مشخصات پژوهش

صفحه نخست /Increasing Nonlinear Behavior ...
عنوان Increasing Nonlinear Behavior at the Soil-foundation Interface to Improve Seismic Performance of Structures
نوع پژوهش مقاله چاپ شده
کلیدواژه‌ها Seismic performance of structures, Nonlinear soil-structure interaction, Strip Foundation, Ductility, Drift, Safety factor
چکیده It is anticipated that the performance of the structure is influenced by nonlinear behavior at the soil-foundation interface. Results of the previous studies have shown that the vertical Safety Factor (FS) of the foundation is not a suitable criterion to estimate the effectiveness of soil-foundation nonlinearity on the performance of structures. To investigate the subject, three frames were designed and placed on foundations in the current study. The soil was simulated using by distributed Winkler elements considering Qz behavior. For assessing the ductility demand of beams and columns along with story drift ratios, the soil-structure systems were subjected to artificial records and also some actual ground motion records. The response spectra of the artificial records have been matched with the design spectrum. It was observed that by decreasing FS from 5 to 2, the ductility demands of the elements and drift ratios of the stories decreased significantly in some cases, while the influence was not noticeable in other cases. It was concluded that soil-structure systems can be divided into two parts. By introducing an index, it was shown that if the ratio of the moment capacity of the soil-foundation part to the moment capacity of the super-structure is less than one, the performance of the super-structure can be improved because it does not receive energy higher than the capacity of the soil-foundation part. Whenever the moment ratio is greater than one, the super-structure does not take noticeable advantages from soil nonlinearity, even if low FS is considered for the foundation.
پژوهشگران احمد رضا همتی (نفر دوم)، امیرحسین جعفریه (نفر اول)