| The cantilevered structure of high-rise buildings usually uses cantilevered supporting scaffolding as the bearing platform.The cantilevered steel main beam is directly anchored to the main body of the building,and one end of the cantilever is fixed by bracing to form a stable triangular support.In recent years,high-rise buildings have continued to develop,and the proportion of cantilevered structures in engineering construction has increased year by year.Cantilevered scaffolding is widely used in the construction of cantilevered structures in high-rise buildings because of its good economy,structural rationality and engineering applicability..However,with the development of architectural design and users’ pursuit of architectural aesthetics,cantilever structures are widely used in high-rise buildings,and the length of the cantilever continues to grow,resulting in super-long cantilever support scaffolding,which increases construction costs and makes design difficult.Increase.The two-dimensional calculation model is not enough to reflect the real force situation of the structure,which greatly affects the reliability of the structure.Therefore,with a project in Chengdu as the engineering background,researches are carried out on the structure of cantilevered scaffolding,optimization of structural internal force,structural calculation and design,etc.The main work and results of this paper are as follows:(1)The problems of difficulty in erection and dismantling of overhanging scaffolding and large consumables have been solved.Starting from the actual engineering,the focus is on the analysis of the difficult problems in the design and construction of the cantilever scaffolding.According to the cause of the problem and the site conditions,a telescopic lower brace was designed to solve the problem of difficult disassembly and assembly of the cantilever scaffolding during construction and large consumables.And use this as a model to carry out a model test to verify the reliability of the retractable lower strut.(2)A model test was carried out,and the control test of the position change of the supporting point was completed by using the telescopic lower strut.Based on the similarity theory,a 1:10 similarity model test was established,and the position of the support point was used as a variable to conduct a control test.Through comparative analysis,it is found that the internal force of the under-support cantilever support scaffold is closely related to the position of the supporting point.A reasonable design of the supporting point position will make the structure more safe and reliable.(3)The finite element model of the under-support cantilever support scaffold was established.Through combing and summarizing the calculation methods of cantilever scaffolding,and theoretical research on scaffold structure at home and abroad,the boundary conditions of the structure model are determined,and based on the experimental model data,a finite element calculation model of the under-support cantilever supporting scaffold is established.The finite element results are compared with the experimental data to verify the reliability of the model.Through analysis,it is found that the stress and displacement of the cantilever I-beam and the axial force of the lower strut have minimum values ??during the change of the position of the support point.(4)Developed the calculation program for the under-support cantilever support scaffold.Through the python high-level programming language and its library,based on the ANSYS large-scale commercial finite element software for secondary development,a set of simple,efficient and easy-to-operate calculation programs have been obtained.It can quickly complete the modeling and calculation of the under-support cantilever support scaffold,and the built-in batch processing function can extract the change of the internal force of the structure when the support point changes,and assist the designer in rationally optimizing the structure model. |
PDF Full Text Request