Abstract
The purpose of this study was to evaluate the structural performance of steel fiber reinforced concrete (SFRC) coupling beams. Reversed cyclic loading tests were performed with full-scale specimens. The main variable for the tests was the volume fraction ratio of the steel fibers. The results showed that the maximum strength was increased by about 11% with 1% of steel fibers incorporated, and about 24% when the ratio of mixed fibers was doubled to 2%. Because numerous microcracks occurred, decreased crack width due to the bridge effect was observed with the steel fiber reinforcement. Increased diagonal tension crack angles and energy dissipation also appeared as the volume fraction of steel fibers increased. The contribution of shear to the total deformation was decreased while the contribution of rocking was increased as steel fibers were added. Considering the results of these experiments, it can be concluded that steel fiber reinforcement affects the deformation of coupling beams in various ways, and should be considered when estimating the effective stiffness of such beams when SFRC is introduced.
Highlights
Shear wall systems with reinforced concrete can effectively resist lateral loads, such as wind loads and seismic loads, and are widely adopted in high-rise buildings due to their high stiffness. Because of their mechanical or architectural components, the introduction of such systems can lead to the occurrence of openings, which in turn can require the implementation of coupled shear walls that have to be interconnected with coupling beams to transfer the load [1]
If the coupling beam has sufficient stiffness when the same lateral load is applied to the coupled shear wall system, less stress is applied to the coupled wall than the system in which the wall and the beam are connected with pins and it has greater resistance to lateral load
The main variable parameter was set as the volume fraction of steel fibers, The purpose of this study wastotoperform assess thethe structural performance of steel fiber reinforced concrete (SFRC)
Summary
Shear wall systems with reinforced concrete can effectively resist lateral loads, such as wind loads and seismic loads, and are widely adopted in high-rise buildings due to their high stiffness. In the case of a fixed connection, as, the system behaves as a single cantilever member, resisting exterior moment In this case, stress is distributed linearly through the whole coupled shear wall. Lequesne et al [11] performed reversed cyclic loading tests by fabricating two large-scale four-story specimens for coupling beams and walls using highfabricating two large-scale four-story specimens for coupling beams and walls using highperformance fiber-reinforced concrete (HPFRC). Since SFRC hasapplied higher shear strength andcoupling ductility,beams Most of these studies ductility when applied to conventional coupling beams. Since relatively little research exists about the formance improvement of conventional coupling beams, this paper assesses the structural performance improvement of conventional coupling beams, this paper assesses the strucperformance improvement of conventional coupling beams with steel fiber reinforcement. Tural performance improvement of conventional coupling beams with steel fiber rein2.forcement
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