CN104792626B - Tensile stress and FRP tendons endurance quality experimental provision under environment coupled action - Google Patents

Tensile stress and FRP tendons endurance quality experimental provision under environment coupled action Download PDF

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CN104792626B
CN104792626B CN201510190662.4A CN201510190662A CN104792626B CN 104792626 B CN104792626 B CN 104792626B CN 201510190662 A CN201510190662 A CN 201510190662A CN 104792626 B CN104792626 B CN 104792626B
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frp tendons
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stress
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arm
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CN104792626A (en
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孙伟
蒋金洋
王桂玲
武胜萍
王凤娟
王彭生
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Southeast University
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Abstract

The present invention provides FRP tendons endurance quality experimental provision under a kind of tensile stress and environment coupled action, including lower pulling plate (1), positioning plate (7), the upper arm-tie (2) being set between lower pulling plate (1) and positioning plate (7), the universal spherical joint (8) for passing through upper arm-tie (2) and utilization positioning screw cap (4) to be set to 4 pull rods (3) lower pulling plate (1) and positioning plate (7), be threaded bar, fill sample casing (10), glass tube (13), temperature controller (15);Upper arm-tie (2) bottom is equipped with reinforcing nut (5), and spring (6) is equipped between the upper arm-tie (2) and positioning plate (7);Trepanning is respectively equipped in the middle part of the lower pulling plate (1), upper arm-tie (2), the universal spherical joint (8) that a pair is threaded bar is each passed through lower pulling plate (1), the middle part trepanning of upper arm-tie (2) is connect with dress sample casing (10);Strain gauge (9) is equipped between universal spherical joint (8) and lower pulling plate (1), strain gauge (9) is connect with data collector (16);The glass tube (13) connect with temperature controller (15).The device precision is high, and stress level is adjustable, and stress distribution is uniform during being further applied load for a long time, and continuity is good, and temperature is easy to control, and reliability is high.

Description

Tensile stress and FRP tendons endurance quality experimental provision under environment coupled action
Technical field
The present invention relates to FRP tendons durability research field, more particularly to a kind of FRP tendons are made in tensile stress and Environmental coupling With lower multi-factors durability experimental method and device.
Background technology
Reinforced concrete structure is because its is cheap, construction is simple, has excellent performance extensively using civil engineering, building and army Work etc..However, iron and steel resource is limited, and reinforced concrete structure faces reinforcing bar in western salt lake, the South Sea and offshore engineering Corrosion problem seriously affects the service life of concrete structure.Fiber reinforcement polymer bar (Fiber Reinforced Polymer rebars, abbreviation FRP tendons) have the characteristics that tensile strength is high, light, non-conductive, corrosion-resistant, and led as engineering The hot spot of domain research.
The corrosion problem of reinforcing bar is not present in FRP tendons, but since FRP tendons mostly use polymeric matrix, polymer is in high temperature Swelling easily occurs under humidity, ocean salt environment, microbial environment and concrete alkali environment and destroys basal body structure with dissolving, reduces Protection to fiber.In addition, the skeleton structure of common reinforcing material glass fibre is Si-O tetrahedrons, it is easy under strong alkali environment Dissolution and etching phenomenon occurs, and substantially reduces the mechanical property of FRP tendons.Therefore, domestic and foreign scholars start to FRP tendons in humidity Environment, the endurance quality under the environment such as acid, alkali, salt and high temperature are studied.In engineering structure, environment acts on simultaneously with load FRP tendons concrete structure, load can cause FRP tendons surface crack, accelerate the diffusion of ion.However, the existing less consideration of research Loading stress and the influence to FRP tendons endurance quality under environment coupled action, main cause are that the tensile strength of FRP tendons is high, are answered The coupling of power and environment is difficult to realize.There is research to apply load using falling weight under FRP tendons, and single unit system is put into big ring Coupling is realized in the case of border, it is big to reach the weight volume that stress level needs, and stress level is difficult to control under buoyancy, separately Outside, loading device is easily destroyed under corrosive environment, and service life is short, of high cost, and precision is low.
