Grant-in-Aid for Scientific Research (A).
|Research Institution||Osaka Prefecture University|
TANIMURA Shinji Osaka Prefecture University, Graduate School of Engineering, Professor, 工学研究科, 教授 (30081235)
浅田 和雄 三菱重工業(株), 高砂研究所, 主務研究員
斎藤 年正 日立造船(株)技術研究所, 要素技術研究センター, 主席研究員
TAKABATAKE Hideo Kanazawa Institute of Technology, Department of Architecture, Professor, 工学部, 教授 (20064462)
AKIYAMA Hiroshi Nihon University, Graduate School of Science and Technology, Professor, 理工学研究科, 教授 (80010825)
齋藤 年正 日立造船(株), 技術研究所・要素技術研究センター, 主席研究員
SAITO Toshimasa Hitachi Zosen Corporation, Engineering Technology Research Center, Manager
ASADA Kazuo Mitsubishi Heavy Industries, LTD., Takasago Research & Development Center, Assistant Chief Research Engineer
|Project Fiscal Year
1998 – 2000
Completed(Fiscal Year 2000)
|Budget Amount *help
¥17,900,000 (Direct Cost : ¥17,900,000)
Fiscal Year 2000 : ¥3,000,000 (Direct Cost : ¥3,000,000)
Fiscal Year 1999 : ¥4,900,000 (Direct Cost : ¥4,900,000)
Fiscal Year 1998 : ¥10,000,000 (Direct Cost : ¥10,000,000)
|Keywords||Near-source earthquake / Structure / Fracture / Dynamic response / Analysis / Impact / Solid model / Vibration / 直下型地震 / 構造物 / 破壊 / 動的応答 / 解析 / 衝撃 / ソリッドモデル / 振動 / 鉄骨構造|
Initial transient behavior of a tall-building-model due to a strong near-source earthquake has been numerically studied using the code MSC/DYTRAN.It is found that stresses greater than the yield stress of the column material, for an elastic/plastic building-model, and stresses greater than the tensile strength of the column material, for an elastic building-model, are achieved in many columns of the building-models, in the initial transient stage.
One of unexpected fractures of structures due to the great Hanshin-Awaji earthquake is the fracture of a bridge bearing part of the Nielsen bridge type. The obtained numerical results show that a high stress sufficient to lead to a fracture appears in the upper part of the bridge bearing, when an impact of velocity higher than 5 m/s occurs between the upper and the lower parts of the bridge bearing.
It is also illustrated that the maximum stress values occurred in the transient stage are strongly dependent on the size of the structure and the acceleration profile of the earthquake motion.
In order to secure the inelastic energy absorptions capacity of structural members, the possibility of brittle fracture must be eliminated.
Based on the full scale shaking table test, the ultimate energy absorption capacity of H-section beams influenced by the brittle fracture was minutely observed.
A simple procedure to secure the ultimate energy absorption capacity is summarized as follows.
1.Brittle fracture can be eliminated by detecting FTP condition through Charpy impact test of used materials.When
2.FTP condition is satisfied, the ultimate energy absorption capacity can be estimated on the basis of tensile strength of materials.
3.Since the inelastic deformation capacity of a member is proportional to the stress increase at the end of member, the efficiency in transmitting member's strength at the end of member (joint efficiency) must be adequately evaluated.