Experimental Investigation On The Mechanical Behaviour And Stability Of Full Cuplock Steel Tubular Scaffolding

Full cuplock steel tubular scaffolding is advantageous not only in good integrity high,joint strength,bearing capacity and safety,but also function and construction efficiency,its' use of cuplock steel tubular scaffolding is becoming more and more common in the construction site.However,The design content of cuplock steel tubular scaffolding in the current design specifications,the Safety and technical code for frame scaffoldings with cuplock in construction(JGJ166-2016),is not perfect.And because scaffolding engineering accidents are common,people pay more attention to the safety and stability of cuplock steel tubular scaffolding.In this paper,the influence of step pitch and diagonal bracing on the mechanical behavior,bearing capacity and stability of the test specimens is compared and analyzed through experiments,and the test conclusion is verified by finite element simulation.Four groups of cuplock steel tubular scaffolding are designed,comparison of different arrangements of diagonal bracing and step pitch show different influence on the failure mode and bearing capacity of cuplock steel tubular scaffolding,The influence of the diagonal bracing and step pitch on the ultimate bearing capacity of the test specimens is analyzed and condusions are as follows:(1)The load-bearing capacity and the overall stiffness of cuplock steel tubular scaffolding is increased by diagonal bracing,with the displacement decreased.Diagonal bracing can effectively improve the bearing capacity and stability of cuplock steel tubular scaffolding,so that attention should be paid to the rational layout of the diagonal bracing in construction.The decrease of lift height of cuplock steel tubular scaffolding increase the bearing capacity,stiffness,safety and stability.step pitch should not be too large in the process of setting up.Neith reducing lift height or adding diagonal bracing can increase overall bearing capacity of cuplock steel tubular scaffolding.However,comparatively,the addition of diagonal bracing is more effective than reducing the step pitch in improving the bearing capacity.(2)The influence rule of diagonal bracing and lift height on the failure modes of each specimen are obtained by comparing the horizontal displacement and vertical displacement of 4 specimens.The test results show that the deformation and bearing capacity of the frame are improve by diagonal bracing;and the decrease of the lift height can effectively restrain the deformation of the frame and improve the bearing capacity of the frame.(3)Determined the change of the plane of the bowl joint and the change of the bending moment of the crossbar by the strain value of data acquisition system.The influence rule of diagonal bracing and lift height on the failure modes of each specimen are obtained by comparing the vertical strained strain and bending moment strain of 4 specimens.The test results show that the diagonal bracing change the force situation of the frame body,uniform the force and improve the stability of the frame;Decrease of the lift height can effectively restrain the deformation of the frame,reduce the force of each layer and improve the stability of the frame.(4)According to the results of experimental research,the finite element model of cuplock steel tubular scaffolding was established with ANSYS software,and the ultimate bearing capacity and failure mode were analyzed.Compared with the test results,the simulation results were basically consistent with the experimental data.