Wave propagation in a seven-story reinforced concrete building: I. Theoretical models |
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| Authors: | M I Todorovska S S Ivanovi M D Trifunac |
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| Institution: | a Civil Engineering Department, University of Southern California, Los Angeles, CA 90089-2531, USA;b Civil Engineering Department, University of Montenegro, Podgorica 81000, Yugoslavia |
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| Abstract: | For transient, high frequency, and pulse like excitation of structures in the near field of strong earthquakes, the classical design approach based on relative response spectrum and mode superposition may not be conservative. For such excitations, it is more natural to use wave propagation methods. In this paper (Part I), we review several two-dimensional wave propagation models of buildings and show results for theoretical dispersion curves computed for these models. We also estimate the parameters of these models that would correspond to a seven-story reinforced concrete building in Van Nuys, California. Ambient vibration tests data for this building imply vertical shear wave velocity βz=112 m/s and anisotropy factor βx/βz=0.55 for NS vibrations, and βz=88 m/s and βx/βz=1 for EW vibrations. The velocity of shear waves propagating through the slabs is estimated to be about 2000 m/s. In the companion paper (Part II), we estimate phase velocities of vertically and horizontally propagating waves between seven pairs of recording points in the building using recorded response to four earthquakes. |
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| Keywords: | Damage detection System identification Wave propagation in structures Earthquake response analysis |
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