Analysis And Design Of Petrochemical Steel Structure Installed Viscous Damper

China is an earthquake-prone country that many refineries of petrochemical enterprise locate in earthquake regions where the fortification intensity are seven or more than seven degrees. Petrochemical structural damage caused by the earthquake will not only result in a great direct economic loss, but also trigger secondary disasters, for instance fires, explosions, water pollution and so on. In order to mitigate earthquake damage, steel structures are adopted in refineries. But previous earthquake damage showed that violent earthquake still caused a certain damage to the petrochemical steel structure, the indirect losses were about 10 times or even higher of the direct losses. With the development of the petroleum industry, mitigating the earthquake disaster of petrochemical steel structures has become an important research subject. The existing seismic design is essentially the idea of" anti hard" resistance, although, in the small earthquakes and earthquake cases to ensure the safety of the structure, but, under major earthquakes are difficult to ensure the safety of petrochemical equipment and instruments in the structure. Damping energy consumption belongs to an effective method in the field of structural control. Earthquake energy is dissipated by setting the dampers, and the steel structure of main body damage can be reduced by it. In this paper, research on energy dissipation design of petrochemical steel structure with viscous damper was engaged in the main contents and achievements as follows:1. Current seismic design methods of petrochemical steel structure were summarized, and the necessary of energy dissipation device introduced in petrochemical steel structure was discussed.2. Considering the steel framework of a large refinery reformer reactor as the study case, numerical models of the steel structure were set up based on the general-purpose finite element software SAP2000. Influences of the viscous dampers connection, installation location, quantity and mechanical parameters to energy dissipation performance were studied. The research results indicated:(1) Energy dissipation effect of herringbone connection was superior to the other two connections; (2) Viscous dampers should be evenly arranged vertically along the structure, and the arrange could also be adjusted according to the production process; (3) The shear and displacement angle of the floor that viscous dampers arranged decreased with the amount of viscous dampers increasing, but when the damper after reaching a certain number, it not by much; (4) Energy dissipation effect of the changes of coefficient of the damper is more significant than the changes of the speed index. Large coefficient and low speed index viscous dampers should be used in energy dissipation design as far as possible.3. Based on the above research proposed equipped with viscous dampers of petrochemical steel structure Shock-absorption design method, and to a refinery catalytic gasoline refining regenerator affiliated steel frame for example, tried to design and analysis, to verify the feasibility of the Shock-absorption design method is presented in this paper.