Abstract
This study investigates an effect of damping modeling on the dynamic analysis results of masonry structures using a refined version of the distinct element method (refined DEM). The refined DEM can handle two types of damping terms; a damping force acting at a gravity center of each element, and a damping force acting between two elements in contact. To determine appropriate damping terms from several kinds of damping models, it is necessary to understand the difference among damping models. Therefore, this study numerically investigates the difference in free vibration response, failure behavior and collapsing behavior by different damping models. A mass-proportional damping and a local damping are selected as damping terms acting a center of gravity element. In addition, a critical damping and a stiffness-proportional damping are selected as damping terms acting between two elements. Combining these damping terms, three damping models are proposed. By conducting the analysis with these damping models, their characteristics are examined.
