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Seismic performance of controlled outrigger rocking wall system with different types of energy dissipation devices Qiao, Tianyang

Abstract

Controlled Outrigger Rocking Wall (CORW) system is a novel earthquake resilient system which combines reinforced concrete wall with controlled rocking base hinge and outrigger system. At the end of the rocking base and the outrigger, different dampers are used to provide the supplemental energy dissipation needed, to control seismic response, and to reduce damage on structural walls. In this study, a 100-meter-tall prototype CORW building was designed using Equivalent Energy Design Procedure (EEDP). EEDP allows designers to design the CORW system to achieve different performance objectives under different levels of earthquake hazard. Based on the prototype design, five types of alternative dampers were selected to meet the design requirements. The seismic performance of the prototype CORW system with different dampers was systematically compared. First, hysteretic behaviors of the dampers were obtained from experimental tests. Second, constitutive models of the dampers were calibrated, and detailed finite element models of the CORW were developed. Third, nonlinear time history analyses were done for 25 combinations of dampers, with 39 input ground motions records under three hazard levels. To further validate the analyses, hybrid simulation was conducted, where two dampers were experimentally tested in laboratory, and the remainder of CORW system was simulated in a finite element program. The result shows that EEDP is efficient in designing CORW system with different types of dampers, and the performance of the CORW system is not significantly affected by different types of dampers. Hence, CORW can be used as an efficient alternative seismic force resisting system for high-rise buildings in high seismic zones.

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Attribution-NonCommercial 4.0 International