Therefore, developing FRP tendons endurance quality experimental provision under tensile stress and the effect of environment various factors coupling has weight The application value wanted provides the laboratory apparatus of science for FRP tendons Study on Durability, pushes FRP tendons in engineering structure Using foreground is very wide.
Invention content
Goal of the invention:It is an object of the invention to be directed to existing tensile stress and FRP tendons durability under environment coupled action Deficiency in capable of studying provides one kind and is being drawn suitable for research FRP tendons using spring loads, sensor technology and temperature control technology The experimental provision and method of endurance quality under the action of stress is coupled with salt, alkali, high/low temperature are stretched, to the durability to FRP tendons It can carry out accurately testing and evaluating.
Technical solution:For achieving the above object, the present invention provides under a kind of tensile stress and environment coupled action FRP tendons endurance quality experimental provision, including lower pulling plate (1), positioning plate (7), be set between lower pulling plate (1) and positioning plate (7) Upper arm-tie (2), 4 drawings being set to across upper arm-tie (2) and using positioning screw cap (4) lower pulling plate (1) and positioning plate (7) Bar (3), the universal spherical joint (8) for being threaded bar, dress sample casing (10), glass tube (13), temperature controller (15);The pull-up Plate (2) bottom is equipped with reinforcing nut (5), and spring (6) is equipped between the upper arm-tie (2) and positioning plate (7);The lower pulling plate (1), be respectively equipped with trepanning in the middle part of upper arm-tie (2), a pair be threaded bar universal spherical joint (8) be each passed through lower pulling plate (1), The middle part trepanning of upper arm-tie (2) is connect with dress sample casing (10);Stress sensing is equipped between universal spherical joint (8) and lower pulling plate (1) Device (9), strain gauge (9) are connect with data collector (16);The glass tube (13) connect with temperature controller (15).
As an improvement, the temperature-control range of the temperature controller (15) is at -50~99 DEG C.
It is improved as another kind, the glass tube (13) is lucite tube.
It is improved as another kind, 4 pull rods (3) are uniformly distributed.
The present invention also provides a kind of using above-mentioned apparatus to FRP tendons endurance quality under tensile stress and environment coupled action Test method includes the following steps:
(1) FRP tendons sample 12, both ends is taken to be anchored using threaded steel pipe 11, the middle part of FRP tendons sample is set with glass tube 13, bottom is sealed using rubber stopper 14 and epoxide-resin glue;
(2) according to specimen height, adjustment reinforcing nut, upper arm-tie, positioning plate and positioning screw cap relative position, and utilize Level meter controls upper arm-tie and positioning plate level, and the FRP tendons sample anchored is screwed in dress sample casing;
(3) after pouring into simulation etchant solution by the upper end of glass tube, upper port is covered with preservative film;Set temperature controller Temperature;
(4) according to the stress level of setting, slowly rotation reinforces nut to FRP tendons sample application axle center tensile stress, adds Pull-up plate level is kept during power, is changed using strain gauge and the real-time monitor stress of data collector, is loaded onto setting Stress level;A subordinate load is acquired per 15min, when load level declines 5%, adjustment reinforcing nut restores to primitive stress It is horizontal;
(5) after the duration for reaching setting, closing temperature controller, strain gauge, data collector;It unloads and unloads Lotus removes FRP tendons sample;Tensile strength, elasticity modulus and the limit tensile strain of FRP tendons sample are tested using MTS testing machines;
By residual strength f (t, T, a), elasticity modulus loss late e (t, T, a) and residual strain energy H (t, T, a) to FRP The endurance quality that muscle stretches under being acted on environment various factors coupling is evaluated;Wherein, residual strength f (t, T, a), elasticity modulus (t, T, a) (t, T a) are determined by formula (1)-(3) loss late e with residual strain energy H:
Residual strength f (t, T, a), i.e., after tensile stress and environment coupled action the ultimate tensile strength of FRP tendons sample with Compare the ratio of the tensile strength of FRP tendons sample:
The elasticity modulus and comparison FRP of elasticity modulus loss late, i.e. tensile stress and FRP tendons sample after environment coupled action The difference of the elasticity modulus of muscle accounts for the percentage amounts of initial elastic modulus:
Residual strain energy, i.e. tensile stress and the tensile stress strain curve of FRP tendons sample after environment coupled action integrate The integral area of area and the tensile stress-strain curve of comparison FRP tendons sample:
In formula, f (e) is the stress changing curve equation during FRP tendons tensile loads.
