Torsion Effect on the RC Structures using Fragility Curves Considering with Soil-Structure Interaction

Anvarsamarin, Ali; Rahimzadeh Rofooei, Fayaz; Nekooei, Masoud

doi:10.22075/jrce.2019.16080.1302

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	Torsion Effect on the RC Structures using Fragility Curves Considering with Soil-Structure Interaction
Journal of Rehabilitation in Civil Engineering
مقاله 1، دوره 8، شماره 1 - شماره پیاپی 17، اردیبهشت 2020، صفحه 1-21 اصل مقاله (1.61 M)
نوع مقاله: Regular Paper
شناسه دیجیتال (DOI): 10.22075/jrce.2019.16080.1302
نویسندگان
Ali Anvarsamarin¹؛ Fayaz Rahimzadeh Rofooei^* ²؛ Masoud Nekooei³
¹Department of civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
²Civil Engineering Department, Sharif University of Technology, Tehran, Iran
³Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
تاریخ دریافت: 10 مهر 1397، تاریخ بازنگری: 23 بهمن 1397، تاریخ پذیرش: 26 بهمن 1397
چکیده
The existence of torsion, as well as consideration of the Soil-Structure Interaction (SSI), increase the natural periods of the structure resulting from a subsequent decrease in the seismic demand of the system. This paper summarizes the probabilistic assessment in order to evaluate the collapse fragility curves in concrete moment resisting structure with different mass center eccentricities. A 12-story, 3-D, moment resisting concrete structure with fixed-base and deliberating SSI, both types of one- and two-way eccentricities is employed to estimate the collapse fragility curve by the IM-based approach. In consonance with the obtained results, increasing the torsion as a result of shifting the mass centers decreases the median of the collapse fragility curve. In addition, it was observed that the SSI consideration for soil type D with shear wave velocity of 180m/s to 360m/s leads to reduction of the median of collapse capacity by in the presence of torsion effect due to one- and two-way mass center eccentricities in range of 0-20% of the building's plan dimensions respectively. Put it differently, the fixed-base assumption overestimates the median of collapse capacity and leads to unsafe design. Moreover, shifting the mass centers of all the stories up to 20% of the building's plan dimensions, with or without the consideration of the SSI, decreases the median of collapse capacities and increases the seismic vulnerability of the building. Accordingly, the fixed-base assumption can be underestimated the dispersion range of the collapse fragility curve. The result reveals that the mentioned differences cannot be neglected.
کلیدواژه‌ها
Collapse Fragility Curve؛ Incremental Dynamic Analysis؛ Intensity Measure؛ Mass Center Eccentricity؛ Soil-Structure Interaction

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Torsion Effect on the RC Structures using Fragility Curves Considering with Soil-Structure Interaction