Research On Mechanical Properties Of LNG Tank Shell Under Wind And Seismic Excitation

Liquefied Natural Gas (hereinafter referred to as LNG) has the features of convenient transport and storage, safety use. In the past few decades, the world LNG consumption has a substantial increase, all countries put LNG as a clean fuel with low emissions to promote them. LNG tank is the important equipment in storage, use of LNG tank.There has been a lot of research results abroad and many of them have been applied to engineering practice, but lack of wind and seismic studies for the LNG tank. Structural designers also have an urgent need for internal force and deformation law of LNG tanks under a variety of dynamic loads.Therefore, shoud have an in-depth study of LNG tank resist wind and seismic.This study focused on vibration characteristics, wind-induced buckling and seismic response analysis about two kinds of LNG tanks. The main contents include:1. Verfication for element model of LNG tankUsing finite element software ANSYS creat finite element model, in which shell63, shell91 element models provided by ANSYS cell libraries were used to creat concrete LNG tank and sandwich LNG tank model. Verifing its legitimacy through the vibration characteristics of the model, based on the results of Solid45 finite element model provided by ANSYS.2. The vibration characteristics of LNG tankCreating the whole tank, half tank, 1 / 4 tank model of empty state of two types of LNG tanks, first sixth orders of natural frequency and vibration mode are obtained through mode analysis for finite element model.Analysis the similarities and differences of two simplified finite element model with the whole tank model.3. Wind-induced buckling analysis of LNG tankComparison of several circumferential and vertical wind pressure distribution of cylindrical structures abroad to propose suitable form of wind pressure distribution for this article, and put this wind pressure in the form of surface loads applied to the storage tank, to get critical buckling velocity of this two kinds LNG tank.4. Seismic response analysis of LNG tankAccording to requirements of Chinese "code of building seismic design", analyze this two kinds of tanks of unidirectional level seismic response analysis under the action of selected three kinds of seismic waves, recording the time-history curve for special points of LNG tank. Obtaining LNG tank's displacement, acceleration, stress distribution law under the action of selected three kinds of seismic waves.