The Numerical Analysis Of Stress And Buckling For Wiggins Gasholder

With the development of industry, Wiggins is commonly used in gas storage in our country, especially mid-high pressure gasholder took important role in market and had a promising future. At present, Due to the shortage of the perfect design codes, designers often use simplified calculation method, which make the design of Waiggins has many aspects to improve .Therefore, how to build a perfect model and analyze the stress principle is a urgent question to solve.At the beginning of this paper, the ANSYS software of finite element is used to model Wiggins with APDL and calculate the deformation and the stress under different load cases. Depending on the result of analysis, the perfect design can be made. In order to get the frequency and mode, the mode is analyzed. According to the frequency, the deformation and stress under wind can be calculated precisely. The result shows gas pressure is a most disadvantageous load for cylinder and wind is a most disadvantageous load for spheric shell at top of structure. The most equivalent effective stress under the most disadvantageous load appear the connection of cylinder and top, but the most stress is far smaller than yield stress of steel. In conclusion stress of static calculation is not a decisive collapse factor of structure.Secondly, the buckling of cylinder and piston is analyzed. By changing the thickness of cylinder wall, the cross-section and lay-out of the longitudinal ribbed stiffener and the cross-section and spacing, the most effective element of bulking of structure is found out. The findings provide a firm basis on optimization of the structure. At the same time, the characteristic number buckling analysis and nonlinear buckling analysis is undertaken. Under different angle lean-state, the effect of the different initial drawback of piston for buckling bearing capacity is studied. It shows that when the nonlinear is taken into account, buckling bearing capacity is less than the characteristic number. Under different angle lean-state, the initial drawback makes a marked effect on buckling bearing capacity of piston. The collusion shows that the bulking is a final element.