Abstract

The elegant stress-ribbon systems are efficient in pedestrian bridges and long-span roofs. Numerous studies defined corrosion of the steel ribbons as the main drawback of these structures. Unidirectional carbon fiber-reinforced polymer (CFRP) is a promising alternative to steel because of lightweight, high strength, and excellent corrosion and fatigue resistance. However, the application of CFRP materials faced severe problems due to the construction of the anchorage joints, which must resist tremendous axial forces acting in the stress-ribbons. Conventional techniques, suitable for the typical design of the strips made from anisotropic material such as steel, are not useful for СFRP strips. The anisotropy of СFRP makes it vulnerable to loading in a direction perpendicular to the fibers, shear failure of the matrix, and local stress concentrations. This manuscript proposes a new design methodology of the gripping system suitable for the anchorage of flat strips made from fiber-reinforced polymers. The natural shape of a logarithmic spiral Nautilus shell describes the geometry of the contact surface. The continuous smoothly increasing bond stresses due to friction between the anchorage block and the CFRP strip surface enable the gripping system to avoid stress concentrations. The 3D-printed polymeric prototype mechanical tests proved the proposed frictional anchorage system efficiency and validated the developed analytical model.

中文翻译：

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扁平CFRP条带的自然灵感抓取系统的开发，用于应力带结构布局

摘要

优雅的应力带系统在人行天桥和大跨度屋顶中非常有效。许多研究将钢带的腐蚀定义为这些结构的主要缺点。单向碳纤维增强聚合物（CFRP）由于重量轻，强度高以及出色的耐腐蚀和抗疲劳性，因此是钢的有前途的替代品。但是，由于锚固接头的构造，CFRP材料的应用面临着严重的问题，锚固接头必须抵抗作用在应力带中的巨大轴向力。适用于由各向异性材料（例如钢）制成的条带的典型设计的常规技术不适用于СFRP条带。FRP的各向异性使其易受垂直于纤维的方向的载荷，基体的剪切破坏和局部应力集中的影响。该手稿提出了一种夹持系统的新设计方法，适用于锚固由纤维增强聚合物制成的扁平条。对数螺旋鹦鹉螺壳的自然形状描述了接触表面的几何形状。由于锚固块和CFRP条带表面之间的摩擦而导致的连续平稳增加的粘结应力使夹持系统能够避免应力集中。3D打印的聚合物原型机械测试证明了拟议的摩擦锚固系统的效率，并验证了开发的分析模型。由于锚固块和CFRP条带表面之间的摩擦而导致的连续平稳增加的粘结应力使夹持系统能够避免应力集中。3D打印的聚合物原型机械测试证明了拟议的摩擦锚固系统的效率，并验证了开发的分析模型。由于锚固块和CFRP条带表面之间的摩擦而导致的连续平稳增加的粘结应力使夹持系统能够避免应力集中。3D打印的聚合物原型机械测试证明了拟议的摩擦锚固系统的效率，并验证了开发的分析模型。