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Over the past ten years , the application of steel tube structure in China's construction industry more and more widespread , rapid development , the range of applications involving almost all structural areas , including pipe truss structure by its unique structural advantages and good visual effects people of all ages . Ultimate bearing capacity of the pipe truss structure analysis , is one of the key technologies of tube truss structure design . Various factors affect the ultimate bearing capacity of pipe truss structure is random , conventional design methods can not consider the impact on the structure of a variety of uncertainties , with building structure stochastic finite element theory and statistical information , there is an urgent need tube truss structure design to introduce the concept of random defects modal method to ensure the ultimate bearing capacity of the structure to the probability of the point . Based on a project the same 48 - bay tube truss structure tracking detector nearly measured defect data ( material yield strength steel pipe wall thickness , pipe diameter , mid-span height , camber height deviation ) , the use of the probability statistical theory and method excluding abnormal data , randomly distributed defects of the structure and parameters of statistical information . On this basis , the use of stochastic finite element theory , by means of the analysis software , explore the structure of the force structure in roofing constant loads consider defects affect mechanism , and to compare and analyze the structure measured deformation values ??, indicating that the resulting defects random distribution and parameter information credible and defect structure . Based on the conditions of use of the structure , the ultimate bearing capacity of the structure of the structural system reliability sensitivity analysis , and geometry , material defects sort acuity ultimate bearing capacity of pipe truss structure to identify structural limit bearing capacity is most sensitive to the geometry , material defects , the the draw chord wall thickness of the ultimate bearing capacity of the pipe truss structure .
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