Structrual damage estimation by detecting nonlinearity in acceleration response

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K06286
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Building structures/Materials
• Research Institution: The University of Tokyo
• Principal Investigator: Iyama Jun 東京大学, 大学院工学系研究科(工学部), 准教授 (30282495)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 加速度応答 / 高次微分 / 損傷検知 / 地震

Outline of Final Research Achievements

When the building is subject to seismic ground motions and some of the structural members are damaged, the vibration characteristics of the building will change dramatically at that moment, causing discontinuities in the response. In this research, in order to detect this discontinuity and detect the damage of the structural member, a detection method using the second derivative of the acceleration, referred to as "snap", is proposed. Since snap is represented by a simple mathematical expression, the detection threshold and applicable range of the method can be easily calculated in advance. In this research project, this method was applied to the measurement record of vibration analysis and shaking table tests, showing that the detection result agreed with the theory.

Free Research Field

建築構造