CN101101249A - 32m/900t prestressed concrete pretension box beam static loading test method - Google Patents
32m/900t prestressed concrete pretension box beam static loading test method Download PDFInfo
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- CN101101249A CN101101249A CNA2007100496454A CN200710049645A CN101101249A CN 101101249 A CN101101249 A CN 101101249A CN A2007100496454 A CNA2007100496454 A CN A2007100496454A CN 200710049645 A CN200710049645 A CN 200710049645A CN 101101249 A CN101101249 A CN 101101249A
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- 238000010998 test method Methods 0.000 title claims abstract description 13
- 230000003068 static effect Effects 0.000 title claims description 37
- 239000011513 prestressed concrete Substances 0.000 title claims description 10
- 238000012360 testing method Methods 0.000 claims abstract description 88
- 238000013461 design Methods 0.000 claims abstract description 37
- 230000004087 circulation Effects 0.000 claims abstract description 10
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 12
- 238000010276 construction Methods 0.000 claims description 7
- 239000000725 suspension Substances 0.000 claims description 6
- 240000002853 Nelumbo nucifera Species 0.000 claims description 3
- 235000006508 Nelumbo nucifera Nutrition 0.000 claims description 3
- 235000006510 Nelumbo pentapetala Nutrition 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 125000004122 cyclic group Chemical group 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 3
- 239000011150 reinforced concrete Substances 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000004873 anchoring Methods 0.000 claims description 2
- 239000004567 concrete Substances 0.000 abstract description 2
- 238000002474 experimental method Methods 0.000 abstract 1
- 238000005259 measurement Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000005336 cracking Methods 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 208000035126 Facies Diseases 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000001568 sexual effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
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Abstract
The invention discloses a test procedure of 32m/900t pre stress pre open box girder concrete box, it includes building testing counter, laying test beam body, fixing balance weight and setting test equipment, and doing load test of three circulation by ordering step by step, and dong crack test for the 32m/900t pre open box girder effectively, splitting test and breaking test, dong experiment for the design of 32m pre open box girder, construct artwork, workmanship and the anti split and intensive properties of box girder.
Description
Technical field
The present invention relates to a kind of static load test method, the particularly a kind of static test pedestal and static deflection test method that can be applied to the crazing-resistance test of the prestressed concrete pre-tensioned case beam of 32m/900t, split test and failure test.
Background technology
At present, Beijing-Tianjin inter-city railway, close peaceful, close Passenger dedicated railway Bridge such as force, Zheng Xi and all adopted 32m/900t level prestressed concrete box girder, the case beam need carry out static deflection crazing-resistance test under 1.2 grades of loads, the about 1400t of loading force, the about 1500t of static test pedestal holding capacity that is adopted.Open the case beam earlier except that carrying out crazing-resistance test and close peaceful railway 3 hole 32m/900t levels, also to carry out the failure test of split test and 2.0 grades of maximums to it, the about 3000t of static test pedestal holding capacity that is adopted, considerably beyond the loading force under 1.2 grades of loads, existing testing table and test method can't satisfy testing requirements, can't verify first cracking resistance and the strength character of opening design, construction technology, construction quality and the case beam of case beam of 32m.
Summary of the invention
The objective of the invention is to: a kind of static test pedestal and the static deflection test method that can carry out crazing-resistance test, split test and failure test to the prestressed concrete pre-tensioned case beam of 32m/900t is provided.
Technical scheme of the present invention is:
The prestressed concrete pre-tensioned case beam of a kind of 32m/900t Static Load Test Method, it is characterized in that, its testing table includes the testing bed, testing stand at two ends, be provided with the grade beam of reinforced concrete frame structure between testing bed, testing stand, establish the end floor beam and the middle cross beam that are used to load counterweight between grade beam, be embedded with anchor rod in the grade beam, anchor rod, suspension rod and shoulder pole girder are steel construction, adopt bolted on connection; And test according to following steps:
A. at first counterweight is winched on the end floor beam between the base beam of static test pedestal two places, static test being opened earlier the case beam moves on the pedestal on the grade beam and installs bearing again, with pull bar pass the pre-buried static load of test beam body hole and and grade beam on pre-buried anchoring rockbolt tie, connect shoulder pole girder and pull bar, adjust pull bar and shoulder pole girder to design attitude, formerly open between case back portion and the shoulder pole girder lifting jack is installed, lifting jack is connected with oil meter, oil circuit, oil pump, oil pump feed, two lifting jack parallel connections under the same shoulder pole girder, every lifting jack is furnished with valve in addition and can controls separately, lifting jack roof pressure beam body to the beam body reinforcing carry out static test;
B. formerly open on the case beam arrange outer paste the vibrating string type strain measuring point, in bury strain measuring point, amount of deflection measuring point, compressive load sensor, the data of each measuring point and sensor are by the data acquisition module record and directly imports computing machine into;
C. divide three circulations to carry out the static deflection test, first cyclic load is loaded on 1.0 times of design loads, and being divided into is 5 grades; Second circulation is split test, and load is loaded on 1.55 times of design loads, and being divided into is 15 grades; The 3rd circulation is failure test, and load is loaded on 2.0 times of design loads, and being divided into is 19 grades; Every grade of loading is spaced apart 3～5 minutes, reads measuring point data when every grade of loading is finished, and holds lotus 20 minutes when first and second round-robin 1.0 and 1.2 times of design loads, observes beam body crack.
