High shear strength post-forming FRP profiles: manufacture and testing
Zou Xingxing1,2 Chen Jun1,2 Jiang Hui3 Wang Jingquan1,2
1. Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast University, Nanjing 210096,
China;
2. National Engineering Research Center for Prestressing, Southeast University, Nanjing 210096, China;
3. Xuzhou Institute of Technology, Xuzhou221018, China
Abstract：The unidirectionally reinforced fibers in FRP pultruded profiles may lead to the low shear strength and the phenonenon that shear failure in the longitudinal direction may readily occur at webs. To overcome the shortcomings described above, a post-forming process for FRP profiles was proposed, in which a multi-directional hand lay-up interlayer was added between two pultruded FRP webs. Direct shear tests on 20 specimens revealed that the web shear strength of post-forming profiles was improved substantially over the pultruded profiles, and shear stresses was redistributed after a higher level to avoid brittle failure mode. As a result, based on the characteristics of the post-forming process, a simplified calculation method for stiffness and strength was derived based on laminated plate theory.
