Buckling Behavior And Experimental Research Of Floating Roof Tanks Subjected To Settlement And Wind Load

The hundred thousand cubic meter floating roof tanks are widely adopted in petroleum and chemical industry, which are mainly used for the storage of oil and other chemical products. Due to the large volume of the tank and most of them are usually located on the soft soils, large differential settlement can be monitored beneath the tank walls. At the same time, the tank located prone coastal areas are highly vulnerable to the hurricane. When the differential settlement reaches a critical value or the tank wall suffered wind load reaches a certain value, it can easily cause the tank shell occur buckling phenomenon. In this paper, the differential settlement is treated as two forms, the one is the inclined plane sedimentation at the bottom of the tank and the other is the form of harmonic settlement. Based on the two forms, the numerical calculations and experiment analysis are taken to investigate the buckling behavior. While researching the floating roof tank with the same structure as the actual tank of wind ring beams buckling analysis under wind load. Finally by designing a tank settling experimental apparatus verify the reliability of the numerical calculations. Main work conducted is as follows:(1) Currently, researches on harmonic settlement are more than the inclined plane sedimentation. Based on the inclined plane sedimentation applied to the tank bottom, analyzed the tank wall stress and deformation finally get the ultimate settlement value. By comparison with the specification found that the settlement value is too conservative. Finite element analysis in the tank under the tank bottom plane inclined settlement can withstand a larger settlement than the specification value.(2) Analysis of the tank wall buckling behavior under different harmonic numbers. Compare the edging angle and the hydraulic pressure on the influence of the tank wall buckling behavior under the harmonic settlement. The results show that buckling behavior is different under different wave numbers, and the settlement values are different too.(3) Comparative analysis of hundred thousand cubic meter floating roof tank’s buckling modes through wind load, the different is whether there has tank ring beams. Obtained that in different situations the tank can withstand the extreme wind load value and given the dangerous position when the tank wall occur buckling behavior. Through the analysis give some reasonable suggestions to the tank.(4)Through building an experimental apparatus to research the tank wall mechanical properties under the harmonic settlement. The experiment measured the stress distribution on the tank wall and the radial deformation. Getting to know the material properties of the tank before elastic limit and enter the plastic stage. Finally, comparing the result of numerical analysis and experimental research, verify the reliability of numerical analysis.