Seismic Vibration Control On Reinforced Concrete Structure With Multiple Tuned Mass Damper Considering SSI Effects

In this thesis,the vibration control on a fifteen-story reinforced concrete structure induced by earthquake is analyzed by using software sap2000.In order to consider the effect of soil to the structure(SSI),two types simulation models are built.One is a model without considering the soil(called fixed base model),the other one is a model considering the soil(called flexible base model).The parameters of the MTMD have been optimized including the damping ratio,mass ratio,stiffness of damper,mass of damper and the operating procedures are proposed for designing MTMD.Two earthquakes(ElCentro and Hollister Hall city)and different soil types(soft and hard soil)are considered in the analysis.In addition,the natural periods,joint displacements and base shear of the structure are compared in different models.It is observed that the natural periods and the joint displacements will increase when the soil-structure interaction effect is considered by comparing the fixed base model with the flexible base model.It is obtained that the optimally designed MTMD system in fixed base model is more effective for vibration control than in the flexible base model,which means that the SSI needs to be considered when the parameters of MTMD are designed.Further,the damping in the main system significantly influences the optimum parameters and the effectiveness of the MTMD system.The analysis of this structure yielded better results under Hollister Hall city than El-Centro with fixed base than flexible base.