نوع مقاله : علمی - پژوهشی
نویسندگان
1 دانشجوی دکتری، دانشکده مهندسی عمران، دانشگاه صنعتی نوشیروانی بابل، بابل، مازندران
2 استاد، دانشکده مهندسی عمران، دانشگاه صنعتی نوشیروانی بابل، بابل، مازندران
3 دانشیار، دانشکده مهندسی عمران، دانشگاه صنعتی نوشیروانی بابل، بابل، ایران
چکیده
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
This paper aims to estimate the maximum target displacement and structural performance at different damage levels under Incremental Dynamic Analysis (IDA) based on the Park-Ang damage index model. The mentioned method is based on the intersection of the pushover capacity curve with the seismic risk demand curve, known as the N2 method, and the development of the energy-based Incremental Dynamic Analysis (IDA) until the collapse condition. Therefore, the nonlinear response acceleration ratio based on the Park-Ang damage model at different damage levels and periods of vibration was determined to develop the nonlinear response spectra from the elastic ones. Then, a relationship between the strength reduction factor (R), damage model, and period of vibration (R-DI-T) was extended to predict the target displacement at the desired seismic hazard level, known as the performance point. Also, the mathematical equations based on least-square nonlinear regression analysis were obtained to estimate the maximum nonlinear acceleration ratio and R-DI-T relation. Three 1-, 7-, and 10-story steel moment resisting frames and two empirical reinforced concrete (RC) pier were used to evaluate the accuracy of the proposed method. Statistical results show that the difference between estimated and mean displacements obtained from nonlinear time history analysis is not higher than 20%. Also, the mentioned difference is valid for IN2 diagrams achieved from the estimated and direct values.
کلیدواژه‌ها [English]
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