Frequency‐independent hysteretic dampers for mitigating wind‐induced vibrations of tall buildings

Abstract

Summary Mitigation of wind‐induced vibrations in tall buildings has been taken seriously for decades for the safety of the load bearing members, nonstructural elements, and the building envelope, as well as for the comfort of the occupants. Among various technologies to mitigate these vibrations, tuned mass dampers with various improvisations, active or semiactive controls, and viscous dampers are proposed and used extensively. Although these technologies are dependent on the frequency of vibration, research on frequency‐independent hysteretic dampers for mitigating wind‐induced vibrations are quite limited. This paper evaluates the efficiency of hysteretic dampers in suppressing wind‐induced vibrations. Inelastic dynamic wind‐load analyses are performed with two regular three‐dimensional buildings and one 76‐story benchmark two‐dimensional building. It is found that hysteretic dampers perform exceedingly better than the state‐of‐the‐art control systems because they can absorb energy near the natural frequencies of the parent structure, as well as within the frequency bandwidth of windstorms.

Fatigue Damage of Stayed Cables Due to Buffeting Induced by Eastern-Zhejiang Typhoon

“…Studies have been carried out to estimate the wind-induced fatigue damage and long-term condition assessment of cable-stayed bridges and suspension bridges, such as the fatigue life estimation for Yangpu Bridge in Shanghai [1] and evaluation of typhoon induced fatigue damage for Tsing Ma Bridge in Hong Kong [2,3]. The efficiency of hysteretic dampers in suppressing wind-induced vibrations is evaluated by Ali et al [4]. These papers are focus on the evaluation of wind-induced fatigue damage of steel decks of long span bridges.…”

Vibration reduction on a cantilever Timoshenko beam control subjected to combined effects of wind and earthquake loads using damped outriggers

“…Many structural engineering structures, such as bridges, tall-buildings [1,2,40], railways [3] and nuclear power plants [4] around the world, still suffer from the vibrations induced by winds or earthquakes during their lifetime. In recent decades, these mentioned natural disturbances are considered as the most destructive.…”