Document Type : Research Article
Msc. graduated of structural engineering/ University of Zanjan
Civil Engineering Group, Engineering Department, University of Zanjan, Zanjan, Iran
Civil Engineering Group, Engineering Department, University of Zanjan, Zanjan, Iran.
Tuned Mass Damper (TMD) is amongst the simplest and, the most usable passive control tools, to improve the behavior of various structures. However, factors such as the characteristics of the soil beneath the structure and the presence of an adjacent structure could also affect the performance of that. This study investigates the effects of using a TMD in two 20-story steel moment frames with two different aspect ratios on the seismic response of them in fixed and flexible base and considers the adjacency of two structures, known as Structure-Soil-Structure Interaction (SSSI). To apply the effects of SSSI, reduced stiffness matrix of the foundation-soil-foundation system, considering as a plane strain problem, is obtained through analysis of a finite element model in Abaqus and is applied to the 2D models of end frame of the structures using a set of springs and a newly developed element in OpenSEES. Furthermore, the particle swarm optimization (PSO) algorithm is used to optimize the design parameter of TMD. The average results obtained from time history analysis under ten far-field seismic records specifies that, exploiting a TMD with parameters optimized in a 20-story structure in both fixed-base case and considering SSSI, can reduce the seismic responses in the form of the average of maximum drift and displacement. However, the SSSI effect can changes the responses of structures equipped with dampers; in such a way that, in high-rise structures with a higher value of the height to dimension ratio (thinner structure), the response of structures is increased.