Web crippling behaviour of pultruded glass fibre reinforced polymer sections
Web crippling behaviour of pultruded glass fibre reinforced polymer sections
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DOI：
10.1016/j.compstruct.2013.10.020
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发表时间：
2014-02
影响因子：
6.3
通讯作者：
Chao Wu;Yu Bai
中科院分区：
文献类型：
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作者：
Chao Wu;Yu Bai
采用四种不同尺寸的方形空心截面，研究了玻璃钢拉挤型材在集中荷载作用下的腹板失稳性能。采用端部双翼缘（ETF）和端部双翼缘（ITF）加载条件，试件固定在承载板上。试件也放置在地面上，端部或内部承载载荷，以模拟楼板托梁构件的加载条件。观察到的破坏开始于腹板-翼缘连接处，随后是腹板的屈曲或压碎，这些模式与金属截面完全不同。相应地，根据渐进破坏过程定义了两个荷载极限。讨论了加载位置（端部加载或内部加载）以及支承条件（在支承板上或在地面上）对腹板失稳行为的影响。确定在脉动方向上的有效腹板面积以表征腹板内的载荷传递路径。最后，提出了一个简单的机制为基础的设计方程来估计这种拉挤玻璃钢型材进行腹板失稳的强度。
We investigated the web crippling behaviour of pultruded GFRP sections under concentrated loading, employing four square hollow sections of different sizes. End-two-flange (ETF) and interior-two-flange (ITF) loading conditions were adopted, with specimens seated on a bearing plate. Specimens were also placed on the ground with end or interior bearing load to simulate the loading conditions of floor joist members. The observed failure initiated at web–flange junctions and was followed by buckling or crushing in the webs, and these modes were quite different from metallic sections. Correspondingly, two load limits were defined according to the progressive failure process. The effects of the loading positions (end loading or interior loading) as well as the supporting conditions (on a bearing plate or on the ground) on the web crippling behaviour are discussed. An effective web area in the pultrusion direction is identified to characterize the load transfer path within the web. Finally, a simple mechanism based design equation is proposed to estimate the strength of such pultruded GFRP sections subjected to web crippling.