Volume 24, Issue 6 (2024)
MCEJ 2024, 24(6): 69-80 |
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Zahedi H, Ganjavi B, Bararnia M. Effect of frequency dependency of impedance functions on seismic damage index of soil-structure systems. MCEJ 2024; 24 (6) :69-80
URL: http://mcej.modares.ac.ir/article-16-72922-en.html
URL: http://mcej.modares.ac.ir/article-16-72922-en.html
1- University of Mazandaran
2- Associate Professor, Department of Civil Engineering, Mazandaran University, Babolsar ,b.ganjavi@umz.ac.ir
3- PhD, Department of Civil, Water and Environmental Engineering, Shahid Beheshti University, Tehran
2- Associate Professor, Department of Civil Engineering, Mazandaran University, Babolsar ,
3- PhD, Department of Civil, Water and Environmental Engineering, Shahid Beheshti University, Tehran
Abstract: (647 Views)
In seismic analysis and design of conventional structures, it is generally assumed that the soil beneath the foundation is rigid and, thus, its flexibility is not taken into account. Soil flexibility can affect the response of structures through complex phenomenon of dynamics soil-structure interaction (SSI) effect. It is believed that effective soil and structural parameters could in some case significantly influence seismic response of structures in different manners and conditions. In this study, through an intensive parametric study, the effect of frequency dependency of impedance functions on constant-ductility damage index parameter of soil-structure SDOF systems subjected to ordinary strong ground motions were investigated. To this end, the soil-structure system was modeled by sub-structure method and the foundation was modeled as a homogeneous elastic half-space using the concept of the cone model. The soil-structure systems with shallow foundation were modeled based on various SSI key parameters, and were then analyzed under 15 earthquake ground motions recorded on soft soils. Results of this study show that, in average, the maximum effect of excitation frequency dependency on seismic damage index is referred to the intensive SSI models, slender structures and with low level of inelastic behavior, which, in critical case, will occur in one or limited values of fundamental period. The maximum mean value is about 13.56% which cannot be considered as a criterion for practical application. Therefore, to have a logical criterion for practical purpose, the average values of entire periodic region in 15 earthquake ground motions were computed and, then, the maximum value, i.e., 5.76, was considered to make a decision. Overall, the results indicate that for soil-structure SDOF systems with shallow foundation, frequency dependency of impedance functions on damage index of structures subjected to earthquake ground motions would not have a remarkable effect and thus can be practically ignored in seismic analysis and design of soil-structures systems with shallow foundations. This finding being debated by researchers can lead to using a simple soil-structure system with less computational time and effort.
Keywords: Seismic damage index, Soil-Structure interaction, Inelastic behavior, SDOF systems, Impedance functions, Excitation frequency dependency.
Article Type: Original Research |
Subject:
Earthquake
Received: 2023/12/13 | Accepted: 2024/07/10 | Published: 2024/11/30
Received: 2023/12/13 | Accepted: 2024/07/10 | Published: 2024/11/30
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