Abstract
The dynamic properties of the structure are related to many factors, such as mass distribution, component stiffness, material properties. In addition, environmental conditions may also affect the dynamic characteristics. In this paper, the modal identification of 133 strong earthquakes recorded in a 32-story SRC building structure in Tokyo from 2013 to 2018 is performed first, and then the dynamic characteristics (natural frequency, damping ratio) are obtained. The statistical regression analysis is used to analyze the influence of environmental conditions (temperature, humidity) on the dynamic characteristics of the high-rise SRC building structure, and the change trend of its dynamic characteristics. Finally, the results of the analysis are given to provide experience and basis for the design of similar building structures.
Highlights
With the rapid development of high-rise buildings, dynamic detection and structural health monitoring of high-rise building structures have become important issues
Structural modal parameter identification can be divided into experimental modal identification and operational modal identification; it can be divided into frequency domain identification and time domain identification
This paper is mainly based on the frequency domain identification method of the Frequency Domain Decomposition (FDD) method and the time domain identification method of the Stochastic Subspace Identification (SSI) method to obtain the dynamic characteristics of the structure [3]
Summary
With the rapid development of high-rise buildings, dynamic detection and structural health monitoring of high-rise building structures have become important issues. The response of a structure under earthquakes is closely related to the dynamic characteristics of the structure. The natural vibration period and damping ratio are the main dynamic characteristics of the building. The dynamic characteristics of the structure are related to many factors, such as mass distribution, component stiffness, material properties [1]. Environmental conditions [2] may affect the dynamic characteristics. The modal identification of the strong earthquake records of a 32-story SRC structure for 5 years is carried out, and the corresponding natural frequency and damping ratio are obtained. Through regression analysis, the impact of environmental factors (temperature, humidity) on its dynamic characteristics is revealed. 5-YEAR MONITORING OF THE DYNAMIC PROPERTIES OF A 32-STORY SRC STRUCTURE.
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