This study focus on Perimeter Concrete Wall Dampers (PCWD). PCWD can achieve required large mass ratio without additional mass. This system also can control multimode vibration. Suitable location for the installation of PCWD and their tuning frequencies are selected based on modal parameters of the uncontrolled structure respectively. In addition to the numerical simulation, an eleven story is modeled using SAP2000. The proposed system is greatly reducing seismic response of main structure.

In here, a Modified Diagrid Structural System (MDSS) has been proposed to compare with diagrid structural system, Regular Frame with Optimized Single Tuned Mass Damper (RFwOSTMD) system and Regular Frame without Optimized Single Tuned Mass Damper (RFwoOSTMD) system. To this aim, a rectangular reinforced cement concrete (R.C.C) building and a diagrid R.C.C multi-storey building were considered, and analyzed without controlling device, with optimized TMD, Diagrid Structural System (DSS), and MDSS. All of the models are investigated by using SAP2000. All of the buildings are analyzed and evaluated under El-centro earthquake. The response of proposed MDSS under earthquake is compared with the RFwoOSTMD, RFwOSTMD and DSS. The results show that the proposed MDSS is preferable than the DSS, as well as RFwOSTMD.

Tuned Mass Damper (TMD) is a prominent mean of controlling structural vibration. Typically the TMDs are installed at the top of the structure. In this study, the effectiveness of the multiple tuned mass dampers (MTMD) distributed along with the height of structure is investigated for seismic loading. A ten storey building with lateral degree of freedom is modeled with distributed tuned mass dampers in the platform of MatLab R2010a. Though the first mode of a MDOF system dominates in response of the structure, it is also observed that the other mode can also have a significant role in the response reduction. Suitable location for the installation of the TMDs and there tuning frequencies are selected based on the mode shape and frequencies of the uncontrolled structure respectively. It is observed that distributed TMD is more effective than Single TMD and Multiple TMD installed at top of the structure in response reduction.