EXPERIMENTAL STUDY ON INFLUENCE OF BENDING RADIUS OF MAIN TENSILE BARS ON STRESS TRANSMISSION IN REINFORCED CONCRETE KNEE JOINTS WITH PRACTICAL DETAIL

摘要

In Japan, the stress transmission of R/C column and beam joints is calculated differently depending on their type of joint. In interior joints, main bars are continued through the joint panel both vertically and horizontally. Thus, the ultimate strength of interior joints is more reliable. However, in knee joints main bars are not continued. Additionally, since there is no load on knee joints from above, frictional force between concrete and main bars weakens and makes the joint panel relatively easy to break under stress transmission. In the previous studies Hotta and Nishizawa (2012), it's concluded that the sufficient inside radius of the main tensile bars that were continuously arranged through the panel from beam to column improves structural performance and prevents bearing failure of the joint panel when the joints were tested in closing direction. The objective of this following study is to show the influence of the inside radius of the main tensile bars which is separated in the joint panel as a practical design under stress transmission by conducting closing load.