication: Structural Journal
Appears on pages(s): 131-138
Keywords: beam; concrete; fiber; reinforcement; seismic; strength
Abstract:Simulated seismic load tests on reinforced concrete gravity load-designed (GLD) reinforced concrete frames with interior beam-column (B-C) joints of nonoptimal reinforcing details to resist earthquake are described. The interior B-C joint lacked transverse reinforcement, column lap-splices, and continuous bottom beam reinforcement. In this investigation, ten 1/3-scale interior B-C subassemblages were subjected to reversed cyclic loading under no axial column load or under low levels of axial load. The joints of these subassemblages were typical in geometry and reinforcement detailing to an interior B-C subassemblage of a prototype Jordanian building frame designed before 1970 only for gravity loads. Some of these subassemblages were tested after strengthening using a 25 mm-thick jacket of high-performance fiber-reinforced concrete (HPFRC) all around the joint-column regions. The test results indicated that the seismic behavior of upgraded specimens was improved substantially compared with reference ones; higher load levels were attained, larger energy dissipation was observed, and slower stiffness degradation was also noted. The upgraded B-C subassemblages failed as a result of plastic hinges in the beams, whereas excessive damage to joint region of the reference specimen led to failure. Within the range of the axial loads used in this study, the jackets containing hooked steel fibers (HSF) provided a better confinement and more ductility to the joint region compared with the jackets containing brass-coated steel fibers (BCS).
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