Improving performance of a super tall building using a new eddy-current tuned mass damper

Abstract

SUMMARYTwo kinds of methods have been primarily used to improve the vibration performance of high-rise buildings. One approach is to enhance the structural lateral stiffness, which may increase the component size and inefficiently use material. The other approach is to employ vibration control devices, such as tuned mass dampers (TMDs), tuned liquid dampers (TLD) and other supplemental damping devices. This latter approach has proved to be quite economical and efficient, and as such, increasingly used in practice. The Shanghai Center Tower (SHC) is a super high-rise landmark building in China, with a height of 632 m. In order to mitigate its vibration during wind storms, a new eddy-current TMD was installed at the 125th floor. Special protective mechanisms were incorporated to prevent excessively large amplitude motion of the TMD under extreme wind or earthquake scenarios. Results of reduced-scale laboratory tests and field tests are presented in this paper to characterize the dynamic properties of the damping device and validate the fidelity of the numerical results. Results of structural analyses indicate that for SHC the eddy-current TMD was able to reduce wind-induced structural acceleration by 45%-60% and earthquake-induced structural displacement by 5%-15%. The installation of the TMD was completed in December 2014, and the performance observed to date is judged to be good.

Data‐Driven Two‐Level Performance Evaluation of Eddy‐Current Tuned Mass Damper for Building Structures Using Shaking Table and Field Testing

“…In addition, the modal frequencies of the first five modes were also identified and labelled in Figure . Noticeably, the frequencies of 0.110, 0.317, and 0.659 Hz are approximately close to those of the analytical results (Lu et al., ) of 0.110, 0.319, and 0.687 Hz, respectively.…”

“…From the viewpoint of engineering practice, the real‐world EC‐TMD device with complicated configurations is one step forward to the scaled prototype previously used in the lab. The conceptual design, a brief description of the working principle of the EC‐TMD, and the numerically simulated vibration suppression performance of the EC‐TMD subjected to both earthquake and wind excitations can be referenced in a previous work by the authors (Lu et al., ).…”

“…A new eddy‐current tuned mass damper (EC‐TMD) was recently proposed by Lu et al. () to reduce the vibration responses of high‐rise buildings. The feasibility of applying EC damping was verified through small and moderate‐scale free vibration testing, and the control performance was numerically investigated using an equivalent and piecewise model of damping ratio.…”

Study on Adaptive-Passive and Semi-Active Eddy Current Tuned Mass Damper with Variable Damping

“…The Lorentz force in the conductive plate will hinder the relative motion, and the vibration energy is dissipated by the heat of the conductive plate. Lu et al [18] studied the improving performance of a super tall building using a new eddy current tuned mass damper (ECTMD). Bourquin et al [19] introduced the magnetically tuned mass dampers for optimal vibration damping of large structures.…”

Experimental Study on Robustness of an Eddy Current-Tuned Mass Damper

“…Niu et al [43] applied an ECTMD on a bridge to suppress the wind-induced vibrations that occur in the bridge hangers. Lu et al [44] investigated the vibration suppression performance of an ECTMD in Shanghai Center Tower, and the experimental results showed that the acceleration resulting from wind-induced vibration was reduced by 45-60%.…”