Abstract
The objectives of this research are to clarify the shear behavior of reinforced concrete thin beams with main reinforcement arranged singly and stirrup of no closed-type and to derive the formula to evaluate the ultimate shear strengths. A total of 10 specimens were constructed and tested under simulated seismic loading. The primary test variables were amount of shear reinforcement, compressive strength of the concrete and the shape of stirrup. As the test results, the structural performance is degraded in comparison with R/C beams with main reinforcement arranged doubly and stirrup of closed-type. The reason is as follows.
1. Damage of concrete is concentrated on the core area of cross section.
2. The shear reinforcement effect of stirrup , which is no closed-type, decrease in comparison with stirrup of closed-type. Because of being determined by anchorage ability of 180° hook.
Then being based on above results, the formula to evaluate the ultimate shear strengths of R/C thin beams with main reinforcement arranged singly is developed. Fairly good agreement between experimental and calculated results of the ultimate shear strength is shown.