Wherein, P0Preceding ultimate tensile strength, E are not corroded for FRP tendons sample0For elasticity modulus, εl0For limit tensile strain; T is set temperature, and a is stress level, the ultimate tensile strength with FRP tendons sample after simulated solution coupling to age t d For Pt,T,a, elasticity modulus Et,T,aIt is ε with limit tensile strainl(t,T,a)
Preferably, the simulation etchant solution is saturated calcium hydroxide solution, strong base solution, salting liquid or saline and alkaline compound molten Liquid.
Advantageous effect:Apparatus of the present invention precision is high, and stress level is adjustable, and stress distribution is equal during being further applied load for a long time Even, continuity is good, and temperature is easy to control, and reliability is high.
Compared with prior art, the invention has the advantages that:
(1) the coaxial stress of test specimen is conducive to the precision for improving test.In order to ensure that applied pulling force stretches for axle center Geometric eccentricity is reduced or eliminated in terms of following two in load, the present invention:1) it uses screw thread seamless steel pipe to anchor FRP tendons, utilizes Linear anchoring auxiliary device ensures the shaft core position at anchoring both ends;2) upper and lower pulling plate and positioning plate pass through level meter controlled level; 3) universal spherical joint there are two being set between upper and lower pulling plate, bias is reduced or eliminated by the rotation of universal spherical joint.
(2) stress level is adjustable, and stress distribution is uniform during being further applied load for a long time.The present invention uses 4 spring loads, Strain gauge is installed between lower flexural pivot and lower pulling plate, is connect with data collecting system, is controlled the stress level of load, is held lotus Real-time monitor stress variation in the process then tightens reinforcing nut and is allowed to restore the original of setting simultaneously once stress loss is more than 5% Beginning stress value overcomes the large volume problem of weight loading device.
(3) etchant solution is detached with loading device, and acquisition precision is high, and reliability, continuity are good, saves the time.Corrosion Solution is fixed on the free segment of FRP tendons sample by lucite tube, not injury experiment loading device, effectively prevents because of solution Loading frame burn into force object caused by effect is influenced and the unstable problem of stress by etchant solution.
(4) temperature is easy to control, and reliability is high.The present invention uses the micro-computer temperature control with refrigeration, heat-production functions The simulated solution temperature of test specimen is impregnated in device control, and temperature range is -50 DEG C~99 DEG C, and control accuracy is high, convenient and reliable, can study Endurance quality under FRP tendons high/low temperature, applicability are good.
Description of the drawings
Fig. 1 is the structural schematic diagram of tensile stress of the present invention and FRP tendons endurance quality experimental provision under environment coupled action.
Fig. 2 is 60 DEG C in the specific embodiment of the invention, under 0.6 stress level and pH=13.68 strong base solution couplings The tensile stress-strain curve of GFRP tendons.
Fig. 3 is 60 DEG C in the specific embodiment of the invention, under 0.6 stress level and pH=13.68 strong base solution couplings Tensile stress-Integrated strain curve of GFRP tendons.
Specific implementation mode
The present invention is further described below in conjunction with the accompanying drawings.
