Seismic Design and Behavior of Steel Frames with Controlled Rocking—Part II: Large Scale Shake Table Testing and System Collapse Analysis (original) (raw)
2010, Structures Congress 2010
This is the second of two companion papers that investigate the design and behavior of steel braced frames that resist earthquake effects through controlled rocking. By employing vertical post-tensioning and energy dissipating fuses, the controlled rocking systems can sustain large earthquake ground motions with minimal damage and without residual drift. This paper describes a series of large (two-thirds) scale dynamic shaking table tests, conducted at the E-Defense facility in Japan, to validate the system behavior for ground motions with intensities up to and beyond those of the maximum considered earthquake (MCE) level. The tests investigate response with alternative fuse designs and variable post-tensioning. Results of nonlinear dynamic analyses are shown to compare well with the shake table tests, which can be extended to assess the collapse performance of the controlled rocking frames, using procedures outlined in the FEMA P695 methodology to evaluate provisions for seismic design.
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