CN103698267B - The apparatus and method of research steel pipe the concrete flexure member performance under load with corrosion - Google Patents
The apparatus and method of research steel pipe the concrete flexure member performance under load with corrosion Download PDFInfo
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- CN103698267B CN103698267B CN201310750252.1A CN201310750252A CN103698267B CN 103698267 B CN103698267 B CN 103698267B CN 201310750252 A CN201310750252 A CN 201310750252A CN 103698267 B CN103698267 B CN 103698267B
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Abstract
Study apparatus and method for steel pipe the concrete flexure member performance under load with corrosion, belong to Structural Engineering field.This test unit by charger, corrosion device and measurement mechanism three part form, wherein charger mainly comprises lifting jack, large (little) bearing, pull bar (containing nut), distribution beam, loading beam and reaction beam etc.; Corrosion device mainly comprises etching tank, upper cathodic plate, corrosive liquid, insulation course and external power supply etc.; Measurement mechanism mainly comprises load transducer and mechanical type clock gauge and tablet and connecting link etc.The present invention can realize action of long-term load to steel pipe concrete flexural member and galvanic corrosion effect simultaneously; Adopt galvanic corrosion, corrosion speed, higher than natural environment corrosion, can accelerate test progress; By initial loading stage, galvanic corrosion/long-term load phase and destruction load phase, gained test figure can draw out the stressed the Complete Curve of moment of flexure-mid-span deflection of steel pipe concrete flexural member.
Description
Technical field
The invention belongs to Structural Engineering field, particularly a kind of apparatus and method studying steel pipe the concrete flexure member performance under load with corrosion.
Background technology
Steel pipe concrete belongs to the one of unitized construction, refers to and in steel pipe, fills concrete and the jointly stressed and structure that formed of bi-material.Solid steel pipe concrete, hollow sandwich steel pipe concrete and centrifugal steel pipe concrete etc. can be divided into by the layout of steel pipe; Circle, side/rectangle, polygon and chapped pipe concrete etc. can be divided into by section form.Steel pipe concrete often bears larger load in Practical Project, also will be subject to the corrosive attack of corrosive liquids or gas etc. in surrounding environment simultaneously, and the problems referred to above can not be ignored in engineering design with application, are necessary to study.
Have for the test unit of steel pipe concrete flexural member performance study under long duration load and method or for the test unit of steel pipe concrete flexural member electrochemical corrosion resistant performance study and method, but above-mentioned test unit and method can only realize a kind of acting on.
Summary of the invention
In order to study the stress performance of steel pipe the concrete flexure member under axle power and corrosion acting in conjunction, corresponding test unit and method must be related to, the present invention proposes a kind of test unit for steel pipe concrete flexural member electrochemical corrosion resistant performance study under long duration load and method, the action of long-term load to steel pipe concrete flexural member and galvanic corrosion effect can be realized simultaneously.
A kind of device studying steel pipe the concrete flexure member performance under load with corrosion, by charger, corrosion device and measurement mechanism three part form, wherein charger mainly comprises lifting jack, large (little) bearing, pull bar (containing nut), distribution beam, loading beam and reaction beam etc.; Corrosion device mainly comprises etching tank, upper cathodic plate, corrosive liquid, insulation course and external direct current power supply etc.; Measurement mechanism mainly comprises load transducer and mechanical type clock gauge and tablet and connecting link etc.Steel pipe concrete flexural member is placed in the etching tank of corrosion device, and on steel pipe concrete flexural member, places charger simultaneously, is measured steel pipe concrete flexural member action of long-term load and galvanic corrosion effect by measurement mechanism.
Described two large bearings and two pull bars are fixed on ground, and steel etching tank is placed on two large bearings; Base plate in steel etching tank places two little bearings of freely-supported, between the base plate of steel etching tank and the little bearing of freely-supported, insulation course is set;
Placing steel tubes the concrete flexure member on two little bearings of freely-supported, steel pipe concrete flexural member places two little bearings of distribution beam, between steel pipe concrete flexural member and two little bearings of distribution beam, arranges insulation course;
Distribution beam placed by two little bearings of distribution beam, then in distribution beam, places load transducer; Loading beam to be placed on load transducer through two pull bars and to be fixed by nut; Loading beam places lifting jack, then reaction beam to be placed on lifting jack through two pull bars and to be fixed by nut;
Mechanical type clock gauge is placed on the tablet on the Bending moment axis being welded on steel pipe concrete flexural member in advance respectively; Mid-span deflection and support settlement is measured respectively with mechanical type clock gauge;
With steel etching tank and the another upper cathodic plate arranged for negative electrode, with the steel pipe of steel pipe concrete flexural member for anode, external direct current power supply corrodes.
