Influence of Integral Lifting of Large-span Pipe Truss Roof on Lower Concrete Structure
In order to study the influence of the large-span pipe truss roof of Zhangjiakou Olympic Sports Center Swimming Pool on the lower concrete structure during the lifting process,the influence of different numbers and different arrangement of lifting frames on the deflection of concrete floor and frame beam was analyzed.Five different lifting frame models were designed to study their mechanical characteristics.The results show that the horizontal displacement of the lifting frame model d under wind load is twice that of other models,and the axial force transmitted to the bearing by the four lifting points of the model e under the same vertical load is quite different.The failure of the lifting frame sling is not conducive to the force of the lifting frame,which should be prevented.When the reaction force of the lifting frame support is applied to the beam plate,it only has a great influence on the force point,and has little influence on the other parts.The influence of the combined action of multiple force points on the beam plate is the linear superposition of the influence of multiple single force points on the beam plate.When the frame beam in the weak area is subjected to the reaction force of the lifting frame support,temporary steel column support can be added to the lower part of the beam,and the maximum deflection of the beam can be reduced by about 50%after the support is added.
steel structuresroofspipe trusslifting framefloorsframe beamsfinite element analysissupport reaction forcedisplacement
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