Experimental And Theoretical Study Of Mechanical Properties Of Fastener Steel Tube Full-hall Formwork Scaffold Under Different Exection Plans

The fastener steel tube full-hall formwork scaffold has played an important role as supporting the frame body in modern construction activities.With the development of modern domestic urbanization process, the fastener scaffold plays an irreplaceeable role in bridge construction,reinforcement of mines and concrete pouring. At the same time,more and more construction engineerings are supported by the fastener type steel tube full-hall formwork scaffold, some engineering accidents were caused by shortage of fastener, steel tube bengding and lacking of calculation, the number of accidents have increased year by year.At present,the domestic study of the fastener steel tube full-hall formwork scaffold is relatively few, more scholars pay more attention to the double pole steel tubular scaffolding with couplers around the outside of the building and frame steel tube scaffold, their calculation theories and methods for studying the fastener steel tube full-hall formwork scaffold have a certain referable value, but this kind of calculation methods did not take the integrity of frame body into consideration, have a certain limitation.This paper mainly studies the mechanical properties of the fastener type steel pipe scaffold, study the variable rules of fastener scaffold of stress and displacement by using the method of load test and field monitoring, compared with the stress variation in the theoretical model. learning one upright tube’s stress transfer variation under different conditions of bracing, lift heights and bottom reinforcing tubes. Researching the frame buckling characteristics of destruction according to the stress and displacements to provide the corresponding references for the development of remote warning monitoring system.In this paper, the main work includes:(1) learn the influence of mechanical properties across 3 x 3 the frame body test by changing the sizes of lift heights, braces and bottom reinforcing tubes.(2) Establish the MADIS/GEN analysis model of finite element method, research the stress transfer laws of upright tube and the influence of horizontal displacement under the frame body.(3) Study the characteristics of instability before failure of the frame body to provide the corresponding guidance for the development of remote warning system.(4) complay the theoretical model with the test model, analyze the causes of differences, and put forward some suggestions for the improvement of the model.Sorting datas of the model of the testing and the theory, get the mechanical variable properties of fastener steel tube full-hall formwork scaffold through analysing under the theoretical model and the test model, learn its horizontal displacement under the per level load characteristics of variability. Finally, study the stress variation and displacement of each measuring point before the frame body damage. Make a progress of developing an early warning and remote monitoring system and for the next step to make the key position to provide the corresponding theory and reference.