The Seismic Energy Dissipation Mechanism Of
Rocking Structural Systems With Yielding
Base Plates
Author(s)
T. Azuhata, M. Midorikawa & T. Ishihara
Abstract
The energy dissipation mechanism of the rocking structural system with yielding
base plates is investigated based on seismic response analyses of four steel
planar flame models with five stories and one bay. The potential energy of the
self weight increasing with uplifting and the hysteresis damping capacity of the
yielding base plates are evaluated. Effects of vertical inertia force on the energy
dissipation mechanism including impact effects are clarified. The energy
dissipation of the system corresponding to the maximum momentary input
energy is expressed using the maximum rigid body rotational angle. The
maximum response displacements are predicted considering the energy balance
condition of the system.
Keywords: uplift, rocking, base plate yielding, energy dissipation mechanism,
momentary input energy, response displacement prediction.
1 Introduction
It has been pointed out that the effects of rocking vibration (up-lift response)
reduce seismic damage of buildings subjected to strong earthquake ground
motions [for example, 1-4]. Based on this knowledge, we are now developing the
rocking structural systems with yielding base plates (BPY systems) [5-7]. These
systems can cause rocking vibration, when the base plate attached at the bottom
of each column on their first story yields. The basic idea of the systems is
illustrated in fig. 1. According to our previous studies based on shaking table
tests, it was cleared the BPY systems can effectively reduce seismic responses of
buildings. And we proposed a simplified prediction method for seismic
Keywords
uplift, rocking, base plate yielding, energy dissipation mechanism,
momentary input energy, response displacement prediction.
Related Book
Other papers in this volume
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