The Influence of Tensile Membrane Action on Fire-exposed Composite Concrete Floor-steel Beams with Web-openings
The Influence of Tensile Membrane Action on Fire-exposed Composite Concrete Floor-steel Beams with Web-openings
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张拉膜作用对腹板开口组合混凝土楼板钢梁火灾的影响
DOI：
10.1016/j.proeng.2013.08.117
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Wong B
中科院分区：
文献类型：
--
作者：
Wong B
在对卡丁顿的复合材料框架进行一系列全尺寸火灾试验的基础上，现已建立了一种计算复合地板系统受火性能的设计方法。该方法以一种简化的方式模拟了组合楼板中拉伸膜作用的影响，组合楼板是由一系列组合梁组成的，这些组合梁使用的是基本上未受保护的实腹式钢竖梁。薄膜作用的发展取决于受火灾影响的板的边界周围的保护梁保持垂直支撑的条件。蜂窝梁可以实现与相同深度的无孔I形梁相同的强度，显著减少钢质量，并能够在梁深度内容纳服务管道，因此使用复合蜂窝梁作为楼板构件在建筑中变得越来越流行。由于对开孔截面的研究普遍缺乏，关于开孔截面在火灾条件下的设计指导仍然相当原始。此外，拉伸膜作用在组合楼板与蜂窝钢下横梁可以表现出非常不同的行为，在火灾时，当使用实腹部分。作为对组合板系统中蜂窝梁防火性能的初步研究，已进行了参数研究，包括拉伸膜作用对提高承载能力的影响。边缘支撑条件的变化的影响也进行了研究。结果表明，受保护的周边梁保持其承载能力，只受到小的垂直位移，虽然腹板后屈曲被观察到发生在受保护的次梁附近的支持。这表明，垂直支撑的维护是不够的，板面板与蜂窝梁。腹板柱屈曲或空腹机制可能决定结构破坏的模式，这表明开口的尺寸及其位置需要仔细设计。
On the basis of a series of the full-scale fire tests carried out on the composite frame at Cardington, a design method is now well established to calculate the performance of composite flooring systems subject to fire. The method models in a simplified fashion the influence of tensile membrane action in composite floor slabs which are formed as an array of composite beams using solid-web steel downstand beams which are largely unprotected. The development of membrane action depends on the conditions of vertical support maintained around the boundaries of the fire-affected slab panels by protected beams. Cellular beams can achieve the same strength as unperforated I-beams of the same depth, with significantly reduced steel mass, and the ability to accommodate service ducts within the beam depth, and therefore the use of composite cellular beams as floor members is becoming increasingly popular in construction. Due to the general lack of research on perforated sections, the guidance about their design for fire conditions remains rather primitive. Moreover, tensile membrane action in composite floor slabs with cellular steel downstand beams could exhibit very different behaviour in fire from that when solid-web sections are used. A parametric study has been carried out as an initial investigation into the fire performance of cellular beams within composite slab systems, including the effects of tensile membrane action in enhancing the load-carrying capacity. The effects of changes to the edge support conditions are also investigated. The results show the protected perimeter beams maintained their load-carrying capacity and were subject only to small vertical displacements, although web-post buckling was observed to occur on the protected secondary beam near to a support. This suggests that maintenance of vertical support is not sufficient for a slab panel with cellular beams. Web-post buckling or the Vierendeel mechanism may govern the mode of structural failure, indicating that the sizes of openings and their positioning necessitate careful design.
影响因子：
3.1
作者：
A. Nadjai;O. Vassart;F. Ali;D. Talamona;A. Allam;M. Hawes
通讯作者：
M. Hawes
组合梁的性能和设计
DOI：
--
发表时间：
1984
期刊：
影响因子：
--
作者：
P. Ansourian
通讯作者：
P. Ansourian
边缘支撑和配筋率对火灾中板面板破坏的影响
DOI：
--
发表时间：
2008
期刊：
影响因子：
--
作者：
A. Abu;I. Burgess;R. Plank
通讯作者：
R. Plank