Earthquake Response Prediction for Large-scale Low-rise Buildings Based on Microtremor and Earthquake Measurements

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K05027
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 25030:Disaster prevention engineering-related
• Research Institution: Kyoto University
• Principal Investigator: Yoshiki IKEDA 京都大学, 防災研究所, 教授 (70416866)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 低層建物 / 地震被災度即時判定法 / 微動計測 / モード同定 / 振動解析モデル / 地震応答解析 / 振動台実験 / 並進ねじれ振動の連成

Outline of Final Research Achievements

To evaluate seismic responses of a low-rise building, this research proposes how to make a multi-degree-of-freedom linear model based on microtremor measurement. The method is verified through numerical simulations and shaking table tests of a 4-story steel specimen. Multi-setups of accelerometers is established to obtain global modal shapes of the structure with a limited number of sensors. Six buildings were selected to extract general dynamic properties of large-scale low-rise commercial buildings that have different characteristics individually. Even if microtremor sensors are removed from a building, the method can estimate the seismic responses at microtremor sensors' locations without structural design documents. This method will promote to provide building users with useful information about structural damage after an earthquake, because it considers the limited number of installed sensors and requires no design documents in practical applications.

Free Research Field

建築構造

Academic Significance and Societal Importance of the Research Achievements

振動計測記録に基づいて建物の地震被災度を即時判定する方法は、高層建物ではほぼ確立されている一方、不特定多数が利用する大規模低層商業建物では確立されていない。本研究の成果は、大規模低層建物の地震時の揺れを予測するために、微動計測情報のみで建物の地震応答解析モデルを構築する方法を提案し、その妥当性を検証したことである。大規模低層商業建物の地震被災度が即時判定できれば、建物が安全と判断された場合に建物を避難所として提供したり、店舗に残された商品を救援物質に役立てたりすることが可能になる。