Development and validation of high-capacity resilient outrigger damping system for high-rise buildings

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Viscoelastic Coupling Dampers are used to replace traditional reinforced concrete core beams in coupled wall configurations or installed within outrigger wall systems. Although the development work that has taken place to date has validated the VCD for use in core walls which is typical of buildings up to approximately 250 meters, in order to bring the VCD to its full-potential, it is required to develop, test and validate the VCD with special ductile yielding fuses and lock-up mechanisms in outrigger configurations that are used for super-tall and mega-tall towers. Dynamic real-time full-scale testing of VCDs in an outrigger configuration presents a particular challenge because the damper size is roughly double the size and the dampers are subjected to loads on the order of 3 times larger in certain cases than previously tested VCDs. A further challenge is that the connecting elements of the VCDs to the Reinforced Concrete structure also increase in size and force demands and require special detailing to achieve the required stiffness, strength and especially ductility. The VCD technology also includes a lock-up system that allows the device to respond in the viscoelastic range for all wind loading and low amplitude seismic loading but ensures a reliable yielding mechanism in the connecting steel elements for extreme rare earthquake loading. The proposed research programme will bridge this gap through extensive full-scale dynamic testing of large-capacity VCDs designed for outrigger configurations and complete the technological development that is required for the outrigger configuration with lockup and ductile detailing to be used by engineers in their super-tall and mega-tall building designs. In addition, real conventional and damped high-rise structures will be monitored to provide in-situ data on their dynamic properties, including the levels of inherent damping, and to confirm commonly used modeling assumptions for such buildings.