The exposed parts of the little bearing of described freely-supported needs insulation processing, and the exposed parts of the little bearing of distribution beam needs insulation processing, and the connecting link between steel pipe concrete flexural member and tablet needs insulation processing.
Study a method for steel pipe the concrete flexure member performance under load with corrosion, adopt the device of above-mentioned research steel pipe the concrete flexure member performance under load with corrosion, carry out according to following steps:
(1) original upload, the amount of deflection of record load and correspondence thereof and support settlement;
(2) keep original upload value constant, in etching tank, inject corrosive liquid, external direct current power supply starts corrosion, the amount of deflection of record load and correspondence thereof and support settlement;
(3) remove etching tank, keep long-term loaded value constant, disposable destruction loads, the amount of deflection of record load and correspondence thereof and support settlement.
The present invention adopts specific charger and method, and by initial loading stage, galvanic corrosion/long-term load phase and destruction load phase, gained test figure can draw out the stressed the Complete Curve of moment of flexure-mid-span deflection of steel pipe concrete flexural member.Both be applicable to solid steel pipe concrete, hollow sandwich steel pipe concrete and centrifugal steel pipe concrete etc., be also applicable to circle, side/rectangle, polygon and chapped pipe concrete etc.
Advantage of the present invention and effect are:
1. the present invention can realize action of long-term load to steel pipe concrete flexural member and galvanic corrosion effect simultaneously.
2. the present invention adopts galvanic corrosion, and corrosion speed, higher than natural environment corrosion, can accelerate test progress.
3. gained test figure of the present invention can draw out the stressed the Complete Curve of moment of flexure-mid-span deflection of steel pipe concrete flexural member.
Accompanying drawing explanation
Fig. 1 is the test unit front view of solid steel pipe the concrete flexure member electrochemical corrosion resistant performance study under long duration load;
Fig. 2 is the test unit side view of solid steel pipe the concrete flexure member electrochemical corrosion resistant performance study under long duration load;
The test unit schematic diagram of Fig. 3 for using at initial loading stage;
The test unit schematic diagram of Fig. 4 for using in destruction load phase;
In upper figure: 1 large bearing, 2 pull bars, 3 steel etching tanks, 4 little bearings, 5 insulation courses, 6 steel pipe concrete flexural members, 7 end plates, the little bearing of 8 distribution beam, 9 distribution beam, 10 load transducers, 11 loading beams, 12 nuts, 13 lifting jack, 14 reaction beams, 15 mechanical type clock gauges, 16 tablets, 17 connecting links, 18 corrosive liquids, 19 upper cathodic plates, 20 external direct current power supplies.
The test unit pictorial diagram that Fig. 5 uses for galvanic corrosion/long-term load phase;
Fig. 6 is one party cross section solid steel pipe the concrete flexure member moment of flexure (M)-mid-span deflection (u
m) stressed the Complete Curve.
Embodiment
A kind of device studying steel pipe the concrete flexure member performance under load with corrosion, as Figure 1-4, by charger, corrosion device and measurement mechanism three part form, wherein charger mainly comprises lifting jack 13, large bearing 1 and little bearing 4, pull bar 2 (containing nut 12), distribution beam 9, loading beam 11 and reaction beam 14; Corrosion device mainly comprises etching tank 3, upper cathodic plate 19, corrosive liquid 18, insulation course 5 and external direct current power supply 20; Measurement mechanism mainly comprises load transducer 10 and mechanical type clock gauge 15 and tablet 16 and connecting link 17; Steel pipe concrete flexural member 6 is placed in the etching tank 3 of corrosion device, and on steel pipe concrete flexural member, places charger simultaneously, is measured steel pipe concrete flexural member action of long-term load and galvanic corrosion effect by measurement mechanism.
