GFRP Shear Studs for GFRP-RC Flat Slab-Column Connections

Pultrall是加拿大领先的复合材料制造商，用于各种应用， 涉及交通、医疗、军事和建筑行业。其中一个应用程序是 用于混凝土结构的抗腐蚀纤维增强聚合物（FRP）钢筋的开发， pulmonary过程。这些酒吧已被证明是一个很好的替代钢筋提供 钢筋锈蚀是钢筋混凝土结构劣化的主要原因，特别是在 恶劣的环境，如桥梁和停车场。大量的停车场在北部 在美国，建筑采用平板结构，其中平板直接支撑在柱上。在 在这些结构中，双向板柱连接处的横向冲切通常控制着 设计此外，冲剪破坏通常是脆性的，突然的和灾难性的，因此， 当然应该避免。提供锚固良好的横向（剪切）钢筋， 较薄的板（成本低得多），在破坏前有明显的变形（充分的警告）。Pultrall在 开发一种新产品，GFRP螺柱，以加强这种连接的剪切过程。主要问题是 小板厚（200-300 mm），其中充分粘结或锚固的发展是一个挑战。一 建议使用短长度（150-250 mm）双头GFRP钢筋作为剪力钉。当前 对于尺寸13（12.7-mm）的带头棒的生产方法要求每个带头的长度至少为60-70 mm 直径）棒;较大尺寸的棒需要较长的头部。为了开发这样的新产品（棒直径， 相应的头部尺寸和可用应变），它需要全面测试钢筋混凝土板柱连接使用 不同的GFRP剪力钉模式（尺寸，延伸和布置）在柱附近。

Pultrall is a leading Canadian manufacturer of composite materials for various applications including products related to transportation, medical, military and construction industry. One of these applications is the development of non-corrodible, fibre-reinforced polymer (FRP) reinforcing bars for concrete structures using the pultrusion process. These bars have proven to be an excellent alternative for steel reinforcement provided that steel corrosion is the main cause of deterioration of reinforced concrete (RC) structures especially those in harsh environments such as bridges and parking structures. A large number of parking structures in North America are constructed using flat plate structures in which flat slabs are directly supported on columns. In these structures, the transverse punching shear at the two-way slab-column connections usually governs the design. Besides, punching shear failure is usually brittle, sudden and catastrophic in nature and, therefore, it should be certainly avoided. Providing well-anchored transverse (shear) reinforcement results in significantly thinner slabs (much less cost) with significant deformation (ample warning) before failure. Pultrall is in the process of developing a new product, GFRP studs, to reinforce such connections in shear. The main issue is the small slab thickness (200-300 mm) in which the development of adequate bond or anchorage is a challenge. A short length (150-250 mm), double-headed GFRP bars are proposed to be used as shear studs. The current production method for headed bars requires a length of at least 60-70 mm per head for size 13 (12.7-mm diameter) bars; larger size bars require longer heads. To develop such a new product (bar diameter, corresponding head size and usable strain), it requires full-scale testing of RC slab-column connections using different GFRP shear stud patterns (size, extend and arrangement) in the vicinity of the column.