en Optimal design Optimal design پژوهشي Research <p>Tuned &nbsp;mass &nbsp;dampers &nbsp;(TMDs) &nbsp;are &nbsp;as &nbsp;a &nbsp;efficient &nbsp;control &nbsp;tool &nbsp;in &nbsp;order &nbsp;to &nbsp;reduce &nbsp;undesired vibrations &nbsp;of &nbsp;tall &nbsp;buildings &nbsp;and &nbsp;large&ndash;span &nbsp;bridges &nbsp;against &nbsp;lateral &nbsp;loads &nbsp;such &nbsp;as &nbsp;wind &nbsp;and&nbsp;earthquake. Although many researchers has been widely &nbsp;investigated &nbsp;TMD systems &nbsp;due to&nbsp;its &nbsp;simplicity &nbsp;and &nbsp;application, &nbsp;the &nbsp;optimization &nbsp;of &nbsp;parameters &nbsp;and &nbsp;placement &nbsp;of &nbsp;TMD &nbsp;are&nbsp;challenging tasks. Furthermore, ignoring the effects of soil&ndash;structure interaction (SSI) may&nbsp;lead to unrealistic desig of structure and its dampers. Hence, the &nbsp;effects of SSI should be&nbsp;considered &nbsp;in &nbsp;the &nbsp;design &nbsp;of &nbsp;TMD. &nbsp;Therefore, &nbsp;the &nbsp;main &nbsp;aim &nbsp;of &nbsp;this &nbsp;study &nbsp;is &nbsp;to &nbsp;optimize&nbsp;parameters &nbsp;of &nbsp;TMD &nbsp;subjected &nbsp;to &nbsp;earthquake &nbsp;and &nbsp;considering &nbsp;the &nbsp;effects &nbsp;of &nbsp;SSI. &nbsp;In &nbsp;this&nbsp;regard, &nbsp;the &nbsp;parameters &nbsp;of &nbsp;TMD &nbsp;including &nbsp;mass, &nbsp;stiffness &nbsp;and &nbsp; damping &nbsp;optimization &nbsp;are&nbsp;considered &nbsp;as &nbsp;the &nbsp;variables &nbsp;of &nbsp;optimization. &nbsp;The &nbsp;maximum &nbsp;absolute &nbsp;displacement &nbsp;and&nbsp;acceleration of structure are also simultaneously selected as objective functions. The multi &ndash;objective particle &nbsp;swarm optimization &nbsp;(MOPSO) algorithm &nbsp;is adopted &nbsp;to find &nbsp;the &nbsp;optimal&nbsp;parameters &nbsp;of &nbsp;TMD. &nbsp;In &nbsp;this &nbsp;study, &nbsp;the &nbsp;Lagrangian &nbsp;method &nbsp;is &nbsp;utilized &nbsp;for &nbsp;obtaining &nbsp;the&nbsp;equations of motion for SSI system, and the time domain analysis is implemented based on&nbsp;Newmark method. In order to investigate the effects of SSI in the optimal design of TMD, a&nbsp;40 storey shear building with a TMD subjected to the El&ndash;Centro earthquake is considered.&nbsp;The &nbsp;numerical &nbsp;results &nbsp;show &nbsp;that &nbsp;the &nbsp;SSI &nbsp;effects &nbsp;have &nbsp;the &nbsp;significant &nbsp;influence &nbsp;on &nbsp;the&nbsp;optimum parameters of TMD.</p> tuned mass dampers, soil–structure interaction, displacement, acceleration, multi–objective particle swarm optimization algorithm. 595 610 http://ijoce.iust.ac.ir/browse.php?a_code=A-10-66-119&slc_lang=en&sid=1 M. Khatibinia 180031947532846001040 180031947532846001040 Yes H. Gholami 180031947532846001041 180031947532846001041 No S. F. Labbafi 180031947532846001042 180031947532846001042 No