Tests of R/C Beam-Column Joint with Variant Boundary Conditions and Irregular Details on Anchorage of Beam Bars

Abstract eng:
Ten half-scale reinforced concrete beam-column joint sub-assemblages were loaded to failure by statically cyclic loading simulating earthquake loading, to obtain fundamental data including stress in bars after yielding and joint deformation. The test parameters were (1) boundary conditions and loading types for specimens with identical form, section and bar arrangement, (2) the forms of specimens with identical boundary condition and loading type, (3) with or without transverse beams and (4) details on anchorage of beam bars in interior and exterior joints. The test results indicated that (1) in some case of damage of joints were severe, maximum story shear were lower than predicted story shear at ultimate strength of beam in spite of beam bars were yielded, (2) the rotations of four parts of the joint divided with diagonal cracks were dominant in story drift deformation in case of joint failure after yielding of beams, (3) in case of damage of joints were severe, bond actions of beam bars or column bars passing through the joints kept low level and (4) poor anchorage length of beam bars in exterior joints led lower story shear capacity, yielding of column bars and severe damage in the joints.

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