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首页> 外文期刊>Journal of Composites for Construction >Flexural Performance and Moment Connection of Concrete-Filled GFRP Tube-Encased Steel I-Sections
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Flexural Performance and Moment Connection of Concrete-Filled GFRP Tube-Encased Steel I-Sections

机译：GFRP管混凝土I型截面的抗弯性能和弯矩连接

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摘要

A hybrid system, concrete-filled fiber-reinforced polymer (FRP) tube (CFFT)-encased steel I-section, is introduced. The embedded steel section enhances flexural strength and stiffness, and provides a pseudoductile behavior. It also facilitates connection of the CFFT member to footings or other members. Phase I of the experimental program addresses the flexural behavior of the system through ten beam specimens, including steel and CFFT control specimens. The glass fiber-reinforced polymer (GFRP) tubes varied in thickness and laminate structure. The steel section enhanced performance considerably, especially pseudoductility, in tubes with cross-ply laminates, in which a significant sustained reserved strength remains stable over large deflections on fracture of the tube. CFFTs with angle-ply tubes showed a considerable inherent ductility on their own, in which case, adding the steel section enhanced strength and stiffness only. Phase II addresses a moment connection through five cantilever tests. The connections consist of steel base plates welded to the steel sections, which are embedded into the CFFT members at various length (L_s)-to-span-length (L) ratios ranging from 0.1 to 1.0. Three distinct failure modes are observed. At (L_s/L) ratios of up to 0.17, premature bond failure occurs. At ratios of 0.17 to 0.47, the CFFT member achieves flexural tension failure of the tube just beyond the free end of the steel section. Beyond a 0.47 ratio, the full plastic hinge capacity is developed at the fixed end. A simple design-oriented model that predicts strengths at the full range of (L_s/L) ratios is developed and validated.
机译：介绍了一种混合系统，即用混凝土填充的纤维增强聚合物（FRP）管（CFFT）包裹的钢I型截面。嵌入式钢截面增强了弯曲强度和刚度，并提供了假延性。它还有助于将CFFT成员连接到基础或其他成员。实验程序的第一阶段通过十个梁样本（包括钢和CFFT控制样本）解决了系统的弯曲行为。玻璃纤维增​​强聚合物（GFRP）管的厚度和层压板结构各不相同。钢截面显着提高了具有交叉层压板的管材的性能，特别是假延展性，其中，显着的持续保留强度在管材断裂时大挠度下仍保持稳定。带有夹层管的CFFT本身显示出相当大的固有延展性，在这种情况下，添加钢型材仅增强了强度和刚度。第二阶段通过五个悬臂测试解决了力矩连接问题。连接由焊接到钢型材上的钢基板组成，这些钢基板以0.1到1.0的各种长度（L_s）与跨度（L）的比率嵌入CFFT构件中。观察到三种不同的故障模式。 （L_s / L）比率高达0.17时，会发生过早的粘结破坏。在0.17到0.47的比率下，CFFT构件会在刚超出钢截面自由端的位置实现管的弯曲拉伸破坏。超过0.47的比率，在固定端就可以发挥出全部的塑料铰链能力。开发并验证了一个简单的面向设计的模型，该模型可预测（L_s / L）比率的整个范围内的强度。

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