Test And Finite Element Study On Bearing Capacity Of Attached Lift Scaffold

Attached lift scaffold is widely used as a construction platform in high-rise buildings.It has the advantages of good integrity,high construction efficiency,and significant economic benefits.However,at present,the research on the attached lift scaffold focuses on the construction technology,while the overall structure’s bearing capacity,component performance and connection structure are less researched,and the design is still based on experience.Due to not knowing the structural performance of the attached lifting scaffolding,many accidents have occurred.This paper conducts experiments and finite element studies on the structure and component bearing capacity of attached lifting scaffolds.The main contents are as follows:(1)The protective mesh is subjected to an impact resistance test,and the damage test piece is mostly 0.5mm thick.The larger the opening rate,the greater the deformation.In the case of the same opening rate,the specimens with hexagonal openings have the smallest deformation,followed by the square-hole specimens,and the round-hole specimens have the largest deformation.(2)The test and finite element analysis of the general walkway slab and the bottom walkway show that when the frame angle is changed from 50# to 63#,the bearing capacity of the footing board increases by 40.4%,and the bearing capacity of the general walkway slab increases by 12.5%;the thickness of the panel has a greater influence on the bearing capacity Small,1.5mm thickness is enough;under allowable deflection,50# angle steel used for the footing board frame can meet the requirements of use,and it is recommended that the general walkway board frame use 63# angle steel.(3)The anti-tilting,anti-falling and top bracing tests are carried out on the wall-attached support,and the design value of the horizontal bearing capacity of a single support is 22 k N,and the design value of the vertical bearing capacity is 50 k N.(4)The finite element analysis is carried out on the axial compression stability bearing capacity of the frame connected to the long pole and the force of the triangular brace of the inner and outer poles.The length of the connecting square steel,the wall thickness and the number of connecting bolts are smaller than the axial compression bearing capacity of the long pole;The diameter of the triangular brace connecting bolt nut shall not be less than 36 mm.(5)The finite element analysis of the overall structure force under the working conditions and climbing conditions of the attached lifting scaffold was carried out.Under the maximum wind load,the existing frame body could not meet the design requirements of the specification.Adding throwing braces,adding diagonal rods at the top,and increasing the cross-section of the frame vertical rods can greatly increase the force-bearing performance of the frame to meet the design requirements.