کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4927078 1431691 2017 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Proposed mechanism for mid-span failure of pile supported river bridges during seismic liquefaction
ترجمه فارسی عنوان
مکانیزم پیشنهادی برای شکست نزولی پلهای پشتیبانی شده از شمع در طول مایع سازی لرزه ای
کلمات کلیدی
پل ها، خرابی متوسط، زمین لرزه، تبدیل به مایع، توده، سفتی، سختی، جابجایی قله، دوره طبیعی،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات مهندسی ژئوتکنیک و زمین شناسی مهندسی
چکیده انگلیسی
Pile supported river bridge failures are still observed in liquefiable soils after most major earthquakes. One of the recurring observations is the mid span collapse of bridges (due to pier failure) with decks falling into the river while the piers close to the abutment and the abutment itself remain stable. This paper proposes a mechanism of the observed collapse. It has been shown previously through experiments and analytically that the natural period of bridge piers increases as soil liquefies. Due to the natural riverbed profile (i.e. increasingly higher water depth towards the centre of the river), the increase in natural period for the central piers is more as compared to the adjacent ones. Correspondingly, the displacement demand on the central pier also increases as soil progressively liquefies further promoting differential pier-cap displacements. If the pier-cap seating lengths for decks are inadequate, it may cause unseating of the decks leading to collapse. The collapse of Showa Bridge (1964 Niigata earthquake) is considered to demonstrate the mechanism. The study suggests that the bridge foundations need to be stiffened at the middle spans to reduce additional displacement demand.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Soil Dynamics and Earthquake Engineering - Volume 102, November 2017, Pages 41-45
نویسندگان
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