کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7210874 1469240 2017 17 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of higher modes and MDOF on strength reduction factor of elastoplastic structures under far and near-fault ground motions
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی (عمومی)
پیش نمایش صفحه اول مقاله
Effects of higher modes and MDOF on strength reduction factor of elastoplastic structures under far and near-fault ground motions
چکیده انگلیسی
In seismic codes, the force strength reduction factor is proposed to transform elastic to inelastic strength. The ductility reduction factor, Rμ, plays a key role on R factor if no overstrength is present. The Rμ is determined by SDOF systems. But the higher mode (HM) and Multi-Degree-of-Freedom (MDOF) effects need to be considered to extract the R factor. These effects are studied by proposing αv-MDOF via at least 1764 Nonlinear dynamic Analysis of 2D-frames. Also a sensitivity study has been performed on Rμ and αv-MDOF. Results obtained from studies conducted on the frames, indicate that HM and MDOF effects have a considerable influence on the base shear. Also the αv-MDOF is typically higher than unity both for ordinary and for near-field earthquakes and it is affected by period, span number and ductility level. These effects are remarkable for near-field motions. Finally, a simplified practical expression is proposed to estimate the αv-MDOF.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ain Shams Engineering Journal - Volume 8, Issue 2, June 2017, Pages 127-143
نویسندگان
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