Safety evaluation of 20 000 m3 composite floating roof under rain and snow loads
Excessive rain and snow loads often lead to large deformation of the composite floating roof,affecting the safety op-eration of the external floating roof tank.To study the mechanical response and safety of the composite floating roof under rain and snow loads,a finite element model of the composite floating roof was developed,considering the effects of geometry,ma-terial and boundary conditions together.Numerical analyses were performed to obtain parameters such as the sinking dis-placement,the shear strength,the yield strength,and the maximum strain under various rain and snow loads.The safety of the floating roof was then evaluated based on these results.The results show that under rain and snow loads,the floating roof tends to take a"concave"shape.As the load increases,the floating roof sinks as a whole,especially after sliding at the floating roof boundary.Non-uniform loads significantly affect the deformation and forces experienced by the floating roof.For a snow load of 0.9 kN/m2 uniformly distributed on one side of the floating roof,there is a risk of"chucking".The Mises stress and strain safety coefficients of the floating roof structure remain within a reasonable range,indicating that the compos-ite floating roof is not damaged due to strength and stiffness under rain and snow loads.
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