Research On Application Of Vibration Control Technoloy In Main Buildings Of Thermal Power Station

Main buildings of thermal power stations are important lifeline engineering, andimproving the seismic performance is of great importance. Main factory buildings arealways used with reinforced concrete frame structure, and the structure arrangement iscomplex and irregular because of the production process requirement, whiche makesthe seismic performance poor. Passive energy dissipation damping technologies havebeen promoted in the civil and public buildings, while these technologies have’t beengot good use of in factory buildings due to their limited space. As a starting point, thispaper studies three seismic mitigation methods,such as the distributed damping, kneebrace type dampers and supporting type coal hopper in order to solve the problem ofindustrial space restrictions. This paper mainly adopts the method of numericalsimulation based on general finite element software ABAQUS platform, consideringthe complexity of earthquake ground motion, a large amount of ground accelerationrecords are used for statistical analysis of the structure under small or middleearthquake action. With ABAQUS software simulation in structure vibration controlability being not enough strong, the nonlinear viscous damper unit is developed.In thispaper, the main contents as following:1. Based on general finite element software ABAQUS, nonlinear viscous damperis developed as FORTRAN subroutines respectively from the user materials and unit.Contrasting to the earthquake response of the different speed index of viscousdampers in SAP2000can verify the user subroutine.As result, it has higher calculationaccuracy.2. Energy dissipation components such as low yield point steel, friction sleeverod or small damper could be inserted in the reinforced concrete frames, not taking upstructure space, which is called distributed damping. This article firstly analyzes theadditional equivalent damping ratio of individual component (beam, column, shearwall) containing damping steels, finding that low yield point steels could yield prior tothe frame and produce energy dissipation in advance. Then through the three layerBechmark model and elastic-plastic analysis of engineering example, low yield pointsteels is suggested that it can increase the frame damping in component level, reduceframes damage and improve structural seismic performance. In addition, distributedfriction sleeve rod and damper also can achieve similar damping effect as low yield point steels. what’s more, distributed friction sleeve rod has more advantages.3. Dampers is arranged in the vicinity of beam-column joints, as knee brace typedamping, which has little impact on structural space. It makes use of relativedeformation between beams and columns to dissipate energy. Through theoreticalanalysis of the single layer and single span plane frame and on the base of numericalsimulation of structure control benchmark model with knee-brace type dampers, thispaper shows that knee-brace type damping scheme is feasible in technology anddamping effect, similar to slant bracings, can be obtained through reasonable design.On the other hand, seismic response of knee brace type damping on the projectexample with viscous dampers and lead dampers is examined, indicating that dampingeffect of viscous dampers is better under the action of middel earthquake, and leaddampers is preferred under the action of large earthquake.4. Supporting type coal hopper relaxs the traditional fixed point between coalhopper and its supporting structure, being replaced by isolation rubber mat, and drivesenergy dissipation dampers through the horizontal displacement of rubber mat. It hasthe effect of seismic isolation, passive energy dissipation and quality FM. Firstly, thispaper analyzes the impact of seismic and structural frequency ratio, structural and coalhopper frequency ratio, coal hopper and structural quality ratio, structure dampingratio and coal hopper damping ratio on the structural damping effect through thetheoretical analysis and based on the engineering example, coal hopper quality change,the system damping ratio and the structural period alteration are carried on furtheranalysis and research, concluding that damping effect is better when coal hopperperiod is1.5~2.5times as much as elastic structure, and the damping ratio of0.7canreach more than20%damping effect. With reasonable design, supporting type coalhopper can have obvious damping effect.