New connecting methods for CFST members and the implementation of CFST structures in mid-rise and low-rise buildings

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K04771
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 23010:Building structures and materials-related
• Research Institution: Kobe University
• Principal Investigator: Fujinaga Takashi 神戸大学, 都市安全研究センター, 准教授 (10304130)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: CFT構造 / 柱梁接合部 / 柱継手 / 孔あき鋼板

Outline of Final Research Achievements

A structural system of concrete-filled steel tube (CFST) using a through beam type beam-to-column connection and a new column splice with perforated steel plates were proposed. A structural performance evaluation method was presented to expand the use of CFST structures in mid-rise and low-rise buildings. Experiments for evaluating 1) performance evaluation of CFST column splices using perforated steel plates and 2) evaluation of performance of the through beam type beam-to-column connections were conducted.
The pull-out strength of the perforated steel plates were proposed from the pull-out experiments on the perforated steel plates. Tensile performance of the CFST column splices were also evaluated using the proposed tensile strength of perforated steel plates. .
The performance of both the thorough-beam-type CFST beam-to-column connections and the orthogonal direction to the through beam were also presented.

Free Research Field

鋼コンクリート合成構造

Academic Significance and Societal Importance of the Research Achievements

梁貫通形式接合部の優れた接合部性能を提示しており，貫通梁方向のみならず貫通梁と直交する方向の接合法も提案している．隅肉溶接のみで形成される梁貫通形式接合部の利用拡大につながる．
次に鋼管拘束状態での孔あき鋼板の引抜き性状に関する研究は皆無であったが，引抜き耐力の提案まで行っており，初期ずれ剛性の高さを有効に利用できる鋼コンクリート間のずれ止めの建築分野での適用が期待できる．また，孔あき鋼板を用いた新しいCFT柱継手は超高強度鋼材同士の継手等でも継手強度不足分の補完法として適用の可能性がある．
提案する構造形式は，構造性能に優れており，施工の簡素化に大きく貢献する．