Abstract
This paper presents a procedure for the wind load identification and the results of its practical application. The wind loads are inversely reconstructed in time domain from measured structural response by means of an augmented impulse response matrix. The inherent noise amplification arising from the ill-posed inverse problem is resolved through Tikhonov regularization. In order to increase the accuracy in solving the inverse problem along with the availability of the measured response just at a limited number of sensor locations, the problem is projected onto the modal coordinates. Consequently the modal wind loads are identified in modal subspace for several single degree of freedom systems, whose characteristic parameters are obtained by an operational modal analysis procedure. The structure under measurement is a 9.1 m (30 ft) tall guyed mast consisting of tubular elements. Since the direct wind pressure/load measurements on the structural members are almost impossible in full-scale testing, numerical simulation was also implemented to verify the results of experimental load identification by analogy. The load identification results are provided in time and frequency domain. Numerical simulation, where actual loads are available, confirm the capability of the method in identification of modal wind loads. Then based on the existing analogy between the simulation and practical application results, the identified loads from field measurements are validated.
Highlights
The problem of load identification is an example of inverse problems with application in structural dynamics and vibrations
The major focuse was drawn to the technical aspects of the practical application of the introduced procedure in conjunction with the theoretical bases
The wind loads are recovered in the modal subspace of the structure in time domain from displacement responses, using the augmented modal impulse response matrices
Summary
The problem of load identification is an example of inverse problems with application in structural dynamics and vibrations. For example in [9] the iterative simulations of wind speeds, based on the identified parameters of wind filed of a structure’s site, play an important role in order to provide data for unmeasured points Another approach is to transform the problem into another subspace (e.g. modal subspace) fdiffeeto truncate the number of unknowns to the number of equations, available from the measurement data [10]. In this paper a procedure for the inverse wind load identification and its application to a real case study are presented This novel procedure requires only the response data derived from the field measurement, conducted for the structure undergoing wind vibration. In this study it was focused on the wind load identification of the first
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