نوع مقاله : مقاله پژوهشی
نویسندگان
دانشکده مهندسی عمران، آب و محیط زیست- دانشگاه شهید بهشتی- تهران- ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Structures behave differently on soil than on a rigid base. Given the importance of performance-based design, the direct method for soil-structure interaction problem is essential for accurate characterization of the non-linear behavior of the soil and the structure. Using direct method in FE modeling of SSI problem poses several challenges. These include accurately representing the semi-infinite soil domain, accounting the inertia effects, radiation damping, and wave propagation, and properly applying earthquake excitation at the boundaries, which coincide with the energy-absorbing boundaries. This article presents a precise and practical approach to tackle these difficulties, which is well-suited for implementation in FE software such as ABAQUS. This approach utilizes the combination of the domain reduction method (DRM) and Lysmer energy-absorbing boundaries. The accuracy of the model is assessed by some validations and compared by traditional Winckler's approaches; results showed the superior accuracy of the proposed approach. Furthermore, seismic analyses of three types of concrete structures (4, 8 and 12-story frames) under various seismic scenarios are investigated. Seismic frequency content, soil type, and other parameters are examined. The analysis results showed that parameters such as frequency content, soil type, and distance from the fault affect the magnitude and trend of response analyses. The findings of this research indicated that the difference in responses of buildings located on soil type 3 compared to soil type 2 reached up to 36.3%, and under near-field records compared to far-field records, up to 35.5% was observed.
کلیدواژهها [English]
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