Study On The Optimization Design Of The Internal Support System Of Assembled H-beam Truss

With the rapid development of urbanization,the continuous increase in building height has led to an increase in the buried depth of the building foundation and an increase in support costs.The optimization of internal support design research is also becoming more and more important.Among the existing supporting structures,due to the advantages of economy,green and environmental protection,the internal support of the steel structure gradually moves onto the stage of the deep foundation pit.A prefabricated H-shaped steel truss internal support truss system supports The application in nursing is becoming more and more extensive.ABAQUS finite element software provides an excellent analysis platform,but due to its wide applicability,it does not provide suitable foundation pit design modules and tools,and traditional modeling will consume too much time and effort.This paper uses Python language for foundation pit design to create a plane area geometric division algorithm suitable for the horizontal support arrangement of the H-shaped steel truss internal support truss system.Based on it,the Python language has completed the secondary development of ABAQUS pre-processing,and combined with ISIGHT optimization software Optimize the design of the internal supporting truss system model of the H-shaped steel truss.The main work of this paper is as follows:(1)Systematically organize the layout rules of the supporting truss system in the H-shaped steel truss into a plane area geometric division algorithm,by inputting the corner coordinates of the foundation pit boundary,the known column point coordinates,the number of diagonal braces,and the diagonal braces.Layout spacing,right-angled side length and other parameters to complete the horizontal support plan;input the height of the column to complete the vertical support layout.The horizontal support and the vertical support are assembled to complete the parametric geometric modeling of the H-shaped steel truss internal support truss system model.In the process of geometric modeling,different definitions of component types are used to give different component material properties and section parameters.(2)The establishment of the H-shaped steel truss internal supporting truss system model can be automatically completed by inputting the geometric parameters of the foundation pit.At the same time,the strength and displacement of the H-shaped steel truss system under conservative loads are analyzed based on the ABAQUS software,which verifies the H-shaped steel truss system design program developed in this paper.The model can be established quickly and effectively,and a more ideal result can be obtained.(3)Combining the optimization software ISIGHT,taking the total cost as the goal,taking the strength,stability,deflection,and purlin displacement of the components as constraints,the multi-island genetic algorithm is used to optimize the cross-section parameters of the components,and the internal support of the H-shaped steel truss is optimized.The cost of the system was reduced by 16.2% compared to the original.From the optimization results of the design variables,it can be seen that both the diagonal bracing system and the opposite bracing system are suitable for the selection of wide flange H-shaped steel,and the diagonal web bar can choose the wide-flange H-shaped steel with smaller cross-section.In short,combining a script program and ISIGHT optimization process for the H-shaped steel truss internal support truss system proposed in this paper can quickly and effectively obtain the ideal model.