Clarification of redundancy of steel structures at fire and proposals of redundant structures after fire

2023 Fiscal Year Final Research Report

• Project/Area Number: 21H01474
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 23010:Building structures and materials-related
• Research Institution: Nagoya University
• Principal Investigator: Ozaki Fuminobu 名古屋大学, 環境学研究科, 准教授 (40434039)
• Co-Investigator(Kenkyū-buntansha): 鈴木 淳一 国立研究開発法人建築研究所, 防火研究グループ, 主任研究員 (10453846)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 鋼構造 / 火災時リダンダンシー / 火災後レジリエンス / 荷重再配分能力 / 鋼部材

Outline of Final Research Achievements

In this study, to improve fire resistant performance of steel building structures at fire and promote reuse and rapid recovery of them after fire, the behavior of redundancy for an overall steel frame at fire was clarified by fire resistant experiments using steel frame specimens. Furthermore, both fire and post-fire resistance experiments of steel members were conducted, to evaluate those load-bearing performance which is required for the fire damage diagnostics to improve the resilience at post-fire. The resilience-evaluation model of steel frames after the fire was proposed, and the resilience performance was quantified by the parametric calculations. Furthermore, the redundant building at post fire was proposed by those calculation results.

Free Research Field

建築耐火

Academic Significance and Societal Importance of the Research Achievements

鋼構造建築物に対しては、火災時リダンダンシーの既往研究は理論と解析に限定され、実験的に確かめられた現象では無い。また火災罹災後の建築物の早期復旧が望まれるが、復旧・再利用まで配慮した設計法は構築されていない。巨大地震後の大規模火災などでは、通常の消防力も期待できず、建物群はより大規模な火災に被災することが想定され、震災後の早期復旧を図るためにも、火災時の回復力(レジリエンス)が大きな建物が必要である。本課題は耐火安全性の向上と火災後の早期復旧の技術提案を目指し、載荷加熱実験を行うことで建物のリダンダンシーを解明し、また火災後補修・取替え範囲が小さく済む高レジリエントな建物の条件を見出した。