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عنوان فارسی مقاله:
مدلسازی عددی موضوع اسلب طبقه کامپوزیت برای تغییر شکل بزرگ
عنوان انگلیسی مقاله:
Numerical Modelling of Composite Floor Slabs Subject to Large Deflections
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Over the last number of years, the performance of buildings with steel/concrete composite floors during fire conditions has received increasing attention from the structural engineering community (e.g. [1–3]). This mainly followed observations during real building fires such as the Broadgate and Basingstoke fires where buildings with composite floors performed much better than expected due to the ability of the slabs to survive and redistribute loads around the structure. Largescale experiments were conducted at Cardington [4] to investigate the behaviour under more controlled conditions and it was observed that traditional prescriptive design methods are overly conservative and steel-framed buildings with composite floors inherently possess suffi- cient ductility and resistance during extreme events to delay or even prevent failure. The Cardington experiments led to a surge in interest from the engineering research community with work focused on developing a greater understanding of the behaviour through further experimental and numerical analysis. The response of a two-way spanning floor slab during a fire is particularly complex owing to the interrelated material and geometric nonlinearities which develop with increasing levels of deflection and temperature. Although the slab exhibits significantly lower bending capacity in a fire due to the degradation of material strength and stiffness, the development of tensile membrane action can lead to a greater overall capacity than predicted by the design codes (e.g. Eurocodes). However, before tensile membrane action can be incorporated into design standards, a detailed and fundamental understanding of the behaviour of floor slab must be attained. Towards this end, a limited number of experimental programmes have studied the large-deflection performance of isolated slab elements both at ambient and elevated temperature (e.g. [2,5]). However, largescale experiments are prohibitively expensive and time-consuming and so a full examination of the various parameters affecting the behaviour is not realistically feasible. Therefore, a number of purpose built numerical models have been developed by the research community to study the effects influencing the response of structures and floor slabs in particular under fire loading scenarios (e.g. [6,7]). Although these models have led to considerable advancement in the understanding of structures in fire, they are often not suitable for design as they can be computationally expensive and the scale of the structures may be diffi- cult to realistically represent. Practical design guidance and software for steel framed buildings with composite floor slabs in fire have been proposed, the most well-known of which is the BRE method [8,9], to help engineers achieve safe and efficient designs. However, several shortcomings of the BRE method have been presented by various researchers (e.g. 3, [10]) including an absence of appropriate failure criteria and also a lack of consistency in terms of the method providing a conservative or unconservative assessment of the load carrying capacity, depending on the aspect and reinforcement ratios of the slab.
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کلمات کلیدی:
Cracking over Reinforced Concrete Floor Slabs and Their Large ... https://www.jstage.jst.go.jp/article/coj1975/16/10/16_11/_article Cracking over Reinforced Concrete Floor Slabs and Their Large Deflections ... mostly implemented in Hokkaido, on the existing r. c. slabs subjected to the ... Failure Assessment of Lightly Reinforced Floor Slabs. I: Experimental ... ascelibrary.org/doi/full/10.1061/(ASCE)ST.1943-541X.0000420?src=recsys The large-displacement performance of floor slabs has been the focus of intensive ...... The load-deflection responses for both specimens are included in Fig. [PDF]Download Now! - School of Mechanical, Aerospace and Civil ... www.mace.manchester.ac.uk/project/research/structures/strucfire/.../malaysia2.pdf by T LENNON - 2003 - Cited by 10 - Related articles May 10, 2003 - number of large scale natural fire tests have taken place over the ... The complex interactions between structural members within a real building subject to a real fire have been .... maximum deflection of floor slab of 115mm. American Environmentalism: Philosophy, History, and Public Policy https://books.google.com/books?isbn=0415633184 J. Michael Martinez - 2013 - Law ... action in floor slabs and bridge decks has been subject of numerous studies, ... with large deflections umn over beam stiffness ratio (Beeby and Fathibitaraf, ... Tensile Membrane Action of Thin Slabs Exposed to Thermal Gradients eprints.whiterose.ac.uk/105472/1/Whole_paper.pdf by AK Abu - 2013 - Cited by 4 - Related articles slab capacity at large deflections, so that it is capable of bearing the fire limit state loading at the required ...... composite floor slabs subject to fire: Part 1: Theory.
