<title>Shaking table tests on earthquake response reduction effects of rocking structural systems</title>

Abstract

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.

Self-centering seismic-resistant structures: Historical overview and state-of-the-art

“…Wada et al (2001Wada et al ( , 2009 proposed a truss-column structure with column splices yielding under tension while allowing separation of column segments. Midorikawa et al (2002Midorikawa et al ( , 2003Midorikawa et al ( , 2006Midorikawa et al ( , 2008 performed numerical studies and shake table tests on MRFs and concentrically braced frames (CBFs) with base plates designed to yield and uplift. Tremblay et al (2008b) tested a 50% scale two-story rocking steel CBF with viscous dampers at the column bases.…”

Seismic performance of buildings with structural and foundation rocking in centrifuge testing

“…In the simplest form of structural rocking, a rigid block is considered rocking on a rigid base. For this configuration, it is known that larger blocks are less likely to overturn than geometrically similar smaller blocks, that they should have their own rocking spectra, and that generally their rocking behaviour is chaotic …”

“…Recognising that allowing structural rocking limits the base overturning moment that is resisted by the structure, but may result in large rigid body displacements, the rigid block type of superstructure was extended to structural systems that are equipped with post‐tensioning and special damping devices to suppress large rotations during rocking. The type of damping device can vary from shear elements and bending elements to tendons . While these systems have an inherent recentring capability, they have typically been studied on a rigid base.…”

“…For this configuration, it is known that larger blocks are less likely to overturn than geometrically similar smaller blocks, that they should have their own rocking spectra, and that generally their rocking behaviour is chaotic. [3][4][5][6][7] Recognising that allowing structural rocking limits the base overturning moment that is resisted by the structure, but may result in large rigid body displacements, the rigid block type of superstructure was extended to structural systems that are equipped with post-tensioning and special damping devices to suppress large rotations during rocking. The type of damping device can vary from shear elements 8 and bending elements 4 to tendons.…”

Research and Development on Smart Structural Systems in U.S.-JAPAN Cooperative Structural Testing Program

“…4. From the test results, it is concluded that the base plate yielding systems are able to reduce effectively the seismic response of building structures (Azuhata 2002;Midorikawa 2003aMidorikawa , 2003bMidorikawa , 2003c.…”