Finite Element Analysis Of Large-scale LNG Tank Under The Cases Of Static And Dynamic Load

In recent years, with the support of foreign technology, many large-scale full containment storage tanks of LNG were built in various parts of China. Meanwhile, with the joint efforts of researchers and the persons engaged in construction of the tanks, domestic large-scale LNG storage tank in this field of construction and design technology have made great progress, but there are still so many technical problems not being solved in many ways that localization of LNG storage tanks is not realized completely, so more concern and technical research and analysis are required.In this paper, the large-scale outer tank of prestressed reinforced concrete is as the object of research, the main work is as follows:Firstly, the ANSYS finite element software was used, the 3D finite element model of large volume of 160 000 m3 LNG storage tank of outer wall was established.Secondly, based on domestic/international load standards and the data of engineering experiences, the value of the various loads were determined. At the same time, the limit state design method proposed in relevant codes was adopted, the action or action effect combination formula under the normal and accidental action conditions were given, and the combination coefficients and the partial factor values of the variable load were listed clearly. Thirdly, the outer tank in different cases was caculated and analysed through the finite element software. Under the cases of the various action or action effect combination, the internal forces (axis force, shear force, bending moment) of the horizontal sections and vertical cross-section of the outer tank along the height variation were got, and the results were analyzed.Through the calculation of using ANSYS software and the analysis of results, some conclusions can be drawn. In various cases, the top and bottom of the tank suffer the maximum of the forces, and the tensile stress exceeds the tensile strength of concrete design value, with corresponding parts are cracking in working condition; In action or action effect combination, the European codes can be applied to the load combinations and load effect combination, but the Chinese codes only can be applied to action effect combination, the calculation result of Chinese codes is more safety than the European codes; Just considering European codes, case 2 and case 4 in the design conditions dominate, at that case, the most negative forces in the outer tank can be generated.