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...

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