CN103541513B

CN103541513B - Edge FRP muscle reinforced concrete anchoring piece in a kind of

Info

Publication number: CN103541513B
Application number: CN201310431077.XA
Authority: CN
Inventors: 张延年
Original assignee: Shenyang Jianzhu University
Current assignee: Shenyang Jianzhu University
Priority date: 2013-09-22
Filing date: 2013-09-22
Publication date: 2016-04-20
Anticipated expiration: 2033-09-22
Also published as: CN103541513A

Abstract

This invention provides a kind of interior edge FRP muscle reinforced concrete anchoring piece, solving the problem of FRP muscle anchoring effect, forming by wearing muscle pipe, vertical linkage muscle, lateral ties muscle, anchor rib and FRP muscle etc. by simple way.4 rectangular distributions of anchor rib, two minor faces of rectangle are connected by two vertical linkage muscle; The side on two long limits of rectangle is connected by lateral ties muscle, and side connects by wearing muscle pipe.Anchor rib free end adopts bolt to fix.Wearing muscle pipe is curve-like, is less than 45 degree of arcs.Effect of the present invention and advantage are simple, economical and anchoring effect is good.

Description

Edge FRP muscle reinforced concrete anchoring piece in a kind of

Technical field

The present invention relates to the novel anchoring piece in a kind of technical field of buildings, particularly relate to a kind of interior edge FRP muscle reinforced concrete anchoring piece.

Background technology

Fiber-reinforced polymer (FRP) application in civil engineering is divided into two large classes, and a class replaces reinforcing bar for newly-built structure with FRP muscle, and another kind of is maintenance network FRP muscle being used for old structure thing.The current research about the rib prestressed reinforced concrete structure of FRP is subject to the most attention of research institution of various countries and engineering circles.The case history of FRP muscle reinforcement bridge is increasing.The present invention summarizes the domestic and international newest research results about FRP material, has made prospect to the development in FRP material future.

In current prestressing force and underground pile foundation structure, the etching problem of reinforcing bar is serious.It is found that use corrosion resistant FRP material to replace the feature such as high-tensile that reinforcing bar is the essence method addressed this problem, particularly FRP material and corrosion resistance makes it become the ideal material of prestressed structure.FRP material is used in many engineerings, but it is slightly poor relative to reinforcing bar with concrete adhesive property, and FRP material is fragile material, cause the security performance of FRP concrete structure to reduce, therefore utilize the most basic problem of FRP muscle replacement reinforcing bar to be always to solve ductility and the endurance issues of FRP and concrete adhesive property and FRP concrete structure.

Destruction due to FRP is fragility, and the research of the crooked deformability of FRP concrete structure seems particularly important.The people such as the Janet.M.Lees of Britain have studied aramid fiber muscle and concrete bonds entirely, do not bond and part adhesive 3 kinds of bonding modes mix the impact of beam deformed ability to aramid fiber muscle and concrete binding power and aramid fiber muscle.Part adhesive is divided into two kinds of forms in test: one is interval bonding, and fiber bar bonds in beam longitudinal axis and concrete interval; Two is absorption bondings, is coated with one deck resin, controls fiber bar and concrete adhesion stress by face coat on the surface of fiber bar.

Test proves, the ultimate bearing capacity of the aramid fiber Concrete Beam Reinforced that 1. entirely bonds is very high, and extreme flexion distortion is less, and the destruction of beam is pulled off by fiber bar to cause; 2. the ultimate bearing capacity that the aramid fiber muscle that do not bond mixes beam is lower, only has a crack to produce during destruction, but extreme flexion distortion is very large, and the destruction of beam is because concrete is crushed; 3. part adhesive aramid fiber Concrete Beam Reinforced shows higher ultimate bearing capacity and the distortion of larger extreme flexion, and the destruction of beam is because fiber bar is pulled off.Beam crack when destroying is more, avoids concrete crushed, and the ultimate bearing capacity of particularly absorption bonding and spiral wound spacer bonding aramid fiber Concrete Beam Reinforced reaches the ultimate bearing capacity of full bonding aramid fiber Concrete Beam Reinforced.This shows that part adhesive can optimize ultimate bearing capacity and the crooked deformability of the rib prestressed concrete beam of FRP.

Part adhesive fiber bar prestressed concrete beam shows good mechanical property and ductility, but two kinds of part adhesive construction complexity, the technical difficulty of more than test are high, should not promote the use of, therefore seeking easy part adhesive mode is following developing direction, needs the destruction characteristic of further study portion viscose fibre Concrete Beam Reinforced and cutting performance etc. simultaneously.

For most of old concrete structure, particularly bridge, parking lot and some memorable buildings etc., due to the change of using function, the raising of structural requirement, the time limit of service life, the reasons such as the defect in former design and structure damage in use, simultaneously in order to reach the principle of economic optimization, need to repair old mixed structure and reinforce.A method of effectively repairing and reinforce carries out external prestress reinforcing to works exactly.Externally reinforced have easy construction and be convenient to the advantage of monitoring outside muscle.Outside muscle all adopted reinforcing bar in the past, because it has good ductility, but due to exposed in appearance, easily corroded, needed long-term maintenance, economical not.Nearest people often adopt FRP muscle as outside muscle.To the greatest extent let it be, and ductility is poor, and modulus of elasticity is lower, but it has that intensity is high, quality is light and the advantage such as corrosion-resistant.The stress less (ultimate bearing capacity far below fiber bar) that outside muscle bears when outside prestressed reinforcement, and low elasticity mould has and in reduction loss of prestress, therefore utilizes FRP muscle to carry out to old structure thing the developing direction that external prestress reinforcing is structural strengthening.

