Abstract
This paper proposes a novel method to estimate the lateral displacement of high-rise structures under wind loads. The coefficient β(x) is firstly derived, reflecting the relation between the structural lateral dynamic displacement and the inclination angle at the height x of a structure. If the angle is small, it is the ratio between the structural fundamental mode shape and its first-order derivative without influence of external loads. Several dynamic experiments of structures are performed based on a laser remote sensing vibrometer and an inclinometer, which shows that the fundamental mode is dominated in the structural displacement response under different types of excitations. Once the coefficient β(x) is curve-fitted by measuring both the structural lateral dynamic displacement and the inclination angle synchronously, the real-time structural lateral displacement under operational conditions is estimated by multiplying the coefficient β(x) with the inclination angle. The advantage of the proposed method is that the coefficient β(x) can be identified by lateral dynamic displacement measured in high resolution by the remote sensing vibrometer, which is useful to reconstruct the displacement accurately by the inclination angle under operational conditions.
Highlights
With the development of innovative structural systems and novel construction technology, high-rise buildings with landmarks are emerging all over the world
This paper proposes a novel method to estimate the lateral displacement of high-rise buildings by fusion of both a laser system and an inclinometer
It is observed that all three curves are nearly same, suggesting that the lateral displacement is accurately estimated by the fitted coefficient β(x) and the inclination angle on the basis of Equation (7)
Summary
With the development of innovative structural systems and novel construction technology, high-rise buildings with landmarks are emerging all over the world. They can be classified into one of three categories according different measurement systems: The first type of displacement estimation method is based on different sensors directly installed on the structure, such as accelerometer [6,7,8], inclinometer [9], or strain gauge [10,11] These economical sensors can estimate real-time and continuous dynamic displacement. RS techniques can provide accurate structural displacement directly with a resolution varying from centimeters to micrometers, these methods are unsuitable in real-time monitoring because it is difficult to achieve a stable reference point in the continuous monitoring campaign when using them These systems are subject to ambient influences such as weather conditions. (4) the real-time structural lateral displacement under wind loads is estimated by multiplying the fitted constant coefficient β(x) with the inclination angle response. Some conclusions are drawn and future work is discussed
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