This papa presents conditions to prevent global buckling of pin-ended tube-in-tube buckling restrained braces. When one end of the restraining member is rigidly connected to the pin joint and the sliding joint is adopted at the other end, the deflection of the brace makes an asymmetric curve and the local deformation of the restraining member may occur at the sliding joint. The method to calculate deflection of the core member and bending moment of the buckling restraining member is led theoretically. Validity of proposed methods and conditions to prevent global buckling are verified through parametric study on cyclic loading tests and FEM analysis.%座屈拘束ブレースは，図1に示すように座屈拘束部と接合部で構成され，座屈拘束部は，軸力を負担する芯材と芯材から伝えられる曲げモーメントを負担する座屈拘束材から成る.接合部は，図2(a)に示すようにガセットプレートとブレース接合部が溶接や高力ボルトによって接合される形式（以下，剛接合形式と記す）と，図2(b)に示すようにピン支持部材によって接合される形式（以下，ピン接合形式と記す）に大別される.
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