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|Title:||Development of an Axial Yielding Energy Dissipation Device for Controlled Rocking Masonry Walls|
|Authors:||Lee Kim, Daniel|
|Abstract:||The damage caused due to a seismic event can leave a city destabilized. However, the negative effects can last much longer because of the inability to reoccupy critical infrastructure systems due to their demolition and eventual rebuild. In order to minimize the recovery time following a seismic event, energy dissipation devices can be installed to absorb the majority of the seismic damage and subsequently maintain the main structure serviceable. One researched solution is by allowing controlled rocking of a masonry wall. A controlled rocking masonry wall uses its own gravity load along with a yielding energy dissipating device as a restoring force to return the wall to its original vertical alignment. Through iteration, a new axial yielding energy dissipation device was designed in the current study to be installed to a controlled rocking masonry wall. The proposed device was designed to provide the required supplemental energy dissipation, while also being replaceable in the event of seismic damage. The device takes inspiration from structural buckling restrained braces, which includes a yielding steel core, a rubber debonding layer, and a confining grout all within a steel casing. The device is bolted into the wall foundation as well as into a special steel portion of the wall that prevents toe damage and provides a rigid section for the installation of the device. Furthermore, the overall design of the new device maintains the footprint of a standard masonry wall. After initial conceptual development of an axial yielding device, half-scale testing was performed to assess the seismic performance of nine specimens with different design parameters. Quasi-static uniaxial testing, through adapters on a uniaxial tester, was performed to simulate the actual boundary conditions for the bolted ends of the specimens. Parameters investigated in the current study included the cross-sectional area of the yielding core, the thickness of a rubber debonding layer, and the effective length of the core. An OpenSees model was then developed to simulate the seismic performance of the new device. The model was validated against experimental results and further verified using mechanics to evaluate the maximum force of the device when designed with different geometrical configurations. The results of the study show promise of both a feasible energy dissipation device and an effective tool for estimating performance prior to conducting detailed design.|
|Appears in Collections:||Open Access Dissertations and Theses|
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|LeeKim_Daniel_A_2019September_MASc.pdf||146.31 MB||Adobe PDF||View/Open|
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