Rocking, wobbling and overturning of the multidrum columns of Baalbek under periodic pulses

Autor: Gebran N. Karam, Josiane Jello, Charbel Beaino, Mazen R. Tabbara
Rok vydání: 2021
Předmět:
Zdroj: Journal of Seismology. 25:1209-1226
ISSN: 1573-157X
1383-4649
Popis: A three dimensional distinct element model was developed for the multiblock Baalbek columns to investigate the response of the existing columns as well as 0.5m and 1m scaled models used in shaking table experiments. Periodic pulses of varying shapes, periods, and accelerations were applied and the critical combinations of acceleration and period that caused collapse were noted. The response and mode of collapse are shown to be dependent on the period and the amplitude of the pulse. Depending on the size of the column and the period of the applied critical pulse three modes of collapse are observed: (1) multiblock rocking/wobbling followed by toppling of one or more blocks; (2) rock and/or wobble then overturn along or outside the applied pulse plane; (3) overturn after one or two impacts along the plane of the applied pulse. The displacement history of the column was plotted alongside the ground motion to visualize and quantify the rocking and /or wobbling. All column sizes showed the same response qualitatively in the acceleration-period space and the wobbling was shown to be confined to a well-defined region. Stability charts delineating the safe-unsafe boundaries showed bi-modal behavior for all pulses tested but with a shift due to the different pulse energy contents. Numerical results compared well with experimental data from shaking table experiments on the scaled columns. The capabilities of the three dimensional numerical modeling approach are confirmed in this work for use as a predictive tool or an archaeoseismic analysis tool for columns and large masonry structures.
Databáze: OpenAIRE
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