Abstract
Reinforced concrete (RC) shear walls are effective in improving lateral stiffness and load-carrying capacity under earthquake and wind loads. According to the level of seismic design, however, the spacing of reinforcing steel bars should be very narrow and complicated, with tight spacing of tied bars, as is the case with seismically special RC shear wall design. The purpose of this study was to investigate the applicability of strain-hardening cementitious composites (SHCCs) in structural walls in order to improve structural performance as well as the complications with reinforcement details. The SHCC was mixed, and mechanical tests showed that the SHCC exhibited high ductile tensile strains above 2.0%, while sustaining the tensile stress after cracks and developing multiple microcracks, avoiding crack localizations. Six specimens of RC and reinforced SHCC structural walls were designed and manufactured with varying reinforcement details, and experiments on wall specimens were carried out under transverse wall-loading tests. These experiments demonstrated that the use of SHCC in structural walls, despite minimum use of reinforcement ratios, showed improved responses to minimize damage and failure caused by localized cracks under bending and shear to compared with the use of normal reinforcement ratios in RC walls.
Highlights
From the late twentieth century, newly projected constructions of high-rise buildings gradually expanded from the West to Asian countries, accompanied by industrial development and an increase in city populations in the region
Cement composite was applied to the design of structural walls, and some conclusions were obtained after evaluating transverse wall loading tests on six specimens of reinforced concrete (RC) and
For specimens designed both with normal and minimum reinforcement ratios, in comparison with specimens of conventional RC structural walls, R-strain-hardening cementitious composites (SHCCs) structural walls specimens provided innovative structural performance with considerable enhancements in yield and maximum load capacities, excellent inhibition of stiffness degradation after cracks were initiated on surfaces of a wall, and efficient retardations of crack localizations so as to improve failure induced by wide opening of crack width on the wall subjected to bending moments or shear forces
Summary
From the late twentieth century, newly projected constructions of high-rise buildings gradually expanded from the West to Asian countries, accompanied by industrial development and an increase in city populations in the region. Climate change worldwide has resulted in the increase in unexpected disasters such as earthquakes, tsunamis, typhoons, and abnormal storms and wind, especially in Central and East Asia. For this reason, the designed load level of wind and seismic forces for buildings and infrastructure has become progressively higher to secure structural safety performance. In the construction of high-rise building structures, reinforced concrete (RC) shear walls are effective in improving lateral stiffness and load-carrying capacity under earthquake and wind loads [1,2,3,4,5].
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