| Title |
Hysteretic Behavior of Flexural and Shear Walls using High-Strength Concrete under High Axial Stress |
| Abstract |
The hysteretic behavior of flexural and shear walls with high-strength concrete subjected to cyclic lateral loads under high axial stress(0.21f'c) is examined. The study is based on the experimental results obtained from two one fourth scale models(120cmx100cmx8.5cm, 120cmx200cmx8.5cm) tested under the combined action of a constant axial stress and a horizontal load cyclically to failure. The primary objectives of this paper are to examine the influence of the height to width ratio(hw/lw) on hysteretic behavior, such as failure mode, lateral resistance capacity and deformation characteristics etc., of high-strength concrete walls.For flexural and shear walls using high-strength concrete under 0.21f'c axial stress, horizontal load-top displacement curves showed "S" shape hysteresis loops which residual displacement was small. Wall failure starts with nearly vertical splitting at the lower of the compressive zone of boundary(HW1) or of the wall between the deepest flexural cracks(HW7). The lower the height to width ratio, the more extensive is the failure region within the compressive zone. The deformational response of all walls is distinctly non0lenear. The rate of decrease in ductility under 0.21f'c axial stress is higher for HW7 wall with aspect ratio 1.0. The current code provision and semi-empiricalexpression proposed by Hirosawa for walls using high-strength concrete under 0.21f'c axial stress have been evaluated with experimental results. |