Mechanism of damage-induced local damping and structural health monitoring of bridges based on damping change

2014 Fiscal Year Final Research Report

• Project/Area Number: 23246082
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Structural engineering/Earthquake engineering/Maintenance management engineering
• Research Institution: Saitama University
• Principal Investigator: YAMAGUCHI Hiroki 埼玉大学, 埼玉大学, 学長 (50134474)
• Co-Investigator(Kenkyū-buntansha): MATSUMOTO Yasunao 埼玉大学, 大学院理工学研究科, 教授 (90322023) ; OKUI Yoshiaki 埼玉大学, 大学院理工学研究科, 教授 (40214051) ; ASAMOTO Shingo 埼玉大学, 大学院理工学研究科, 准教授 (50436333) ; MUTSUYOSHI Hiroshi 埼玉大学, 大学院理工学研究科, 教授 (60134334)
• Project Period (FY): 2011-04-01 – 2015-03-31
• Keywords: 構造工学・維持管理工学 / 土木材料 / モニタリング / 振動減衰 / 橋梁健全度評価 / 腐食 / 減衰解析 / model updating

Outline of Final Research Achievements

Damages (such as tension crack, corrosion and partial fracture) and damage –induced local damping increment in steel member, concrete member and steel-concrete interface are first experimentally studied to discuss the mechanism of local damping increased by local damages. The evaluation method of structural health condition for steel, RC and PC bridges is then proposed by developing a hybrid method of experimental and analytical modal syntheses based on ambient vibration measurement and global damping change monitoring. The method of ambient vibration measurement is carefully studied for optimizing it as a system and the identification of global damping change in bridges is refined with FE model updating method. How to implement the proposed method of bridge health evaluation to the Bridge Management System was finally discussed.

Free Research Field

土木工学，構造動力学，維持管理工学，橋梁工学