Tensile stress and FRP tendons endurance quality experimental provision under environment coupled action are shown in Fig. 1, including lower pulling plate 1, positioning Plate 7, the upper arm-tie 2 between lower pulling plate 1 and positioning plate 7 are set to lower pulling plate 1 across upper arm-tie 2 and using positioning screw cap 4 4 pull rods 3 between positioning plate 7, the universal spherical joint 8 for being threaded bar, dress sample casing 10, glass tube 13, temperature controller 15;4 pull rods 3 are uniformly distributed;2 bottom of upper arm-tie is equipped with reinforcing nut 5, and spring 6 is equipped between upper arm-tie 2 and positioning plate 7;Under Pulling plate 1, upper arm-tie 2 middle part be respectively equipped with trepanning, the universal spherical joint 8 that a pair is threaded bar is each passed through lower pulling plate 1, pull-up The middle part trepanning of plate 2 is connect with dress sample casing 10;Strain gauge 9, stress sensing are equipped between universal spherical joint 8 and lower pulling plate 1 Device 9 is connect with data collector 16;Glass tube 13 is connect with temperature controller 15, and glass tube 13 is lucite tube;Temperature control The temperature-control range of device 15 processed is at -50~99 DEG C.
FRP tendons endurance quality under tensile stress and environment coupled action is tested using above-mentioned apparatus, is included the following steps:
(1) according to test requirements document, the FRP tendons 12 of a length of 70 times of diameters are intercepted, 2 are used as spare test piece, sample both ends By the threaded seamless steel pipe anchoring of surfaces externally and internally, outer diameter of steel pipes 25mm, thick 3mm, anchorage length is that 15 times of FRP tendons are straight Diameter, steel duct fill epoxide-resin glue, ensure that FRP tendons are in the shaft core position of anchorage using linear anchoring auxiliary device;6 FRP tendons sample is used to test tensile strength, elasticity modulus and the limit tensile strain before corrosion, and in addition 6 FRP tendons are for testing Tensile stress and tensile strength, elasticity modulus and the limit tensile strain after environment coupled action.
(2) lucite tube is sleeved on to middle part (can freely be extended in drawing process one section, the i.e. FRP of FRP tendons sample Muscle both ends are anchored using anchorage, the remaining free segment not anchored), bottom is sealed using rubber stopper and epoxide-resin glue.
(3) according to specimen height, adjustment reinforcing nut, upper arm-tie, positioning plate and upper end positioning screw cap position, and utilize Level meter controls upper arm-tie and positioning plate level, and the FRP tendons sample anchored is screwed in loading and unloading sample casing.
(4) simulation etchant solution is poured by the upper port of glass tube according to test requirements document, upper port, temperature is covered with preservative film Spend the outside of controller fixation and glass tube.Then according to the stress level of setting, slowly rotation reinforcing nut is to FRP tendons sample Apply axle center tensile stress, pull-up plate level is kept in afterburner process, the real-time monitor stress of acquisition system of strain gauge Variation, is loaded onto the stress level of setting.A subordinate load is acquired per 15min by acquisition system, when load level declines 5% When, adjustment reinforcing nut restores to primitive stress level.
(5) reach the requirement of experiment duration, then closing temperature controller, strain gauge data collecting system is shed Load removes FRP tendons sample.
Test tensile strength, elasticity modulus and the limit of stress level of the same race and the lower 6 FRP tendons samples of environment coupled action Elongation strain, guarantee have 5 valid data.By residual strength, elasticity modulus loss late and residual strain energy stretch FRP tendons Endurance quality under being acted on environment various factors coupling is evaluated, and is defined as follows:
Residual strength f (t, T, a):Tensile stress and the ultimate tensile strength of FRP tendons sample after environment coupled action with it is right Than the ratio of the tensile strength of FRP tendons sample.
In formula, Pt,T,aIt is a for stress level, temperature is flat for the tensile strength of FRP tendons after immersion t d in the simulated solution of T Mean value;P0To compare the tensile strength average value of FRP tendons.
Elasticity modulus loss late:The elasticity modulus and comparison FRP tendons of tensile stress and FRP tendons sample after environment coupled action The difference of elasticity modulus account for the percentage amounts of initial elastic modulus.
