Influence Analysis Of Fastener Style Steel Pipe Scaffolding Structure Based On Measured Imperfection

Decades of reform and opening up, the steel scaffolding structure is more and morewidely in China’s construction industry applications, has been a very rapid development,increasing range of applications, steel tubular scaffold structure is its unique structuraladvantage bypeople of all ages. The security of the actual project has been more and moreattention.Steel tubular scaffold is a truss structure used is sensitive to defect structure and system,and structure steel pole is a long-term repeated use, there is the cumulative effect of wallthickness of wear and tear, the initial bending of the specification provided, but after repeateduse of realistic pipe defects measured and statistical analysis have not been reported. Not yetformed a unified defect analysis theory and methods, the use of safety to ensure that the steeltubular scaffold structure to carry out the observed defects in the structure and properties ofthe impact study has important theoretical significance and value in engineering.According to the random sampling method, the measured pipe used in nine of the fiveprojects in construction fastener Scaffolding works, random sampling tests6m and3mφ48×3.5specifications748pipe wall thickness, diameter, initial bending of the original data in thefield, the use of mathematical statistics and probability theory, eliminate outliers, the initialdefects were randomly distributed and probability function parameters in the statisticalinformation. On this basis, the method based on finite element analysis, by means of ANSYSsoftware, the use of a consistent defect mode and the modal method of random defects,different fastener tightening torque (30N·m，40N·m，50N·m) initial geometric imperfections3L/1000rod defects measured as a parameter to explore and analysis of the mechanicalproperties of steel tubular scaffold and the ultimate bearing capacity. Studies have shown thatthe rod cross-section margin of error distribution is not random, wall thickness, diameter andthe beginning of bar bending defects on the structure can not be ignored.