Abstract: In order to further improve the performance of FRP pipe and reduce the cost, fiberglass hollow sandwich pipe was designed. Compared with traditional fiberglass pipe, the new fiberglass hollow sandwich pipe has many advantages, such as light weight, low cost, and good impact resistance under the same ring stiffness. The strength and ring stiffness of the hollow sandwich pipe were analyzed using the theory of mechanics of materials and composite materials. The Euler formula was used to analyze the stability of the core material. At the same time, ANSYS software was used to establish the finite element model of the pipe ring and cell unit, and the strength, ring stiffness and core material stability of the pipe were analyzed. The results of the theoretical calculation and the finite element analysis are in close agreement, which verify the reliability of the theoretical calculation methods of strength, ring stiffness and stability.

Key words: fiberglass pipe, hollow sandwich, strength, ring stiffness, stability