RESEARCH ON A NEWLY DOUBLE-WALL STEEL INSULATION SILO WITH MULTIPLE BOLTED JOINTS:PART Ⅱ: EXPERIMENTAL VERIFICATION

摘要

In this paper, the model of a double-wall steel insulation silo with multiple bolted joints and the corresponding experiment plan are designed. The experiment for verification is carried out to get the experimental results such as lateral pressure, strain, displacement, ultimate bearing capacity, failure mode and so on. The experiment results and the finite element results are compared and analyzed, showing that the interactive property between the internal and the external silo wall of the newly steel insulation silo is outstanding. It should be noticed that the connection model of the internal and external silo walls has a significant impact on the structure performance of the newly steel insulation silo. The calculated results of A3, A4 and A5 are almost the same and satisfyingly consistent with the experiment results. The A3 model is recommended. The horizontal pressure from the storing is mainly undertaken by the internal plate under tension during the loading process. Before the loading reaching P_(u-int) (the maximum Mises stress of the internal plate reaching the ultimate strength), the vertical friction is undertaken by the combined force system formed by both the internal and the external plate. When the loading is around P_(u-int), the internal plate above the support and under the first external ring beam will show sudden elastic-plastic buckling under the vertical friction and horizontal pressure. After that, the external plate bears more and more vertical friction until the external plate at the same height shows elastic-plastic buckling. Finally, the model loses the bearing capacity.