Analysis of Mechanical Model for Cantilever Scaffolding with Load-bearing Flower Basket Bolt Fastening Inclined Tie Rods
The cantilever scaffold with tightened turnbuckle-type diagonal brace is a resource-saving and efficient new type of cantilever scaffold commonly used in various regions in recent years.Its greatest advantage lies in the full participation of the diagonal brace in force bearing after being tightened by turnbuckles,with the cantilever steel beams fixed to the structure's side using bolts.Safety technical standards for this type of cantilever scaffold have been introduced in various regions,but most standards simplify the force-bearing model of the cantilever scaffold as follows:the cantilever steel beams bear the full-height load,the diagonal braces participate in force transmission,and the anchor ends of the steel beams are hinged.Under working conditions where no temporary support is provided at the bottom of the cantilever structure,before the cantilever steel beams are installed,the steel beams are in a cantilever stress state,with large bending moments borne by the semi-rigid embedded ends.However,this unfavorable calculation condition is often overlooked in most local standards.This paper conducts a thorough analysis of the mechanical state of the cantilever steel beams under various working conditions,proposes a two-stage calculation method for situations without temporary support at the bottom,and overlays load effects.Furthermore,it derives the formulas for calculating the rotational stiffness and rotation angle of the embedded end nodes,providing a basis for precise calculations of internal forces and deformations in cantilever structures.
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