Ground tackle has prestressed key issue.Carry out external prestress reinforcing for employing fiber bar to structure, anchoring property directly affects the consolidation effect to beam.Domestic and international many experts and scholars conduct in-depth research this problem.The fiber bar of general broken line arrangement form is anchored at the two ends of beam.One end is fixed, and the other end is moveable hinge, at movable end jack to fiber bar Shi Hanzhang.Current ground tackle form has: 1. ground tackle is wedge shape steel hinge, and wedge shape cuts with scissors direct stretch-draw and anchoring fiber muscle, and this ground tackle can stretch-draw fiber bar effectively; 2. because the surface of fiber bar is more fragile and side direction anti-pressure ability is poor, easily make fiber bar produce lateral compression when adopting wedge shape steel to cut with scissors direct anchoring fiber bar and destroy.The people such as Canada Raafat.El-Hacha improve wedge shape steel hinge, and they have added a wedge metal mold between wedge shape steel hinge and fiber bar, add a mold, and add two molds at jack loading end at fixed end.Test shows that it can reduce the damage of hinge to fiber bar effectively; 3. when ground tackle adopts wedge shape steel to cut with scissors, also easily generation stress is concentrated destroys in wedge-like tip with fiber bar, and the Houssam.Toutany of the U.S. improves this shortcoming, utilizes polyamide to replace steel to make wedge shape and cuts with scissors, got good effect.Although the anchoring of outmost fiber muscle has reached the stage of a relative maturity, need to reduce hinge further to the damage of fiber bar and the contact surface performance optimizing hinge and fiber bar.

In addition, often there is fastening destruction in interior edge FRP muscle reinforced concrete, FRP muscle cannot play its superior stress performance.Therefore, in order to ensure that interior edge FRP muscle has good anchoring property, be necessary to develop the good anchoring piece of anchoring property.

Summary of the invention

The object of the present invention is to provide a kind of in edge FRP muscle reinforced concrete anchoring piece, mainly for when ensureing interior edge FRP muscle reinforced concrete, FRP muscle has good anchoring property, and then guarantee FRP muscle plays its good stress performance.

The object of the invention is to be achieved through the following technical solutions:

Interior edge FRP muscle reinforced concrete anchoring piece forms by wearing muscle pipe, vertical linkage muscle, lateral ties muscle, anchor rib and FRP muscle, and it is characterized in that: 4 rectangular distributions of anchor rib, two minor faces of rectangle are connected by two vertical linkage muscle; The side on two long limits of rectangle is connected by lateral ties muscle, and side connects by wearing muscle pipe.Bolt is adopted to fix at anchor rib free end.Wearing muscle pipe is curve-like, is less than 45 degree of arcs.

Advantage of the present invention and beneficial effect:

In the present invention, the investigation and application of FRP muscle as described in the background art, and achievement a lot, but does not also have successful and simple and effective anchoring piece, and the anchoring effect of concrete anchor is very important to the application of FRP muscle.Effect of the present invention and advantage are simple, economical and anchoring effect is good.Wearing muscle pipe in invention is curve-like, better through test effect.

Accompanying drawing explanation

Fig. 1 is the floor map of interior edge FRP muscle reinforced concrete anchoring piece;

Fig. 2 is the left view of interior edge FRP muscle reinforced concrete anchoring piece Fig. 1;

Fig. 3 is the elevation of Fig. 1 of interior edge FRP muscle reinforced concrete anchoring piece;

Using state schematic diagram when Fig. 4 is the reinforcing of interior edge FRP muscle reinforced concrete anchoring piece.

In figure, 1 for wearing muscle pipe; 2 is vertical linkage muscle; 3 is lateral ties muscle; 4 is anchor rib; 5 is nut; 6 is FRP muscle; 7 is beam; 8 is post.

Detailed description of the invention

Below in conjunction with technical scheme with reference to accompanying drawing, the present invention is described in detail.

The interior edge FRP muscle reinforced concrete anchoring piece that the present invention proposes is as shown in Fig. 1 ~ Fig. 4.

Whole device is primarily of wearing the compositions such as muscle pipe 1, vertical linkage muscle 2, lateral ties muscle 3, anchor rib 4, bolt 5, FRP muscle 6, beam 7 and post 8.

Make as requested and wear muscle pipe 1, vertical linkage muscle 2, lateral ties muscle 3, anchor rib 4 etc., and welded.4 rectangular distributions of anchor rib 4, two minor faces of rectangle are connected by two vertical linkage muscle 2; The side on two long limits of rectangle is connected by lateral ties muscle 4, and side connects by wearing muscle pipe 1.Bolt 5 is adopted to fix at anchor rib 4 free end.Wear muscle pipe 1 for curve-like, be less than 45 degree of arcs.In using, between two beams 8, be fixed on beam 7 with bolt 5 by interior edge FRP muscle reinforced concrete anchoring piece free end, FRP muscle 6, through wearing muscle pipe 1, owing to wearing muscle pipe 1 for curve-like, is conducive to certain distortion.

Claims

1. inlay FRP muscle reinforced concrete anchoring piece in one kind, comprise and wear muscle pipe (1), vertical linkage muscle (2), lateral ties muscle (3), anchor rib (4) and FRP muscle (6), the rectangular distribution of 4 anchor ribs (4), two minor faces of rectangle are connected by two vertical linkage muscle (2); The side on two long limits of rectangle is connected by lateral ties muscle (3), and opposite side connects by wearing muscle pipe (1), it is characterized in that: wearing muscle pipe (1) is curve-like, is less than 45 degree of arcs.

2. edge FRP muscle reinforced concrete anchoring piece in one according to claim 1, is characterized in that: anchor rib (4) free end adopts bolt (5) to fix.