The invention has the beneficial effects as follows: this Static Load Test Method can successfully be opened the case beam earlier to the 32m/900t level and be carried out crazing-resistance test, split test and failure test, 32m is opened the cracking resistance and the strength character of design, construction technology, construction quality and the case beam of case beam earlier and verifies.
Description of drawings
Fig. 1 is that synoptic diagram is arranged in static test pedestal of the present invention longitudinal section.
Fig. 2 is a static test pedestal cross sectional arrangement synoptic diagram.
Fig. 3 is the arrangenent diagram of measuring point on the spaning middle section.
Fig. 4 is the measuring point arrangenent diagram on the presstressed reinforcing steel break cross section.
Fig. 5 is a loading synoptic diagram of opening case beam static test earlier.
Fig. 6 is a loading synoptic diagram of opening case beam static test earlier.
Wherein, Reference numeral: 1 is testing bed, testing stand, and 2 is to open earlier the case beam, and 3 be shoulder pole girder, and 4 be suspension rod, and 5 is anchor rod, and 6 is grade beam, and 7 is counterweight, and 8 is subsides measuring point outward, and 9 bury measuring point in being, 10 is lifting jack.
Embodiment
The present invention is further described below in conjunction with drawings and Examples.
The prestressed concrete pre-tensioned case beam of 32m/900t Static Load Test Method, its testing table includes the testing bed, testing stand 1 at two ends, 1 of testing bed, testing stand is provided with the grade beam 6 of reinforced concrete frame structure, 6 of grade beams are established end floor beam and the middle cross beam that is used to load counterweight 7, be embedded with anchor rod 5 in the grade beam 6, anchor rod 5, suspension rod 4 and shoulder pole girder 3 are steel construction, adopt bolted on connection, as depicted in figs. 1 and 2.
Test procedure is as follows:
At first counterweight 7 is winched on the end floor beam of 6 on static test pedestal two places base beam, static test being opened earlier case beam 2 moves on the pedestal on the grade beam 6 and installs bearing again, with pull bar pass the pre-buried static load of test beam body hole and and grade beam 6 on pre-buried anchor rod 5 bolts tie, connect shoulder pole girder 3 and suspension rod 4, adjust suspension rod 4 and shoulder pole girder 3 to design attitude, formerly open lifting jack 10 is installed between case beam 2 tops and the shoulder pole girder 3, lifting jack 10 is connected with oil meter, oil circuit, oil pump, oil pump feed, every lifting jack 10 is furnished with valve in addition and can controls separately, lifting jack 10 roof pressure beam bodies to the beam body reinforcing carry out static test, loading position such as Fig. 5, shown in 6.
Secondly, formerly open span centre, 1/4 cross section on the case beam 2 arrange altogether outer paste measuring point 8 and in bury measuring point 9, it pastes 88 of vibrating string type strain measuring points at home and abroad, buries 32 of strain measuring points in other has, wherein in the 3.0m scope of span centre lower flange, case beam both sides, arrange outer 30 of the vibrating string type strain measuring points that paste; Simultaneously, arrange 6 of measuring points of amount of deflection (employing dial gauge), 10 of compressive load sensors.Bury vibrating string type strain measuring point layout in outer subsides reach and see Fig. 3,4.6 amount of deflection measuring points are arranged in the side and the bottom surface, span centre both sides at 4 bearing centers.The model and the precision of each measuring point and sensor are as shown in table 1.
Table 1 static test key instrument, equipment gather
| Sequence number | Title | Model | Performance index | Quantity |
| 1 | The automatic Synthesis test macro | JMZX-2000 | Test specification: 0-5000pa measuring accuracy: ± 0.5% | 2 |
| 2 | The synthetical collection module | JMZX-16A JMZX-32A | Test specification: 0-5000pa measuring accuracy: ± 0.5% | 22 |
| 3 | The intelligent digital strain transducer | JMZX-212A JMZX-215A | Test specification: ± 10000pa measuring accuracy: ± 0.5% | 88 32 |
| 4 | Precision level | TG-2 | Test specification: measuring accuracy: ± 0.1 |
2 |
| 5 | Pressure transducer | Peak load: 2500kN measuring accuracy: ± 0.5% |
10 | |
| 6 | Dial gauge | Test specification: 0-50mm measuring accuracy: ± 0.01 |
6 |
In the static test, two lifting jack 10 parallel connections under shoulder pole girder 3, side, every top is furnished with valve in addition and can controls separately, loading velocity is very fast and can guarantee each top power basically identical, the vibrating string type strain transducer result is by the data acquisition module record and directly import computing machine into, test figure has realized automation collection substantially, and every grade of data acquisition time can be controlled in 3 minutes.
