A Study of Derailment Mechanism of Elevator Counterweight Systems

• Main Authors: Te-hou Shen, 沈德厚
• Other Authors: George C Yao
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/72387204537633008093

碩士 === 國立成功大學 === 建築學系碩博士班 === 91 === This thesis performed shaking table tests on full-scale elevator counterweight (CW) systems currently used in Taiwan. CW were tested for the 8- and 15-passenger systems each corresponding to 5K and 8K CW rail size. Other parameters investigated including: bracket distance (2500 and 2800 mm), tie-bracket, biaxial excitation. The main purpose is to investigate the interaction and derailment mechanism of CW and guide rail systems. Finally, numerical analysis was performed and the results were used to discuss the appropriateness of current design code for elevators. Conclusions from this study are as followings: 1)The Main reason for CW derailment is due to the in-plane impact of CW and rails that enlarges the distance between the two rails to exceed the guide shoes depth. Out-of-plane excitation may deteriorate the above condition further. 2)Tie-bracket installed on CW rail system will improve the seismic capacity of the CW system. 3)Residual deformation of guide rail and rail brackets from a major seismic event may cause deformation large enough to interfere the operation of an elevator. 4)Brackets sizes used in the current practice will deform largely in earthquakes in contrast to the zero-deformation assumption used at the design stage. 5)Analysis results indicate that the widely used 8-passenger and 5K-CW rail system can only be suitable in a limited application in Taiwan based on the latest IBC 2000 code.