本研究では，両側フランジをラグスクリューで固定したドッグボーン付き木鋼ハイブリッド構造の変形性能の定量化と設計用曲げ耐力の算定方法を提案しました。本研究は東工大，日建設計，日鉄エンジニアリングが共同開発している木鋼ハイブリッド構造の研究シリーズの1つであり，2021年に評定取得した構法の根拠となった論文です。我々の提案は，重層構造の柱，柱梁接合部および梁端部周辺に鋼材を用い，フロアシステムに集成材を用いるというもので，1) 保有水平耐力計算状は鉄骨造のDs値を適用できる，2) 全ての部材を木質材料で構成する場合より柱を細くできる、というメリットがあります。木鋼ハイブリッド構造の概要については2021年7月号に出版された木鋼ハイブリッド特集（鉄鋼技術）を御覧ください。論文はこちら
This paper proposes a timber-steel hybrid beam-column connection system. In this system, while the column and the beam-column connection is made by steel, the floor system is made by laminated timber. This system contributes to both the architectural design (slender columns) and the structural design (light weight and R-factor of SMRF.) In the previous paper, dog bone timber-steel hybrid connections, which consist of a dog bone part and a timber-steel hybrid connection that transfers the bending moment of the laminated timber beam to the steel, is proposed. The proposed connection has enabled the realization of a structure with sufficient strength, stiffness and toughness, but the deformation capacity of the connection has not been studied for another cross-sectional dimensions. In this study, based on the previous evaluation equations, an analytical method to derive the history of the M-q relationship by increasing the angle q of the core of the laminated wood to the H-shaped steel of the wood-steel joint, taking the shear force and a single neutral axis calculation were performed to obtain the rotational stiffness Kw, the yielding bending moment My, and the ultimate bending moment Mu of the timber-steel hybrid connection. The validity of the shear force evaluation method and the effect of shear force on the hysteresis properties of the timber-steel hybrid connection are discussed. Four different test specimens (MD600, MD360, CD360 and MS360) are fabricated for the proposed connection with both flanges fixed by lag screws to increase the stiffness and strength of the wood-steel joints. The MD600 is 600 mm height of glued wood and has two bodies with monotonic loading, and the MD360 is 360 mm height of glued wood and has two bodies with monotonic loading. The CD360 is 360 mm height of glued wood and has three bodies with cyclic loading. The MS360 is strength tests of timber-steel hybrid connections, which is 360 mm height in glued wood and has three bodies with monotonic loading. From the joint bending tests, the hysteresis properties and plastic deformation capacity of the proposed connections with dog bone are verified, while the stiffness and holding strength of the timber-steel hybrid connection are verified..