In formula, Et,T,aIt is a for stress level, temperature is flat for the elasticity modulus of FRP tendons after immersion t d in the simulated solution of T Mean value;E0To compare the elasticity modulus average value of FRP tendons.
Residual strain energy:Tensile stress and the tensile stress strain curve of FRP tendons sample after environment coupled action integrate face The integral area of product and the tensile stress-strain curve of comparison FRP tendons sample.
In formula, f (e) is stress-change curve equation during FRP tendons tensile loads;el(t,T,a)It is for stress level A impregnates the limit tensile strain of FRP tendons after t d in the simulated solution that temperature is T;el0To compare the ultimate elongation of FRP tendons sample Strain.
Below to 60 DEG C of temperature, the durability of GFRP tendons under stress level 0.6, pH=13.68 strong base solution couplings It can be tested:
The present embodiment muscle uses 100 glass fiber reinforced polymers of Aslan (GFRP) muscle, and matrix is vinyl ester resin, Volume fraction is about 30%, and reinforcing material is E-glass fibers, and volume fraction is about 70%, a diameter of 10mm.Simulation corrosion is molten Liquid is the strong base solution of pH=13.68, and solution composition is as shown in table 1.
1 simulated solution of table forms (unit:g/L)
In the present embodiment, a length of 700mm of FRP tendons sample often holds anchorage length for 150mm, freedom length 400mm, Stress level is 0.6.According to rod length, spring rate, dress sample casing diameter, FRP tendons specimen length L be 500~1500mm, 6~16mm of diameter, tensile load are that the purpose of the present invention may be implemented in 10~80kN.
The GFRP tendons sample that 12 root longs are 700mm is intercepted, by sample both ends by the threaded seamless steel pipe anchor of surfaces externally and internally Gu outer diameter of steel pipes 25mm, thick 3mm, anchorage length 150mm, steel duct fills epoxide-resin glue, auxiliary using linearly anchoring Device is helped to ensure that GFRP tendons are in the shaft core position of anchorage.After last one end glue pours into 72h, wherein 6 GFRP tendons MTS 810 experimental machines are with reference to GB/T 228.1-2010《Metal material stretching test first part:Room temperature test method》Stretch strong Degree test acquires stretching initial stage dependent variable using extensometer, for calculating elasticity modulus and correcting limit tensile strain, ensures have Otherwise 5 effective fracture tensile strength data increase sample quantities and continue to test.
According to the GFRP tendons tensile strength measured, test device and experimental method using the present invention apply 0.6 to test specimen Stress level (tensile stress/ultimate tensile strength of application), has strain gauge to monitor in real time, once answering during holding lotus Power is lost more than 5%, then adjusts reinforcing nut and restore to primitive stress value.It is 60 DEG C to control environment temperature, by pH=13.68's Simulated solution pours into lucite tube.Duration of test runs is 30d, removes infuser device, unloads tensile load, removes sample, Then use 810 experimental machines of MTS with reference to GB/T 228.1-2010《Metal material stretching test first part:Room temperature test method》 Tensile strength test is carried out, stretching initial stage dependent variable is acquired using extensometer, for calculating elasticity modulus and correcting ultimate elongation Strain, guarantee have 5 effective fracture tensile strength data, otherwise increase sample quantities and continue to test.
Measure ultimate tensile strength, elasticity modulus and the ultimate elongation of stress and the GFRP tendons sample after environment coupled action Strain, using residual strength, elasticity modulus loss late and residual strain energy are under FRP tendons stretching-environment various factors coupling effect Endurance quality evaluated, as shown in table 2, Fig. 2 and Fig. 3.
