کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6750613 | 1430682 | 2018 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Response modification factor of concentrically braced frames with hexagonal pattern of braces
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی عمران و سازه
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چکیده انگلیسی
This paper presents the response modification factor 'R' of the new bracing configuration of concentrically braced frames (CBFs). This innovative bracing system called “hexa-braced frame” is composed of hexagonal pattern of braces in which vertical structural elements connect the V and inverted-V bracings over three stories to form the hexagonal bracing configuration. FEMA P695 provides a global methodology to quantify seismic performance factor for new structural systems. Following this methodology, a set of 4-, 10- and 20-story archetypes representing low-, mid- and high-rise buildings, respectively, were used to evaluate the R factor of the hexa-braced frame. Trial values of R factor were examined through nonlinear static and dynamic analyses to satisfy acceptance criteria of the P695 methodology. The results were compared with the responses of similar X-braced frame models as the benchmark. The iterative process to determine R factor for the hexa-braced frame was performed using values of R factor, 6 and 7. Based on the performance evaluation of hexa- braced frame archetypes by measuring their collapse fragility, the value of R factor, 7 achieved the safety margin against collapse during the earthquakes. As expected, the analysis results confirmed the given value of R factor 6 for X-braced frame system in design codes (ASCE 7).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Constructional Steel Research - Volume 148, September 2018, Pages 658-668
Journal: Journal of Constructional Steel Research - Volume 148, September 2018, Pages 658-668
نویسندگان
Ali Kheyroddin, Niloufar Mashhadiali,