Structure-Soil-Structure Interaction (SSSI) effects on seismic response of low-, mid- and high-rise steel moment resisting frame structures

Document Type : Research Article


1 Msc. student of structural engineering/ University of Zanjan

2 Civil Engineering Group, Engineering Department, University of Zanjan, Zanjan, Iran.

3 Civil Engineering Group, Engineering Department, University of Zanjan, Zanjan, Iran


Unknown situations or factors in the design of a structure, such as underlying soil characteristics and the presence of adjacent structures, can affect the reliability and, consequently, the cost of the project. Therefore, the effects of soil-structure interaction as well as the simultaneous effects of this interaction in the presence of adjacent structures on the seismic response of 3, 9 and 20-story benchmark steel moment resisting frame structures are investigated, including six different adjacency cases of the structures in three different distances. The effect of soil-structure interaction is considered by using a hybrid method, in which the stiffness matrix of the soil system is obtained through analysis of a two-dimensional model in Abaqus considering a plain strain condition. Then, the obtained stiffness matrix is added to the nonlinear 2D model of the structure by using a set of pre-defined and a new developed element in OpenSEES. The results obtained from the time history analysis under ten far-field earthquake records show that the effect of soil-structure interaction on the response of a 20-story structure is more significant than the other two structures and leads to a maximum increase of 9 percent in the maximum average drift ratio and decrease of 6.99 percent in the average base shear in this structure compared to the fixed base. In addition, the presence of high-rise and mid-rise structures increase the maximum average drift ratio of low-rise structures by 10.44 and 9.36 percent and the average base shear in this structure by 2.87 and 3.93 percent, respectively, compared to the flexible base.


Main Subjects

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