Study on Mechanical Property of Plug-pin Steel Tube Scaffold Platform
|School||Dalian University of Technology|
|Course||Design and manufacture of ships and marine structures|
|Keywords||Plug-pin steel tube scaffold Strength check Finite element analysis Ultimate bearing capacity Eigenvalue buckling analysis|
This article studies the plug-pin steel tube scaffold platform, which is designed by MARCEGAGLIA, an Italian company. It is a comparatively complex structure consists of rigid frame and truss, which is installed within the cabin of liquefied natural gas (LNG) ship, providing space for staff to work on it. This kind of scaffold has strong bearing capacity, and is convenient to assemble and disassemble. It is safe and reliable and becoming increasingly widely used in shipbuilding, especially in the field of building the inner cabin. In order to better use and develop this new kind of scaffold, the constructor Dalian shipyard acquires the laboratory of shipbuilding technology of Dalian university of technology to process strength check and mechanical properties of the structure.Firstly this paper introduces the forms and characteristics of fasten-style, frame-style, and Disc-type steel scaffolding, which leads to the structure characteristics of plug-pin steel tube scaffold. And then the stress distribution of construction and installation platform is typically introduced.Secondly, since there are structural similarities between plug-pin steel tube scaffold and other types of the scaffold, this article widely uses the existing research methods and results of the other types of scaffold for reference. Methods and theories of ultimate bearing capacity and buckling analysis are also expounded.And then choose the plug-pin steel tube scaffold of double-row six-pitch three-span, use the finite element method to process its plug-pin node and rigid node, get four buckling modes and make analysis and comparison of them. Then do eigenvalue buckling analysis to this scaffolding under different type of connections and different transversal and longitudinal spans, obtaining ultimate bearing capacity of the whole-scale scaffold and its buckling mode. Finally the results and the ultimate bearing capacity of the fastened-style scaffold is compared, and the conclusion is drawn that the ultimate bearing capacity of this type of scaffold is better than fastened-style scaffold. These conclusions are beneficial to understanding the working performance of plug-pin steel tube scaffold and of reference value in guiding engineering practice.