Nonlinear Stability And Ultimate Bearing Capacity Analysis Of Flue Structure

Being an important access for smoke emission, a smoke flue normally shallbe a large scale thin rectangle shell steel structure composed of thin steel platesand stiffening bars, with interior supporting poles, characterized with a big sectionarea and thin wall plates. Furthermore, the flue often works under a complicatedcondition, so it is theoretically and practicably important for us to study theinfluence brought to overall safety and economical efficiency of a flue by thestability and bearing ability of the flue and its important components.This paper is based on the named Yuhuan power plant. Under a complicatedloading condition, it is difficult to acquire the maximum load and yielding modeaccurately through traditional analytic methods. So, the numerical method is usedfor the relevant study in this paper.In this paper, the stress and deformation of the flue, and the weakest part ofthe structure are all acquired firstly through overall calculation under thedangerous static loading condition, which is the basis for further analysis andrestriction condition for stability analysis.Stiffened plate is an important component of the flue structure, subject tojoint action of uniform pressure and internal plane forces, it is prone to bucklinginstability or the intensity destruction. Primarily, make analysis of the variousfactors that would affect the stability of stiffened plate, and seek the best stiffnessratio to make the most stable in the stiffening plate. Then, extract two models ofstiffened plate for ultimate strength analysis, the smaller value of its strength andstability of destruction is the ultimate bearing capacity of the model. Finally, thestability of hole stiffened panels were analyzed to study how the hole rate affectthe stability of stiffened plates.Based on the results of overall static analysis, no.4component where bigdeformation and stress emerged is chosen for further stability analysis. Primarily,analyze the Eigenvalue buckling and obtained typical Eigenvalue yielding mode.Then compare the stress and deformation directly through linear and nonlinearcalculation.Finally consider the material elastic-plastic and nonlinear deformationof the flue structure to carry out the analysis of ultimate bearing capacity of the flue and prove that the flue is safe under the maximum pressure, and its carryingcapacity with a large amount of surplus.As there is no fully applicable norm for the design of the flue currently, thestudy of this paper is instructive for structural design and optimization of the flue.