Seismic Design and Testing of Propped Rocking Wall Systems

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Seismic Design and Testing of Propped Rocking Wall Systems

SUMMARY:
A direct displacement-based design (DDBD) methodology is described for Propped Rocking Wall (PRW) systems. A PRW represents a novel seismic force-resisting system that combines passive supplemental damping devices with unbonded post-tensioned concrete rocking walls. The key aspect of the proposed design procedure is the closed-form derivation of the stabilized hysteretic response of PRWs under reverse cyclic loading. This allows the direct application of the DDBD procedure to satisfy desired displacement performance objectives under prescribed levels of seismic intensity. The efficiency of the proposed design procedure and the performance of PRWs are evaluated experimentally through an ongoing earthquake simulator experimental program on a 1:3 scaled PRW specimen designed using the proposed DDBD procedure. Results from the preliminary nonlinear dynamic analyses on the test structure are presented in order to demonstrate its performance under strong ground shaking.

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