Described two large bearings 1 and two pull bars 2 are fixed on ground, and steel etching tank 3 is placed on two large bearings 1; Base plate in steel etching tank 3 places two little bearings 4 of freely-supported; Between the base plate of steel etching tank 3 and the little bearing 4 of freely-supported, insulation course 5 is set;
Placing steel tubes the concrete flexure member 6 on two little bearings 4 of freely-supported, steel pipe concrete flexural member 6 places two little bearings 8 of distribution beam, between steel pipe concrete flexural member 6 and two little bearings 8 of distribution beam, arranges insulation course 5;
Distribution beam 9 placed by two little bearings 8 of distribution beam, then in distribution beam 9, places load transducer 10; Loading beam 11 to be placed on load transducer 10 through two pull bars 2 and to be fixed by nut 12; Loading beam 11 is placed lifting jack 13, then reaction beam 14 to be placed on lifting jack 13 through two pull bars 2 and to be fixed by nut 12;
Mechanical type clock gauge 15 is placed on the tablet 16 on the Bending moment axis being welded on steel pipe concrete flexural member 6 in advance respectively; Mid-span deflection and support settlement is measured respectively with mechanical type clock gauge 15;
With steel etching tank 3 and the another upper cathodic plate 19 arranged for negative electrode, with the steel pipe of steel pipe concrete flexural member 6 for anode, external direct current power supply 20 starts corrosion.
The exposed parts insulation processing of the little bearing 4 of described freely-supported, the exposed parts also insulation processing of the little bearing 8 of distribution beam, the connecting link 17 also insulation processing between steel pipe concrete flexural member 6 and tablet 16.
Study a method for steel pipe the concrete flexure member performance under load with corrosion, adopt the device of above-mentioned research steel pipe the concrete flexure member performance under load with corrosion, carry out according to following steps:
(1) original upload, the amount of deflection of record load and correspondence thereof and support settlement;
(2) keep original upload value constant, in etching tank, inject corrosive liquid, external direct current power supply starts corrosion, the amount of deflection of record load and correspondence thereof and support settlement;
(3) remove etching tank, keep long-term loaded value constant, disposable destruction loads, the amount of deflection of record load and correspondence thereof and support settlement.
When the device of use research steel pipe concrete flexural member performance under load with corrosion is measured, point following three phases:
Initial loading stage: as shown in Figure 3, first fixes two large bearings 1 and two pull bars 2, then on two large bearings 1, places steel etching tank 3; The base plate of steel etching tank 3 places two little bearings 4 of freely-supported, insulation course 5 is set on the base plate of steel etching tank 3 and between the little bearing 4 of freely-supported, the exposed parts also insulation processing of the little bearing 4 of freely-supported; Placing steel tubes the concrete flexure member 6 on two little bearings 4 of freely-supported, the exposed parts also insulation processing of the end plate 7 of steel pipe concrete flexural member 6; Steel pipe concrete flexural member 6 places two little bearings 8 of distribution beam, insulation course 5 is set between steel pipe concrete flexural member 6 and two little bearings 8 of distribution beam, the exposed parts also insulation processing of the little bearing 8 of distribution beam; The enough large distribution beam of rigidity 9 placed by two little bearings of distribution beam 8, then in distribution beam 9, places load transducer 10; Loading beam 11 is placed on load transducer 10 through two pull bars 2, nut 12 of then screwing on respectively on two pull bars 2; Loading beam 11 is placed lifting jack 13, then reaction beam 14 is placed on lifting jack 13 through two pull bars 2, then tightening nut 12; Mid-span deflection and support settlement is measured respectively with two mechanical type clock gauges 15, the pointer of clock gauge 15 is placed on the tablet 16 on the Bending moment axis being welded on steel pipe concrete flexural member 6 in advance respectively, the connecting link 17 also insulation processing between steel pipe concrete flexural member 6 and tablet 16; Load with lifting jack 13 until reach design load, record amount of deflection and the support settlement of every grade of load and correspondence thereof simultaneously.
Galvanic corrosion/long-term load phase: as depicted in figs. 1 and 2, fastening nut 12, until the load of lifting jack 13 is completely replaced, removes lifting jack 13.Keep original upload value constant, corrosive liquid 18 is injected in etching tank, liquid level should higher than the upper surface of steel pipe concrete flexural member 6, with steel etching tank 3 and the another upper cathodic plate 19 arranged for negative electrode, with the steel pipe of steel pipe concrete flexural member 6 for anode, external direct current power supply 20 starts corrosion, and the amount of deflection of periodic logging load and correspondence thereof and support settlement are until reach corrosion/load the time limit for a long time during this period.
