Mechanical Analysis Of Pull-sheet Aluminum Formwork Systems And Design Study

In the development of "green,low-carbon and high-efficiency" new building materials,the use of pull-sheet aluminum formwork systems has become increasingly widespread in the construction of concrete high-rise buildings.The domestic market demand for this technology is also on the rise.However,due to differences in mechanical properties between the aluminum formwork and traditional formwork systems,and a lack of standardized design and construction specifications,the use of aluminum formwork remains limited in many areas of China.Therefore,mechanical analysis and design research of aluminum formwork systems are crucial for greater expansion.This paper aims to analyze and study the mechanical properties and optimal design of wall and floor formwork using pull-sheet aluminum formwork systems as the primary research object.By utilizing a combination of theory,field tests,and numerical simulations,this paper examines the following research topics:(1)Taking a high-rise formwork project in Xi ’an as the background,the theoretical calculation of the wall formwork and floor formwork of the pull-type aluminum formwork system is carried out.The calculation results show that the stress value and deflection value of the two formworks meet the requirements of the specification ’ Technical specification for aluminum alloy formwork of building engineering ’(DB 61 / T 5041-2022).The field test of the concrete pouring process of the pull-type aluminum formwork system was carried out,and the variation law of the mechanical performance of the pull-type aluminum formwork system was obtained.Through the on-site monitoring and analysis of the panel,transverse rib,longitudinal rib and pull-out position,the safety of the pull-out aluminum formwork used in the project is verified,but there is still a large optimization space in terms of material utilization rate,and the wall formwork and floor formwork can be further optimized.(2)MIDAS GEN was used to simulate the aluminum formwork system.By comparing the theoretical calculation,experimental data and finite element analysis,it shows that the maximum stress and maximum deformation of the panel,transverse rib,longitudinal rib and tab are consistent.The maximum stress and maximum displacement of the wall template appear in the pull-sheet;the maximum stress value of the floor formwork appears in the middle of the longitudinal and transverse ribs,and the maximum deformation appears in the middle of the panel.The error between the test data and the finite element analysis results of the same part is small,which verifies the reliability of the finite element analysis.However,the strength and stiffness of the wall and floor formwork show significant surplus capacity,pointing to the possibilities of further optimization.(3)Based on the above research results,MIDAS GEN was utilized for modeling and analysis of the pull-sheet aluminum formwork systems in actual projects,where the stress-strain characteristics of pull-sheet aluminum formwork wall and floor formwork with different parameter designs were investigated.Results reveal that the maximum stress value of the optimized wall formwork was increased at the actual construction load when compared with the original formwork,rising to 79.01% of the design strength value of aluminum,and the deformation value has increased,rising to 65.33% of the deformation limit.Moreover,the material consumption of aluminum alloy formwork was reduced by about 10.95%.The optimized floor formwork improved compared to the maximum stress value of the original formwork,rising to 38.59% of the design strength value of aluminum,and the deformation limit increased to 53.33%.Material consumption was reduced by 19.9%,resulting in significant material and labor cost savings.