A pretensioned prestressed composite beam using frp composite reinforcement and its construction method

Abstract

The invention discloses a pre-tensioned prestressed composite beam adopting FRP composite bars and a construction method thereof, comprising prefabricated part concrete, cast-in-place part concrete and FRP reinforcement cages; the FRP reinforcement cages include lower longitudinal reinforcements using FRP reinforcements , waist reinforcement, upper longitudinal reinforcement and stirrup; the lower longitudinal reinforcement is embedded in the bottom of the prefabricated concrete after stretching, and each lower longitudinal reinforcement is provided with additional ribs and short FRP pipes; each upper longitudinal reinforcement is provided with There are additional ribs and FRP long pipes; the FRP long pipes are set in the mid-span section of the upper longitudinal reinforcement; the FRP pipes are filled with ultra-high performance concrete (UHPC). The invention is suitable for marine environment, the interface strength of FRP bars-aluminum alloy ribs is high, and the goal of long-term sliding control of the interface can be realized; the pretensioning method is used to apply prestress to the lower longitudinal bars to improve the stiffness of the components; High-performance concrete (UHPC) is used to improve the compressive strength and ductility of FRP bars, and through it, the connection of upper longitudinal bars can be realized.

Description

technical field [0001] The invention relates to the field of prefabricated components of prefabricated buildings, in particular to a pretensioned prestressed composite beam using FRP composite bars and a construction method thereof. Background technique [0002] As a coastal country, my country's marine economy is becoming a new growth point for regional economic development and an entry point for regional industrial economic transformation. At present, my country's marine economic industry is in a period of rapid growth, and the industrial structure is developing from a traditional marine industry-based to a combination of the gradual rise of marine high-tech industries and the transformation of traditional marine industries. [0003] To develop the marine economy and build a marine power requires corresponding ocean-oriented infrastructure. For concrete engineering structures facing marine environments, especially open seas, etc., transporting materials such as sand and w...

AI Technical Summary

Problems solved by technology

Under the premise of the same bearing capacity, compared with traditional reinforced concrete members, the deformation of FRP reinforced concrete members is larger and the cracks are relatively wider. The design is often controlled by the limit state of normal use, and the material strength can only be exerted by about 10%, resulting in waste of material resources. serious

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