2 stress of table and GFRP tendons endurance quality after environment coupled action

Claims (2)

1. a kind of to FRP tendons endurance performance testing method under tensile stress and environment coupled action, it is characterised in that:Including stretching Stress includes lower pulling plate (1), positioning plate (7), is set to FRP tendons endurance quality experimental provision under environment coupled action, the device Upper arm-tie (2) between lower pulling plate (1) and positioning plate (7) passes through upper arm-tie (2) and is set to drop-down using positioning screw cap (4) 4 pull rods (3) between plate (1) and positioning plate (7), the universal spherical joint (8) for being threaded bar, dress sample casing (10), glass tube (13), temperature controller (15);Upper arm-tie (2) bottom is equipped with reinforcing nut (5), the upper arm-tie (2) and positioning plate (7) Between be equipped with spring (6);Trepanning is respectively equipped in the middle part of the lower pulling plate (1), upper arm-tie (2), a pair is threaded the ten thousand of bar To flexural pivot (8) is each passed through lower pulling plate (1), the middle part trepanning of upper arm-tie (2) is connect with dress sample casing (10);Universal spherical joint (8) Strain gauge (9) is equipped between lower pulling plate (1), strain gauge (9) is connect with data collector (16);
Tensile stress and FRP tendons endurance performance testing method under environment coupled action are included the following steps:
(1) FRP tendons sample, both ends is taken to be anchored using threaded steel pipe, the middle part suit glass tube of FRP tendons sample, bottom utilize Rubber stopper and epoxide-resin glue sealing;
(2) according to specimen height, adjustment reinforcing nut, upper arm-tie, positioning plate and positioning screw cap relative position, and using horizontal The FRP tendons sample anchored is screwed in dress sample casing by instrument control upper arm-tie and positioning plate level;
(3) after pouring into simulation etchant solution by the upper end of glass tube, upper port is covered with preservative film;Set temperature controller temperature Degree;
(4) according to the stress level of setting, slowly rotation reinforces nut to FRP tendons sample application axle center tensile stress, reinforced Pull-up plate level is kept in journey, is changed using strain gauge and the real-time monitor stress of data collector, is loaded onto answering for setting Power is horizontal;A subordinate load is acquired per 15min, when load level declines 5%, adjustment reinforcing nut restores to primitive stress water It is flat;
(5) after the duration for reaching setting, closing temperature controller, strain gauge, data collector;Load is shed, is taken Lower FRP tendons sample;Tensile strength, elasticity modulus and the limit tensile strain of FRP tendons sample are tested using MTS testing machines;
By residual strength f, (t, T, a), (t, T, a) (t, T a) draw FRP tendons elasticity modulus loss late e with residual strain energy H The endurance quality stretched under being acted on environment various factors coupling is evaluated;Wherein, residual strength f (t, T, a), elasticity modulus loss (t, T, a) (t, T a) are determined by formula (1)-(3) rate e with residual strain energy H:
Residual strength f (t, T, a), i.e., the ultimate tensile strength of FRP tendons sample and comparison after tensile stress and environment coupled action The ratio of the tensile strength of FRP tendons sample:
The elasticity modulus and comparison FRP tendons of elasticity modulus loss late, i.e. tensile stress and FRP tendons sample after environment coupled action The difference of elasticity modulus accounts for the percentage amounts of initial elastic modulus:
The tensile stress strain curve integral area of residual strain energy, i.e. tensile stress and FRP tendons sample after environment coupled action With the integral area of the tensile stress-strain curve of comparison FRP tendons sample:
In formula, f (ε) is the stress changing curve equation during FRP tendons tensile loads;
Wherein, P0Preceding ultimate tensile strength, E are not corroded for FRP tendons sample0For elasticity modulus, ε10For limit tensile strain;T is to set Constant temperature degree, a are stress level, and the ultimate tensile strength with FRP tendons sample after simulated solution coupling to age td is Pt,T,a, Elasticity modulus is Et,T,aIt is ε with limit tensile strainl(t,T,a)
2. it is according to claim 1 to FRP tendons endurance performance testing method under tensile stress and environment coupled action, it is special Sign is:Simulation etchant solution is saturated calcium hydroxide solution, salting liquid or saline and alkaline composite solution.
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