A Study on Seismic Capacity of Overhead Transportation Systems in A High-tech Fab
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Abstract
A Study on Seismic Capacity of Overhead Transportation Systems in A High-tech Fab
In Taiwan, the suspended automated material handling system (AMHS) has become an essential transportation facilities in high-tech factories, meeting the needs of safety, efficiency, and space saving. The cost evaluation for AMHS considers not only the initial purchase price of equipment but also the potential risk of earthquake damage.
In this research, we studied a suspension overhead system (OHS) in clean room.Through full-scale static cyclic loading tests, we observed the displacement fracture strength and failure modes at different stages, and provide reinforcing measures at different connection points. After installing reinforcements for the connections, the new cyclic loading test indicated an increased capacity and the loosening problems at connection points were reduced. As a result, the system strength has effectively improved to the designed structure strength.
Using structural analysis software SAP2000 to build a simulated numerical model,the nonlinear static pushover analysis was performed. We then compared the analysis results to the full-scale experiment¡¦s to understand the internal force distribution.
Finally, the computer model analysis quantified three system reinforcement proposals¡Xeffectively enhancing the system strength with the least number of members added.