The shaking table tests are carried out to examine the seismic responses of rocking structural systems with yielding base plates (base plate yielding systems). When subjected to a strong earthquake ground motion, these systems can cause rocking vibration with base plate yielding to reduce the seismic responses of buildings. In the tests, the seismic responses of test frames are compared with those of fixed-base systems and simple rocking systems. The test frames are the steel frames of one-third scale which have one bay and five stories. The total height and width are 5 and 2 meters, respectively. In tests of the base plate yielding systems, the yielding base plates are attached at the bases of these frames. Furthermore, to predict the seismic responses of base plate yielding systems, such as up-lift displacements, base shears and roof displacements, we propose a simple prediction method using an equivalent single degree-of-freedom (SDOF) system. It is concluded that the base plate yielding systems can reduce effectively the seismic response of building structures and their seismic responses are predicted by the proposed method appropriately.
We are now developing the rocking structural system that can reduce earthquake responses of building structures by causing rocking vibration on them under appropriate control. This paper examines applicability of this system to building structures based on case studies using four realistic steal planer frame models which have 5 stories and 1 bay. All models have the same height and width, which are 18 m and 6 m respectively. But they have the different first
natural period. These values range from 0.384 s to 0.729 s. The case studies are executed using a numerical simulation method. Furthermore, we propose simple prediction method for earthquake responses of the rocking structural systems using the equivalent one mass model. It is concluded that the rocking structural systems can reduce seismic responses of building structures effectively, and these response values can be predicted by the proposed method appropriately.
We are developing the rocking structural systems that can reduce earthquake responses of buildings by causing rocking vibration. This paper aims to examine the effects of the rocking system. To cause rocking vibration under appropriate control, weak base plates are attached at the bottom of each steel column at the first story. When the weak base plates yield during a strong earthquake, the building causes rocking vibration. In this paper, the earthquake responses of this rocking system (the base plate yielding system) are examined comparing with those of the simple rocking system and the fixed-base system by nonlinear time history analyses. The results are summarized as follows: 1) Story shear forces of the base plate yielding systems are reduced as much as those of the simple rocking system. The roof displacements and axial forces are less than those of the simple rocking system. 2) The roof displacements and axial forces of the base plate yielding systems are almost similar to those of the fixed-base system under a certain input level. It is concluded that the rocking system with weak base plates can reduce earthquake responses of buildings.
Conference Committee Involvement (2)
20th International Conference on Optical Fibre Sensors
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.