کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
267661 504408 2011 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
On the buckling of axially restrained steel columns in fire
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات مهندسی ژئوتکنیک و زمین شناسی مهندسی
پیش نمایش صفحه اول مقاله
On the buckling of axially restrained steel columns in fire
چکیده انگلیسی

This paper describes the behaviour of restrained steel columns in fire. It follows the introduction of extra load into the column through the axial restraint of the surrounding cooler structure and the consequential buckling. Key to this understanding is the post-failure behaviour and re-stabilisation of the column, which is discussed with reference to a finite element model and an analytical model. Through bi-directional control of the temperature, the finite element model allows the snap-back behaviour to be modelled in detail and the effects of varying slenderness and load ratio are investigated. The analytical model employs structural mechanics to describe the behaviour of a heated strut, and is capable of explaining both elastic and fully plastic post-buckling behaviour.Through this detailed explanation of what happens when a heated column buckles, the consequences for steel-framed building design are discussed. In particular, the need to provide robustness is highlighted, in order to ensure that alternative load paths are available once a column has buckled and re-stabilised. Without this robustness, the dynamic shedding of load onto surrounding structures may well spread failure from a fire’s origin and lead to progressive collapse.


► The snap-back behaviour of restrained steel columns in fire is modelled in detail.
► It is investigated using both a finite element model and an analytical model.
► It includes post-failure behaviour and re-stabilisation of the column.
► Both elastic and fully plastic post-buckling behaviour is explained.
► This paper demonstrates the need to provide robustness in steel-framed building design.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Engineering Structures - Volume 33, Issue 10, October 2011, Pages 2832–2838
نویسندگان
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