کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
267438 504402 2012 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Behavior of precast prestressed concrete bridge girders involving thermal effects and initial imperfections during construction
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات مهندسی ژئوتکنیک و زمین شناسی مهندسی
پیش نمایش صفحه اول مقاله
Behavior of precast prestressed concrete bridge girders involving thermal effects and initial imperfections during construction
چکیده انگلیسی

The instability of precast prestressed concrete bridge girders during construction have been of particular concern to bridge engineers. After they are installed on bearing supports, prestressed concrete girders are immediately subjected to environmental thermal loads that may be exacerbated by fabrication and construction errors. Thus, in this research, the environmental thermal loads, which cause extremes in thermal deformations in precast prestressed concrete girders, were determined. Then a three-dimensional nonlinear finite element sequential analysis procedure was developed to evaluate the behavior of a precast prestressed concrete girder subjected to both thermal loads and geometry and support imperfections during each construction stage. This analysis indicated instability in a 30-m long prestressed concrete BT-1600 girder when total lateral deformation in the middle height of the girder at mid-span exceeded about 25 cm.


► This study developed 3D FEA procedure to evaluate the behavior of concrete girders.
► This analysis assessed combined effects of initial imperfections and thermal response.
► The thermal loads were determined from environmental variations and girder orientations.
► This study proposed simple equations for calculating the maximum thermal movements.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Engineering Structures - Volume 42, September 2012, Pages 1–8
نویسندگان
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