Full-scale Tests for Seismic Performance Verification of Steel Building Structures with Hysteretic Dampers

建築構造物の耐震改修・再生に活用できる履歴ダンパーの効用を実証する実大構造物実験に取り組んだ。地震エネルギーの吸収能力の高さが既に実証されている座屈拘束型のダンパーを使い、施工時の接合品質が安定した高力ボルト接合を主体とした新しい構造形式が提案されており、これを用いた柱梁接合部を対象とする部分架構と、3層の実大立体骨組を対象とする2つの実験プロジェクトに取り組み、その力学挙動と耐震性能を検証した。This paper presents an innovative structural system, named weld-free system, developed to overcome the difficulty in the quality assurance encountered inconstruction of steel moment resisting frames with conventional welded connections.The proposed structural system adopts a mechanical joint equipped with metallicyieldingdamper as beam-to-column connection, wherein slip-critical joints are made byrecently developed super high-strength bolts. The structural configuration and loadcarryingmechanism of the weld-free system are described herein. Key features of thesuper high-strength bolts are also introduced. Consequently, two series of experimentalverifications of weld-free steel structures are presented. The first series was conductedon three full-scale models of weld-free beam-column subassemblies and one base-linespecimen with conventional welded connection. The second series was performed onthe whole full-scale three-story weld-free building. The two test series clearly reveal theefficiency of the weld-free system in enhancing large and stable hysteresis loops, whilebeams and columns above the base can be proportioned to remain elastic under thedesign earthquakes.建築構造物の耐震改修・再生に活用できる履歴ダンパーの効用を実証する実大構造物実験に取り組んだ。地震エネルギーの吸収能力の高さが既に実証されている座屈拘束型のダンパーを使い、施工時の接合品質が安定した高力ボルト接合を主体とした新しい構造形式が提案されており、これを用いた柱梁接合部を対象とする部分架構と、3層の実大立体骨組を対象とする2つの実験プロジェクトに取り組み、その力学挙動と耐震性能を検証した。This paper presents an innovative structural system, named weld-free system,developed to overcome the difficulty in the quality assurance encountered inconstruction of steel moment resisting frames with conventional welded connections.The proposed structural system adopts a mechanical joint equipped with metallicyieldingdamper as beam-to-column connection, wherein slip-critical joints are made byrecently developed super high-strength bolts. The structural configuration and loadcarryingmechanism of the weld-free system are described herein. Key features of thesuper high-strength bolts are also introduced. Consequently, two series of experimentalverifications of weld-free steel structures are presented. The first series was conductedon three full-scale models of weld-free beam-column subassemblies and one base-linespecimen with conventional welded connection. The second series was performed onthe whole full-scale three-story weld-free building. The two test series clearly reveal theefficiency of the weld-free system in enhancing large and stable hysteresis loops, whilebeams and columns above the base can be proportioned to remain elastic under thedesign earthquakes