Abstract
The paper deals with an assessment of the seismic fragility of multi-drum ancient columns in the probabilistic assessment framework of incremental dynamic analysis (IDA). The dynamic response of multi-drum ancient is governed by the motion of stone-drums which can rock and slide individually or in group, individuating different possible collapse mechanisms, which are also depending on ground motion intensity. In this research, two different in geometry columns i.e. different height and number of drums analysed. The columns were modelled using the UDEC software based on the discrete element method (DEM). IDA was carried out for 10 ground motion records with and without considering the vertical component of earthquake excitation, in order to assess also its influence on the resulting fragility. Results are provided in terms of fragility curves and allow evaluating the influence of the geometrical assembly of the columns and vertical component of the ground motions.
Highlights
Natural events such as earthquakes represent a major threat to cultural heritage structures including ancient temples [1, 2]
The dynamic response of multi-drum ancient is governed by the motion of stone-drums which can rock and slide individually or in group, individuating different possible collapse mechanisms, which are depending on ground motion intensity
The paper has presented the results of incremental dynamic analysis applied to two different typologies of classical columns with and without considering the simultaneous effect of the vertical component of the ground motions
Summary
Natural events such as earthquakes represent a major threat to cultural heritage structures including ancient temples [1, 2]. Ancient temples consist of multi-drum or monolithic columns made of marble or limestone. The dynamic performance of ancient freestanding columns has received increasing scientific attention. This was to understand their seismic performance and better select conservation and rehabilitation techniques for their survival during strong earthquakes. In the last four decades, many researchers studied the rocking response of rigid blocks analytically, numerically, and experimentally [4,5,6]. Over the last three decades, advanced computational methods were used to solve numerical procedures to evaluate the response performance of multi-drum columns subjected to strong seismic excitations. An alternative to the available FEM is the Discrete (or distinct) Element Method (DEM).
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