نوع مقاله : علمی - پژوهشی
1 کارشناس ارشد مهندسی عمران، گروه مهندسی عمران، واحد بوشهر، دانشگاه آزاد اسلامی، بوشهر، ایران
2 استادیار، گروه مهندسی عمران، واحد بوشهر، دانشگاه آزاد اسلامی، بوشهر، ایران
عنوان مقاله [English]
In recent years, the use of steel bracing system in reinforced concrete structures has expanded. The bracing system can also be used effectively to improve existing concrete structures. Considering the soil -structure interaction in the analysis of the structure compared to the case where the soil of the substructure is considered rigid causes a change in the behavior of the structure during seismic excitation. The present study is the result of a realistic approach to the problem of soil effects on the seismic behavior of concrete structures with steel bracing. In this research, considering the 6-story concrete structure, improved with X-bracing on three types of soil C, D and E according to ASCE7-16 standard, under appropriate earthquake records, the effect of soil-structure interaction has been investigated. In modeling, nonlinear behavior is assumed for structure and linear and nonlinear behavior is assumed for soil and nonlinear dynamic analysis of soil -structure interaction is performed using direct method and two-dimensional geometric modeling in Opensees software and the response of structure by considering two The rigid base and the flexible base are compared. The results show that considering the soil -structure interaction in models improved by steel bracing according to the type of soil, increases the period in some cases up to about 72% and reduces the base shear to about 49% compared to the rigid bed in the structure.