Abstract
Based on past experience with earthquakes the aseismicity of RC buildings has been highlighted. Conventionally, studies on improvements in aseismicity have been conducted using methods in which main bars are arranged parallelly. In this paper, an X type arrangement of reinforcement, a new method which has been studied and developed, was adopted as an approach to improve aseismic performance. This approach aims at improving aseismic performance by arranging main bars in diagonal directoins. In this report, emphasis was placed on a design and construction enabling the improvements above.