THE SAFETY ANALYSIS OF SUSPENSION SUPPORT TRUSS ON TOP OF LARGE-DIAMETER SILO UNDER CONCRETE CONSTRUCTION

The steel-tube truss supporting system made of rotating-fastening members was studied，a FE model of the remaining structural model was established by ANSYS software to do experimental research and analyze local cable failure or member failure of the support platform during silo construction，which would occur. Two of the most unfavorable conditions of construction were considered，one was the bearing capacity of the structure when local cable failed，the other was local stressed member failure. The results showed that when failure occurred in the first lap suspension strand with maximum tension，the rest of the strand through the stress redistribution，truss vertical displacement increased slightly，strand stress increased，which could still provide truss to undertake construction load. There would be less impact after the members with largest stresses of the bottom chord，as well as the upper chord and the diagonals of the truss failed，which could not influence the ability of the structure to bear construction loads，hence the support system has a higher security.