Fibre plastic-steel combination beam

Abstract

The invention belongs to the bridge engineering field, in particular relates to a fiber plastic-steel composite beam, which is composed of a cold-formed sheet and a fiber reinforced plastic (FRP) box beam. The cold-formed sheet is a groove-shaped structure being composed of a crown plate and reinforced ribs connected with ends of the crown plate; the box beam is a box-shaped structure comprising an upper wing edge, a lower wing edge and two side webs connected in every two components. The structure is shown in the diagram; wherein, the crown plate is arranged on top of the upper wing edge of the box beam; the reinforced ribs on both ends are respectively linked to two webs. The lower wing edge of the box beam is composed of glass fiber prepregs and carbon fiber prepregs alternatively laminated with each other; the upper wing edge is laminated with glass fiber prepregs; the web is made of glass fiber prepregs in a congruent mode. The invention fulfills manufacturing with molded techniques and fabricated in a one-through overall formation. The invention has the advantages of high steel beam rigidity, high bearing capacity, perfect anti-corrosion of FRP beams, and low self-weight, and excellent ductility performance, which, therefore, provides a new selection for bridge construction.

Description

technical field [0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a fiber plastic-steel composite beam. Background technique [0002] In bridge engineering, the traditional steel girders are exposed to the environment for a long time, and the steel is easy to corrode, especially when the bridge is in the erosive environment such as seaports and docks, the performance, durability and safety of the structure are often affected by the corrosion of the steel , resulting in major safety hazards. To solve this problem, fiber-reinforced plastic (hereinafter referred to as FRP) profiles can be used to replace traditional steel beams. [0003] FRP profiles are I-shaped, channel-shaped or box-shaped profiles made by mixing fibers and matrix materials in a certain proportion and compounding them through certain processes (such as pultrusion, molding, hand lay-up, etc.). It has good one-way stress performance, light weight, good co...

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Problems solved by technology

Therefore, the failure of all-FRP components often starts from the crushing of FRP materials in the compression zone, which has poor ductility and sudden failure.

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