The evaluation of the effects of friction in rocking vibration

Abstract

In the structures whose bottoms is not fixed such as home appliances and furniture, the falls and the slip movements are caused by vibrations such as earthquakes. There is an urgent need to develop fall prevention measures in order to reduce the damage caused by falls and slip movements of structures. The purpose of this study is to clarify the effect of changes in the coefficient of friction on the falling and slipping of structures by analyzing the coefficients of static and dynamic friction separately about dynamic behavior when slipping occurs during rocking vibration. As a result of analyzing the rocking vibration that changed the shape of the structure, it was clarified that the structure wasn’t fall and the slip displacement was the smallest under the conditions when rocking vibration occurred and the height of the structure was low regardless of any degree of freedom. It was clarified that the slip displacement was smaller in 2-DOF system by comparing 1-DOF system and 2-DOF system. It is thought that one of the reasons for this is the fact that the rocking angle reduces and collision frequency increases. 2-DOF system has many collisions because it collides not only between grounds and the structure but also between the upper and lower structures. Therefore, it is considered that the energy consumption of 2-DOF system is larger and the slip displacement is smaller than that of 1-DOF system.

Keywords

• falling
• slip displacement
• rocking vibration
• friction
• coefficients of static friction
• coefficient of dynamic friction
• 1-dof system
• 2-dof system