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Wave Propagation in an 18-Story Steel Building and the Changes of Wave Filed With the Progression of Damages

Session: Advances in Seismic Interferometry: Theory, Computation and Applications [Poster]

Type: Poster

Date: 4/22/2021

Presentation Time: 11:30 AM Pacific

Description: 

From the aspect of wave propagation, the response of a building can be seen as the traveling of the input wave from the base and multiply reflected by the base and top until the energy of the input motion is consumed by the damping and scattering to the ground. Because wave propagation depends on the properties of upper structures, it is possible to examine the damages of the structure from the changes of characteristics of wave filed, such as the wave velocity, the dispersion, the reflection by inter stories, and so on. In order to demonstrate the damage detection from changes of wave filed practically, in this study, the shake-table test of a 1/3-scale specimen of an 18-story steel building are used. The specimen was excited by a synthesized long-period strong ground motion, whose amplitude was increased by ten steps to lead the structure from elastic condition to the occurrence of plastic deformation, fractures at the beam ends, buckling at the column feet, until the collapse of lower stories. Also, the changes of wave filed under white noise after the progression of damages are examined. Because it is difficult to examine the wave propagation from the waveforms directly, in this study, new wave fields are constructed using the seismic interferometry method as considering the virtual source at the top of the building. The effect of dispersion due to the bending deformation of stories is considered to examine the changes of shear-wave phase velocities with the progression of damages.

Presenting Author: Xin Wang

Student Presenter: No

Authors