Experimental Research On Seismic Response Of Prestressed Concrete Outer Wall Of LNG Storage Tank

As the economy booms quickly in China,the demand of energy grows increasingly,at the same time,the government is inclined to use the clean energy in the policy.So the LNG caters to the popular require in the aspects of a high calorific content,non-population,efficient storage and transportation,high safety factor,and other advantages.With so many merits,the LNG will become the staple energy instead of petroleum and coal in the future.Since China has imported LNG,it has constructed a clump of LNG terminals along the coast of China to support the growing demand of energy.The LNG storage tank ─ domain structure in the LNG terminal,should enjoy better anti-seismic performance.Currently,China has not the relative codes of LNG storage tank design and anti-seismic,therefore,we should pay more attention to the anti-seismic performance of LNG storage tank.The main context of the master dissertation:1.Taking the prestressed concrete outer Wall of a certain above-ground full containment LNG storage tank with a volume of 50,000 cubic meters as the prototype,considering the fluid-structure coupling interaction between the concrete outer wall wall and the liquid,a shaking table test model of the concrete outer wall of LNG storage tank with a length ratio of 1:50 was designed according to the similarity theory;2.Completing the shaking table test,emphatically from the acceleration,displacement and strain of three factors of seismic response of the concrete outer wall is studied,some useful conclusions are: under the three conditions of empty,half leakage and complete leakage,as the wall height increases,the acceleration grows larger,confirming the fact that the acceleration magnification factors have nothing to do with the earthquake intensity;the displacement first increases and then decreases along the outer wall height;Both the annular strain and the vertical strain increase along the height of the outer wall,and the variation range of the annular strain along the height is larger than that of the vertical strain,consequently,it is suggested to increase the amount of circumferential prestressed reinforcement.3.Finite element software ABAQUS was used to establish the finite element model of prestressed concrete outer wall of LNG storage tank,in which the fluid-structure coupling effect of prestressed concrete outer wall and liquid was simulated by the coupled Eulerian-Lagrangian(CEL)technology.The static analysis of prestressed concrete outer wall of LNG storage tank is carried out.4.Exerting a one-directional earthquake effect on the prestressed concrete outer wall model of LNG storage tank by using the time history analysis;The seismic response of prestressed concrete outer wall was analyzed from three factors: displacement,hoop stress and axial stress.The outcome demonstrates: the stress is larger at the height of 0,1/4,1/2 and 3/4 of the tank wall.It is suggested that the design of LNG storage tank should be mainly considered in the above locations.