Due to the problems left over from construction and the increase of service load,a grid structure project has hidden trouble of quality and safety.This paper systematically introduces the reinforcement scheme of the grid structure,the compression rods are strengthened by using thin-walled channel steel,thin-walled rectangular pipe or angle iron as the external constraint element.The tension rods are reinforced by adopting the double channel steel to increase the cross section.The bolts are reinforced by welding drum joints on the original bolt ball joints or by adding high strength pull screws.MST and NIDA software are used to verify the structure model and direct analysis method is used to calculate the bearing capacity of the grid.Strengthening plans are introduced and refined finite element analysis is carried out on the reinforcement scheme of the compression rod.The load-displacement curves and failure modes of reinforced and unreinforced rods are compared.The results show that,after reinforcement,the bearing capacity of rod is increased by 15％～33％and the failure mode changes from unstable failure to strength failure.After the overall reinforcement is completed,under the condition of increasing loads and considering the initial and overall defects,the grid structure can meet the requirements of Unified Standard for Reliability Design of Building Structures(GB 50068-2018).
grid structurestrengthening designdirect analysis methodfinite element analysis
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