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Pre-stress applying device for fiber reinforced polymer (FRP) bars outside reinforced concrete slab

A reinforced concrete slab and applying device technology, which is applied in the processing of building materials, construction, building construction, etc., can solve the problems of FRP bar overtension, etc., and achieve the effect of small prestress loss and easy operation

Inactive Publication Date: 2012-12-05
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention provides a method for applying prestress to FRP tendons, but this invention does not involve how to precisely control and apply prestress to FRP tendons during the prestress application process, which may lead to overtension of FRP tendons

Method used

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  • Pre-stress applying device for fiber reinforced polymer (FRP) bars outside reinforced concrete slab
  • Pre-stress applying device for fiber reinforced polymer (FRP) bars outside reinforced concrete slab
  • Pre-stress applying device for fiber reinforced polymer (FRP) bars outside reinforced concrete slab

Examples

Experimental program
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Effect test

Embodiment 1

[0028] like figure 1 , figure 2 As shown in the figure, the prestressing device of the FRP tendon outside the reinforced concrete slab body of this example consists of angle steel 1, bottom anchorage 2, anchor nut 3, connecting bolt 4, tension nut 5, jack 6, force sensor 7, Tensile steel plate 8, concrete slab 9, angle steel anchorage 10, FRP tendon 11, strain gauge 12, data acquisition instrument 13, computer 14, cement mortar leveling layer 15 are connected. Due to the poor shear resistance of FRP tendons, tensioning equipment It should be installed strictly along the axis of the FRP tendon, and the centerlines of all anchoring and tensioning equipment should be on the same plane.

[0029] The anchoring system of this embodiment is composed of angle steel 1 , bottom anchor 2 , anchor nut 3 , connecting bolt 4 , concrete slab 9 , angle steel anchor 10 , and FRP bars 11 . Drill holes with impact drills at the set positions at both ends of the reinforced concrete slab 9, and...

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Abstract

The invention discloses a pre-stress applying device for fiber reinforced polymer (FRP) bars outside a reinforced concrete slab; the device comprises an anchoring system, a loading device which is connected with the anchoring system, and a data acquisition and processing system which is connected with the anchoring system and the loading device; angle steel on both sides is arranged with the holes being in alignment; the FRP bars can be accurately installed at preset positions, so that the deployment directions of the FRP bars are in parallel with the reinforced concrete slab; and anchor devices on the bottom ends of the FRP bars are connected with a tension steel sheet by connecting bolts. Firstly, tensioning force can be enabled to be applied along the centerlines of the FRP bars, so that the shear force which is produced when the FRP bars are eccentrically pulled affects the display of the tensile strength; secondly, the pre-stress is applied to the FRP bars totally, selectively or one by one conveniently by tightening or unscrewing the connecting bolts; and an anchoring bolt is adopted to fasten the FRP bars on the tension end after tensioning, so that the operation is convenient, and the loss of the pre-stress is small.

Description

technical field [0001] The invention relates to the technical field of external prestressing of reinforced concrete slabs in civil engineering, in particular to a prestressing device for FRP tendons outside the reinforced concrete slab. Background technique [0002] Fiber reinforced plastic (Fiber Reinforced Polymer, FRP for short) composite material has been applied in practical engineering due to its advantages of light weight, high strength, non-corrosion and good fatigue resistance. Fiber-reinforced plastic bars (FRP bars) are used as prestressing bars for external prestressing reinforcement of reinforced concrete slabs, which can not only overcome the corrosion problems of traditional steel strands, high-strength steel wires or thick steel bars, but also give full play to external prestressing. reinforcement effect. [0003] FRP bars are composed of fibers and polymer matrix. The tensile strength and elastic modulus of fibers are higher than those of polymer matrix, an...

Claims

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Application Information

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IPC IPC(8): E04G21/12
Inventor 高丹盈祝玉斌汤寄予房栋朱海堂
Owner ZHENGZHOU UNIV
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