Guidelines for structural health monitoring systems on tall buildings and a case study

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2021-2-15

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Gümüş, Oğuzhan

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The new Turkish Building Earthquake Code requires real-time monitoring of the structural response of buildings of Earthquake Design Class 1 and 2 that are taller than 105 m. Structural health monitoring (SHM) systems on tall buildings have to comply with the SHM Guidelines by the Disaster and Emergency Management Presidency of Turkey, developed as part of two research projects that were undertaken at METU and Bogazici University. Two tall buildings in Izmir and Istanbul, respectively, were instrumented as case studies for the SHM systems on tall buildings per the new Code. This thesis presents the development of the SHM Guidelines and the instrumentation of a 216 m tall office building in Izmir, whose structural system consists of reinforced concrete (RC) core shear walls, RC moment-resisting frames with circular composite columns, and buckling-restrained braces at two mechanical floors. Structural response of the building is currently monitored in real time by a dense network of 27 channels of accelerometers. Structural system dynamic properties of the building for the first four translational modes in both East-West and North-South directions and the first four torsional modes were identified from the ambient vibration records. Structural responses of the building recorded during the earthquakes in 2019 with moment magnitudes Mw 3.9–6.0 and epicenters 15–283 km away from the building were analyzed. A finite element structural model of the building was developed. Natural vibration frequencies and vibration mode shapes from the finite element model agreed well with those from the system identification of the building.

Subject Keywords

Ambient Vibration, Dynamic Properties, Earthquake Response, Structural Health Monitoring, System Identification

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https://hdl.handle.net/11511/89732

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

O. Gümüş, “Guidelines for structural health monitoring systems on tall buildings and a case study,” M.S. - Master of Science, Middle East Technical University, 2021.