en Optimal design Optimal design پژوهشي Research High tall buildings are more susceptible to dynamic excitations such as wind and seismic excitations. In this paper, design procedure and some current applications of tuned mass damper (TMD) were studied. TMD was proposed to study response of 20 storey height building to seismic excitations using time history analysis with and without the TMD. The study indicates that the response of structures such as storey displacements and shear force of columns can be dramatically reduced by using TMD groups with specific arrangement in the model. The study illustrates the group of four TMDs distributed on the plane can be effective as reinforced concrete core shear wall. TMDs groups, high rise building, vibration control, time history analysis, SAP 2000 511 532 http://ijoce.iust.ac.ir/browse.php?a_code=A-10-1-84&slc_lang=en&sid=1 A. Abdelraheem Farghaly 18003194753284600435 18003194753284600435 Yes