Seismic evaluation of crane supporting industrial steel buildings

Abstract

The aim of the present study is to investigate the effect of earthquake on regular mill type crane supporting industrial steel frame. To evaluate the seismic performance of the frame , response at supported end of gantry girder( to be referred as point of observation) is studied by performing Equivalent Static ,Response spectrum and Time History Analysis methods . Since the response of the frame is affected by the position of the loads on crane and location of crane on gantry girder ,the analysis is performed considering different positions of crane girder with respect to the point of observation. For the present study the extreme position of crane hook with minimum approach is considered. The results of analysis indicate that when the crane is located at the point under observation the deflections are less and increase when crane moves away. The variation occurs when crane is positioned in spans adjacent to the point of observation and beyond that the variation are minimul. Therefore crane positions next to adjacent spans are not considered in the present study. Comparision of results obtained by the three methods of analysis are compared and discussed. STAAD Pro is used for the design and analysis.