Stability Analysis Of Clasp Scaffold Based On The Secondary Development Of ABAQUS

ABAQUS is a large comprehensive commercial finite element simulation software with generalised software analysis modules for complex structural stress analysis in many fields of science and technology,but does not develop special analysis modules for specific engineering structures.The process of finite element analysis of coiled scaffolds involves a lot of repetitive calculation work,resulting in a long pre-processing module,which requires the user to have a very solid theoretical analysis foundation and computer operation skills.This paper focuses on this engineering problem,based on the secondary development of ABAQUS software,designed a calculation and analysis platform for pan buckle scaffolding,which to a certain extent improves the difficulties of tedious and redundant pre-processing operations in the simulation of pan buckle scaffolding in engineering applications,and applies the design platform to the analysis of the stable bearing capacity of pan buckle scaffolding.The main work and conclusions are as follows:(1)In order to simplify the calculation of components,this paper uses Python to develop the ABAQUS reserved software interface for the pan and buckle scaffolding structure.The Python script is written according to the nodes,mutual contact and structural stress characteristics of the pan buckle scaffold structure,which consists of horizontal bars,diagonal bars and uprights,and the GUI interface is developed through the built-in RSG Dialog Builder of ABAQUS,bringing together all the pre-processing modules of this scaffold structure,in order to simplify the finite element analysis,model quickly and carry out the pan buckle scaffold force performance analysis.(2)Based on the experimental research and numerical simulation analysis of the coil buckle scaffold,it is shown that the ultimate load bearing capacity of the frame under the same working conditions decreases with the increase of the adjustable base and adjustable top bracket;compared with the height of the adjustable base,the risk of instability of the frame is greater with the increase of the height of the adjustable top bracket.(3)Based on the structural stability theory and the finite element analysis platform of the pan buckle scaffold,a set of frame from literature 16 and six finite element models of the test pan buckle scaffold were established,and flexural modal and load displacement analyses were carried out on them,and then the simulation results of the secondary development code were compared with the experimental results.The study showed that the results of the numerical simulation analysis and the results of the tests were relatively consistent,with errors within 10%,verifying the effectiveness of the ABAQUS secondary development program and the accuracy of the numerical simulation analysis.(4)On the basis of ABAQUS secondary development program and node optimization algorithm,the effect on the stability performance of pan buckle scaffolding is studied by changing seven geometric parameters such as the diameter of pan buckle scaffolding upright steel tube,wall thickness of steel tube,spacing and step distance of horizontal bar.The results of the study show that in the design and analysis of the pan buckle type load-bearing scaffolding body,it is possible to increase the diameter and wall thickness of the uprights,reduce the upright spacing,the number of steps and the step distance of the horizontal bars,choose the vertical full lap cross sloping bar erection method,and appropriately increase the horizontal sloping bars to enhance the stability of the scaffolding body.The height of the sweeping bar has a certain influence on the stable bearing capacity of the frame,and it is recommended that in the actual project,when the height of the sweeping bar exceeds 400mm,a layer of horizontal diagonal bar should be erected at the lowest level to enhance the overall rigidity of the frame.