Research On The Engineered Key Technology Of Post-Processing Based On Refined Finite Element Analysis

The paper makes a systematic research on the key technologies of finiteelement postprocessing, such as prediction of bridge collapse, internal forceanalysis of bridge collapse and dynamic display of bridge collapse.Firstly, the application of the component importance evaluation theorywas studied which was grounded on Generalized Rigidity Method, and itmainly included the following aspects:(1) Based on the solid element, theunit importance coefficient calculation formula was deduced.(2) By usingof C#and VS.net2005programming, the calculation of unit importancecoefficient and the development of display program were realized.(3) Thedistributions of importance coefficient of the two-span masonry arch bridgeand the cantilever beam structure were further studied, and then thecollapse of the two-span masonry arch bridge was predicted by adoptingthe program.Then the calculation method of the internal force of controlling sectionswhich can be used on bridge design and the analysis of bridge collapsingprocess was researched, and it included the following three aspects:(1) Thesubdivision algorithms of FEM model were proposed and the pros and consof calculation method like the Blocking Search and Adjacent ElementPriority algorithm were analyzed and compared.(2) Further research wasmade on the calculation method of the internal forces based on the stressdistribution and nodal force after obtaining stress or nodal force on the subdivision surface.(3) A novel system for calculating section forces wasdeveloped with VS.NET2005and C#, which was applied and verified inthe cantilever and masonry arch bridges respectively.Finally, the input algorithm of capacious file based on partitioning thefile was researched for the reason of the large number of the calculationresults. The Finite Element Post-Processing System of the bridge collapseanalysis was also improved.The results showed that:(1) By using the intersection algorithm ofadjacent element priority of blocking search, the calculation of the internalforce of controlling sections was faster and more accurate.(2) Thecalculation of the internal forces based on equivalent nodal force was moreefficiently and more widely applicable.(3) The failure modes of the twospan masonry arch bridge was revealed by the coefficient for importance ofthe masonry arch bridge.(4) The problem of memory overflow was solvedby using the input algorithm of capacious file based on partitioning the file.And the collapse process of the bridge was displayed at last.