Research On The Fasten Style Tubular Steel Scaffolds Tie Members In Super High-rise Building Construction

At present,our country entry into a period that the national economy develop in a high speed,infrastructure scale is unprecedented enpanding.The word teeming with high-rise,super high-rise buildings and all kinds of strctures,so we should demand more on construction technology and management.For the past few years,steel tubular scaffold with couplers is used more and more extensive because of its simple strctures,convenient disassembly,reasonable force transmission,high durability and other characteristic.Therefore,it becomes particularly important to explore its safety reliability.The tie member is the key element of steel tubular scaffold with couplers in building construction,it is not only related to the quality,the cost and the progress of the project,it is also closely related to the safety of the construction.In the construction of high rise building,because of the increase of the building height,its mechanical performance is becoming more and more complex,the significance of the research is particularly important.This dissertation design and research the mechanical performance,the quantity and arrangement of tie members and the ultimate bearing capacity of the tie member under scaffold floor in super high-rise building construction.Be different with ordinary high-rise buildings,the load on scaffold is more complicated,the horizontal wind load is significantly enhance,and the vertical wind load cannot be ignored in super high-rise building.This article summarize the computing method of the horizontal wind load and analyse the vertical wind load in uper high-rise building construction.Base on the analysis of wind load,the writer draw a conclusion that the mechanical performance of the tie member under scaffold floor,to do the groundwork for the following research.Based on talking about the super high-rise building construction horizontal wind load correction calculation theory,this dissertation design and research the quantity and arrangement of tie members.There use the stability calculation formula of the tie members to calculate the quantity of tie members of different height of super high-rise building.About the arrangement of tie members,this paper analyse and compared rectangle and diamond these two kinds of arrangement used the finite element analysis software Ansys.The connection of the couples between the elements used semi-rigid analytical method,so that the results is more close to the actual stress situation.The stress and displacement of the scaffold by tie member rectangle arrangement is more rational than by diamond arrangement.So,we should give priority diamond arrangement in the tie member design.To the tie member under scaffold floor,the writer calculate its horizontal and vertical force under different height,and do finite element analysis,make experiment to get the ultimate bearing capacity.Based on the heoretical arithmetic,the author make two groups experiment of 1.4m and 2.1m tie members.Then compared the test results with ANSYS analysis results to make the conclusion more persuasive.At last the writer get the moment transfer coefficient of semi rigid joints by theoretical calculation and finite element analysis.And then calculate the ultimate bearing capacity and the critical height of tie members with different length of super high-rise building construction in Shenyang.For example in Shenyang,this dissertation describes the design method of quantity,arrangement and ultimate bearing capacity of tie members in super high-rise building construction.The article probide evidence for scaffold tie member design in super high-rise building and supplement for spacing of tie member Code JGJ130-2012.