Punching Shear Behaviour of FRP-Reinforced Concrete Slab-Column Connections

使用不腐蚀的纤维增强聚合物（FRP）钢筋来加固在恶劣环境下建造的混凝土结构，如桥梁和停车场，有利于避免昂贵的钢腐蚀问题。在北美，大量的停车结构和工业建筑采用平板系统，其中混凝土板直接支撑在柱上。在这种结构体系中，最关键的是板柱连接，这里的冲切应力最大。冲剪破坏通常是脆性、突发性和灾难性的，应尽量避免。由于FRP筋在低刚度和抗压强度降低的情况下仍具有线弹性行为，因此当使用FRP筋时，人们担心这些节点的延性、抗剪能力和完整性，特别是在地震荷载下。关于这个主题的数据非常有限，甚至没有。

The use of the non-corrodible fibre reinforced polymer (FRP) bars to reinforce concrete structures built in harsh environments, such as bridges and parking garages is beneficial to avoid the costly steel-corrosion problems. In North America, a large number of parking structures and industrial buildings is constructed using flat plate system in which concrete slabs are directly supported on columns. The most critical element in such structural system is the slab-column connection where punching shear stresses are the largest. Punching shear failures are usually brittle, sudden and catastrophic in nature and should be avoided. Since FRP bars have linear-elastic behaviour till failure with low stiffness and reduced compressive strength, there are concerns regarding the ductility performance, shear capacity and the integrity of such joints when FRP bars are used, especially under seismic loads. Very limited to no data is available on that topic.