FRP (Fiber Reinforced Polymer) pipe-recycled concrete-steel pipe double-walled hollow combined member

The invention discloses an FRP (Fiber Reinforced Polymer) pipe-recycled concrete-steel pipe double-walled hollow combined member. The combined member comprises three parts, namely an outer FRP pipe, an inner steel pipe and recycled aggregate concrete arranged between the outer FRP pipe and the inner steel pipe; the combined member improves the compressive strength and the deformability of the recycled aggregate concrete, thereby improving the overall bearing capacity and the ductility of the member, and reducing the adverse impact on the creep of the member; since the recycled aggregate concrete is wrapped with the corrosion resistant FRP pipe, the instability in durability aspect and other defects of the recycled aggregate concrete are overcome; the hollow combined member is an environment-friendly combined member which is favorable in anti-seismic property and mechanical property, light in dead weight, high in durability, wide in applicability, convenient to construct, reasonable in cost, attractive in appearance, and practical, and has a relatively high popularization value.