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- 저자 : Yaping Dai (검색결과 1 건)
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Hongkang Zhao,Yaping Dai,Jun Yang,Youzhen Fang,Chengjie Mi,Lingchen Yang,Guojian Li 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.6
The seismic performance of precast reinforced concrete structures has long been a source ofconcern that impedes their use in seismic regions and high-rise buildings. To further optimizethe reinforcement configuration and enhance the seismic performance of the superimposedslab shear wall structures, this research proposed a superimposed slab shear wall withinnovative construction details. Five innovative superimposed slab shear walls and one cast-inplaceconcrete shear wall were designed and tested under low cycle lateral load. The effect ofaxial compression was considered during tests and analyses as well. In this paper, the seismicperformance, including failure mode, hysteretic behavior, load-bearing capacity, lateralstiffness degradation, energy dissipation, and seismic ductility was investigated and analyzed. The experimental results showed that five innovative superimposed slab shear walls and onecast-in-place concrete shear wall exhibited a similar failure mode of flexural-shear failure, anda large area of concrete was damaged and crushed at the shear wall corner. However, the areaof crushing concrete in the cast-in-place concrete shear wall was relatively small. And the areaof crushing concrete in the superimposed slab shear walls increased with the axial compressionratio. For the superimposed slab shear walls, the development of concrete cracks decreasedgradually with the enlargement in the axial compression ratio, while the length of the cracksincreased in this respect. The results indicated that innovative superimposed slab shear wallshad a higher strength capacity and lower lateral-resistant stiffness than the cast-in-placeconcrete shear wall. With the enlargement in the axial compression ratio, the peak strengthcapacity of the superimposed slab shear wall increased obviously, while it degraded rapidlyafter the peak load. It is suggested that the contribution of axial compression to the shear resistcapacity of the inclined section should not be considered in practical design. Meanwhile, theductility coefficients of the six specimens were larger than 2.2, which was in accordance withthe seismic requirements. This investigation could provide effective experimental data forfuture structural seismic performance evaluations and applications of precast superimposedslab shear wall structures.
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