Destroy load phase: as shown in Figure 4, extract corrosive liquid 18 out, remove external direct current power supply 20 and etching tank 3 and upper cathodic plate 19, do disposable destruction load test with lifting jack 13, record amount of deflection and the support settlement of load and correspondence thereof simultaneously.
The solid steel pipe the concrete flexure member in one party cross section is adopted to carry out performance test under load with corrosion, its length L=1250mm; Clear span L '=1050mm; Outer length of side B=160mm; Steel pipe original wall thickness t
s=3.83mm; Corrosion thickness Δ t=0.69mm; Corrosive liquid concentration ρ=3.5%; Design is held and is carried grade r
b=60%; Etching time t=120d.Moment of flexure (M)-mid-span deflection (u obtained after off-test
m) stressed the Complete Curve as shown in Figure 6, wherein fine line is initial loading stage test findings; Heavy line is galvanic corrosion/long-term load phase test findings; Dotted line is for destroying load phase test findings.
Claims (3)
1. study the device of steel pipe the concrete flexure member performance under load with corrosion for one kind, the action of long-term load to steel pipe concrete flexural member and galvanic corrosion effect can be realized simultaneously, it is characterized in that by charger, corrosion device and measurement mechanism three part form, wherein charger mainly comprises lifting jack, large bearing, little bearing, pull bar, nut, distribution beam, loading beam and reaction beam; Corrosion device mainly comprises steel etching tank, upper cathodic plate, corrosive liquid, insulation course and external direct current power supply; Measurement mechanism mainly comprises load transducer and mechanical type clock gauge and tablet and connecting link; Steel pipe concrete flexural member is placed in the steel etching tank of corrosion device, and on steel pipe concrete flexural member, places charger simultaneously, is measured steel pipe concrete flexural member action of long-term load and galvanic corrosion effect by measurement mechanism;
Wherein two large bearings and two pull bars are fixed on ground, and steel etching tank is placed on two large bearings; Base plate in steel etching tank places two little bearings of freely-supported; Between the base plate of steel etching tank and the little bearing of freely-supported, insulation course is set;
Placing steel tubes the concrete flexure member on two little bearings of freely-supported, steel pipe concrete flexural member places two little bearings of distribution beam, between steel pipe concrete flexural member and two little bearings of distribution beam, arranges insulation course;
Distribution beam placed by two little bearings of distribution beam, then in distribution beam, places load transducer; Loading beam to be placed on load transducer through two pull bars and to be fixed by nut; Loading beam places lifting jack, then reaction beam to be placed on lifting jack through two pull bars and to be fixed by nut;
Two mechanical type clock gauges are placed on the tablet on the Bending moment axis being welded on steel pipe concrete flexural member in advance respectively; Mid-span deflection and support settlement is measured respectively with mechanical type clock gauge;
With steel etching tank and the another upper cathodic plate arranged for negative electrode, with the steel pipe of steel pipe concrete flexural member for anode, external direct current power supply corrodes.
2. the device of steel pipe the concrete flexure member performance under load with corrosion is studied according to claim 1 one kind, it is characterized in that the exposed parts of the little bearing of described freely-supported needs insulation processing, the exposed parts of the little bearing of distribution beam needs insulation processing, and the connecting link between steel pipe concrete flexural member and tablet needs insulation processing.
3. study a method for steel pipe the concrete flexure member performance under load with corrosion, adopt the device of research steel pipe the concrete flexure member according to claim 1 performance under load with corrosion, it is characterized in that carrying out according to following steps:
(1) original upload, the amount of deflection of record load and correspondence thereof and support settlement;
(2) keep original upload value constant, in steel etching tank, inject corrosive liquid, external direct current power supply starts corrosion, the amount of deflection of record load and correspondence thereof and support settlement;
(3) remove steel etching tank, keep long-term loaded value constant, disposable destruction loads, the amount of deflection of record load and correspondence thereof and support settlement.
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| CN105628513B (en) * | 2016-02-29 | 2018-03-27 | 沈阳建筑大学 | Steel pipe concrete bending component is studied in load and the device and method of performance under corrosion |
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