Design Technology to Prevent Complete Collapse of Steel Moment Resisting Frames Subjected to Extreme Earthquakes

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K04363
• 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: Osaka Institute of Technology
• Principal Investigator: Mukaide Seiji 大阪工業大学, 工学部, 准教授 (20423204)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 鋼構造 / 倒壊 / 合成梁 / 地震応答解析

Outline of Final Research Achievements

Large deformation loading tests were conducted on composite beams (beams integrating concrete floor slabs and steel beams), which are often used in steel structural buildings, under the assumption that they are subjected to earthquake motion in two horizontal directions. This experiment confirmed that the bearing capacity deteriorates earlier when subjected to loads in two horizontal directions than when subjected to loads in one horizontal direction. An analytical model that can evaluate such behavior was proposed, and through seismic response analysis of steel-structured buildings using the proposed model, it was confirmed that the buildings tend to collapse earlier than conventional analytical models.

Free Research Field

建築構造

Academic Significance and Societal Importance of the Research Achievements

耐震設計で想定される地震動を上回る地震動に対して，鋼構造建築物が倒壊するまでにどの程度の余裕を持っているのか把握することは重要である．本研究成果に基づいて，地震応答解析のためのモデルを構築することで，鉄骨柱や鉄骨梁の局部座屈だけでなく，合成梁の耐力劣化を考慮することで，より高精度に鋼構造建築物の倒壊挙動を把握するためのシミュレーションが可能となった．