Lift systems are susceptible to damage when building is subjected to strong earthquake motions. The counterweight - guide rail and car guide rail systems suffer from earthquake-induced vibrations. The most common mode of failure is the counterweight derailment. This paper reviews the dynamic phenomena and presents a model to study, to predict and to mitigate the effects of the seismic responses of guide rail – counterweight/ car – suspension systems. The application of a Tuned Mass Damper (TMD) is a convenient method to reduce the guide rail-counterweight/ car response and to control the system operating under seismic conditions. In the TMD arrangement vibrations of the counterweight/ car can be suppressed and the stresses in the guide rails reduced by the application of an auxiliary spring – damper - mass system attached to the main structure. In the counterweight system a part of the counterweight mass can be used as the auxiliary mass. The performance of the TMD can be improved by the application of an actuator force determined by a suitable feedback control algorithm.
|Number of pages||9|
|Journal||Lift and Escalator Symposium|
|Publication status||Published - 20 Sep 2017|
- Guide rail
- seismic excitation
- dynamic response
- tuned mass damper