RC造L字形柱梁接合部の定着劣化に起因した破壊メカニズムに関する基礎的研究

概要

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Some previous test shows that the exterior beam-column joint at top floor (L-joint) has different ultimate strength in both inside-corner-opening (joint-opening) and inside-corner-closing (joint-closing) actions. It is thought that each action has the different failure mechanism caused by degradation of anchorage capacity. The objective of this paper is to discuss the failure mechanism caused by degradation of anchorage capacity of L-joint in order to explain the cause of different ultimate strength in both joint-opening and joint-closing actions. One specimen which have short tail anchoring length of beam bent bar is tested under statically cyclic lateral loadings. From the result, it is found that the decrease of story shear is attributable to the degradation of moment resistance, which occurs due to the decrease of tensile forces in beam top and bottom bars and the reduction of distance between stress resultants. The failure mechanism of L-joint is caused by degradation of anchorage capacity of beam longitudinal reinforcements in joint, is proposed and the validity of the failure mechanism is confirmed by 4 specimens.
一般社団法人日本建築学会の論文
2004-03-20