کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
267662 504408 2011 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Transverse fatigue behaviour of lightly reinforced concrete bridge decks
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات مهندسی ژئوتکنیک و زمین شناسی مهندسی
پیش نمایش صفحه اول مقاله
Transverse fatigue behaviour of lightly reinforced concrete bridge decks
چکیده انگلیسی

The transverse fatigue behaviour of the top slab of box-girder bridges is dealt with in this paper. The cantilevers and central span of the top slab usually require a small reinforcement ratio and significant slenderness to fulfil the static design requirements. Nevertheless, the application of a high number of load cycles due to traffic or train passages may lead to fatigue damage accumulation. An experimental program on half-scale specimens reproducing the bridge slab was carried out. The fatigue failure was due to brittle fracture of the reinforcement, which could be predicted safely by available S–N curves. Furthermore, the experimental results showed the cycle-dependent reduction of tension stiffening, which was very significant due to the large tension stiffening capacity of lightly reinforced members. Special attention was paid to the development of negative tension stiffening contribution at unloading stages. This effect indicates that permanent and residual cracks and deflections are larger than those calculated with the fully cracked member. The experimental results showed that negative tension stiffening in members manufactured with self-compacting concrete can be larger than those with normally vibrated concrete.


► Transverse fatigue tests were conducted on specimens reproducing the top slab of concrete bridges.
► Repeated loads significantly affect serviceability since deflections increase with load cycles.
► Negative tension stiffening develops in the unloading stages.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Engineering Structures - Volume 33, Issue 10, October 2011, Pages 2839–2849
نویسندگان
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