鉄筋コンクリート内柱・梁接合部における通し梁主筋の降伏前の付着挙動の評価

抄録

In this paper using the available data on interior reinforced concrete beam-column joints tested by the authors, the evaluation method of bond behavior of beam bars before yielding passing through the joint has been proposed. Here the several influencing factors were analyzed and quantitatively evaluated. The following conclusions can be made:
(1) The relationship between average bond stress in a joint region (_oτ_av) and tensile strain of beam bars at the column face (_oε_st) was formulated for the single layered bar arrangement and for the outer bars of the double layered bar arrangement, in which the effect of the bar diameter to column depth ratio, concrete compressive strength, axial compressive stress levels of columns, and the ratio of top to bottom reinforcement areas were considered.
(2) Applying the _oτ_av-_oε_st equation, the relationship between average bond stress in a joint and tensile strain at the column face of the inner bars of the double layered bar arrangement (_iτ_av-_iε_st) could also be evaluated by considering the deformation condition due to shear distortion and shear cracking widths of the joint panel.
(3) The strain distribution of beam bars at the column face could be evaluated by considering the relationships of _oτ_av-_oε_st and _iτ_av-_iε_st.