地震による近接建物の衝突

Abstract

For example, one structure separated by an expansion joint is composed of two adjacent structures. The collisson of such structures may occur due to earthquake excitation. In this paper the structure is simulated to one-mass system and the vibration after the collision is discussed. In the first section it is assumed that tthe collision completes infinitesimal period, so that the displacements of the masses keep the same values before collision, while the velocities change instantaneously. The classical theory of collision is adopted. In the second section an elastic buffer is installed at one of the structures. The buffer comes in effect during the process of collision, enabling to estimate the gradual chanse of displacements as well as velocities, collision duration and compressive force induced in the buffer. In this approach the vibration thory of coupled one-mass system is applied. A sieries of numerical examples shows that the effect of collision is more essential for the structure having smaller mass, however, for the other structure having larger mass the maximum displacement becomes larger in the collision opposing direction than that of excited vibration without collision, whichever the collision with or without buffer is concerned and even by the plastic collision.