A Study On The Base Isolation And Energy Dissipating Of Vertical Storage Steel Tanks With Flexibility Bottom

The cylindrical liquid-storage steel containers are widely used in oil fields. Earthquake is a natural disaster with outburst and ruinousness in the world. The damage of the vertical storage steel tank by earthquake is easy to make serious economic loss. Because most of the vertical storage steel tanks are flammable and exploded-prone medium, the consequence must be very serious. And the effect of the secondary damage must be worse by threatening the survival environment and national economy.Storage tank is basic facility of petroleum and chemical industry, and important facility of the employment of the energy sources, reproduction and supply. In recent decades, with the developing and exploiting of oilfields, and increasing of the demands of the reserving and conveying of energy facilities, the vertical storage steel tank is becoming huger and elevated, and its requirement is larger.With the exploiting of petroleum and natural gas, vertical elevated storage steel tank has become the important facility of petroleum and chemical field. How to reduce of the damage of the earthquake to it and adapt it to the uneven subside of the base has turned into one of the most important studies in this field. And the development of structure control provides a new direction for the seismic design and research. Combining with good adaptability to subside and deformation of flexibility material and thought of structure control, slip base isolation of vertical storage steel tank and the change of structure shape of tank bottom are experienced and studied in the paper. The major studies are shown as follows:(1)Aiming to flexibility material bottom of the tank and new structure, base isolation form with the characteristic of base isolation and energy dissipating is putting forward; the mechanism of slip base isolation is analyzed.(2)The calculate analysis model of the Flexibility material bottom of the vertical storage tank and move equation are founded; the method that Nonlinearity damp is simplified into equivalent linearity damp is given.(3)Aiming to 10 types of vertical floating storage tanks,by adopting slip base isolation system of flexibility material bottom of the tanks, simulate calculating analysis is carried out under the different seismic acceleration peak value, different sites,different ratio between diameter and height and different base isolation Period.(4)Simulate the dynamic experiment of flexibility material bottom of the vertical storage tanks is performed; the effect of slip base isolation system is studied.