Parametric Model And Reliability Research Of Bridge High Support Structure

With China’s increasing investment in infrastructure construction,formwork support system plays an irreplaceable role in bridge construction.However,due to non-standard management of formwork support system,calculation errors,insufficient understanding of potential risks and other reasons,collapse accidents occur frequently in the construction process.On the basis of existing research,in view of the support bar unit quantity,influence factor of safety,more accurate modeling analysis calculation workload big,time consuming,some technical personnel before finite element calculation level is not high or treatment for a long time,the construction site erection of risk analysis of structure is not reasonable,support the phenomenon such as insufficient understanding,this paper analyses in detail the accident cases happened in recent years the main template stents,sums up the factors influencing the stent safety risk.Second modeling calculation based on past experience and the temporary structure regularity,if will support structure of main data form parametric process,through the generation of the parameter control structure model,can largely improve the efficiency of structural analysis,thus using the Python language combined with ABAQUS finite element software to write the template scaffold and bailey beam system parametric program for modeling and analysis,at the same time using the parameterized can also realize the structure optimization analysis.Then ABAQUS parametric modeling was used to build a large number of finite element models to analyze the sensitivity of factors affecting the bearing capacity of high pier support and give advice on setting up.Finally,the sensitivity factors including the step distance of the vertical bar,the thickness of the steel tube wall,the stiffness of the joint,the length of the vertical bar beyond the horizontal bar of the top floor,and the height of the sweeping bar were taken as random variables that had a great impact on the reliability of the scaffold.Meanwhile,the reliability of the template scaffold was studied by combining the reliability theory and Monte Carlo method.The main research contents and results of this paper are as follows:(1)Based on ABAQUS finite element software,the parametric modeling interface is developed with Python scripting language and GUI functions,which can realize the rapid establishment of finite element model and carry out calculation and analysis,solve the modeling tedious and error-prone problems in finite element simulation,and greatly improve the reliability and work efficiency of modeling(2)Carry out the high pier load-carrying capacity influence factors analysis,quantitative full framing of the stem height,height of erection,stud out of the top level structure factors such as height,steel tube wall thickness,steel pipe diameter and stiffness of stable bearing capacity,the influence of parametric modeling and risk analysis for support system for the theoretical basis.(3)Taking the height of the sweeping bar,the step distance,the length of the vertical bar beyond the horizontal bar of the top floor,the thickness of the steel pipe wall and the stiffness of the joints as sensitivity factors,the buckling capacity of the ta ll template support under different combination conditions was calculated,and the response surface method was used to fit the buckling capacity of the template support to determine the probabilistic model of the resistance of the support.At the same time,the load probability model for reliability analysis was obtained based on relevant data,and the equation of state of the template support was established.The reliability of the support was calculated by monte carlo method.