After finishing above-mentioned operation, carry out three round-robin static deflection tests altogether to opening case beam 2 earlier, first cyclic load is loaded on 1.0 times of design loads, and being divided into is 5 grades, and every some peak load is 1078kN; Second circulation is split test, and load is loaded on 1.55 times of design loads, and being divided into is 15 grades, and every some peak load is 1913kN; The 3rd circulation is failure test, and load is loaded on 2.0 times of design loads, and being divided into is 19 grades, and every some peak load is 2606kN.Every grade loads at interval (comprise and survey read time) is 3～5 minutes, holds lotus 20 minutes when first and second round-robin 1.0 and 1.2 times of design loads, observes beam body crack.
In the actual measurement of present embodiment, first, second and the 3rd loaded cycle span centre static live load amount of deflection are respectively 6.54mm, 6.48mm and 6.33mm, and deflection span ratio is respectively 1/4817,1/4861 and 1/4976, and satisfied design is not more than 1/3982 requirement.During second CYCLIC LOADING to 1.2 times design load, actual measurement mid-span deflection average out to 19.19mm is less than design calculated value 20.97mm.
Second CYCLIC LOADING to 1.2 times design load, be distributed in the actual measurement strain and the basic retention wire sexual intercourse of load (the facies relationship number average is greater than 0.999) of 30 measuring points in the span centre 3.0m scope of case beam both sides, do not occur obviously increasing or reducing, the zone of chamber beam tension maximum still is in elastic stage; Be loaded on 1.45 times of design loads, instrument demonstrates strain obvious increase; Be loaded on 1.5 times of design loads, macroscopic crack appears in the span centre lower edge.
Analyze span centre stress test result, case beam cracking load is 1722.8kN, and class of loading is K
1=1.422 (being designed to 1.39) are than design load bigger 2.3%.
Under 1.2 times of design load effects, the stress of both sides lower edge is respectively 12.08MPa and 12.02MPa in the measured test case girder span, and average 12.05MPa is quite approaching with respective calculated 11.55MPa.
The split test test result shows that the load that diagonal crack appears in beam-ends is 1766 kN, and corresponding class of loading is K
f=1.45.
According to the actual Stress Measurement result, calculate that case girder span middle section neutral axis height is 1.642m, 1.765m differs 6.97% with design load, and actual measurement base plate average thickness is bigger by 4.33% than design load (300mm), and each the physical dimension control of all the other beam bodies is better.
The 3rd circulation is heavily split in the test, and when being loaded on design load, actual measurement amount of deflection and the strain of span centre lower flange is all linear with load, the beam body lower edge pressure that do not disappear as yet; When being loaded on 1.15 times of design loads, actual measurement strain and amount of deflection all have obvious increase, illustrate the beam body disappeared pressure, enter the linear elasticity stage; Be loaded on 1.25 times of design loads, naked eyes have been as seen in span centre lower edge former crack; When being loaded on 1.35 times of design loads, new crack has appearred in the span centre lower edge.
According to span centre strain testing result, it is 1246kN that the chamber beam heavily splits load, and corresponding class of loading is K
f=1.109 (being designed to 1.08).
Chamber beam break cross section diagonal crack cracking load is 2128kN, and the conversion moment of flexure is 116508kNm, and corresponding class of loading is K
f=1.69; Break cross section bending cracks cracking load is 2301kN, and the conversion moment of flexure is 125979.8kNm, and corresponding class of loading is K
f=1.8.
Under the operation load, the strength assurance coefficient of case beam design is greater than 2.0, and beam-ends oblique section shearing strength safety coefficient minimum is 2.05, in the cross section of distance beam-ends 5m.
The case beam is in the failure test stage, and when promptly being loaded on 1.6～2.0 times of design loads, beam body span centre lower edge and beam-ends web produce new bending cracks and diagonal crack successively; When 1.7 times of design loads, span centre increases 10 bending cracks newly, and two end webs increase 9 diagonal cracks newly, and existing simultaneously crack is also in continuous extension, and diagonal crack has extended to top board; When 1.8 times of design loads, the span centre bending cracks has extended to the web top.
When being loaded on 2.0 times of design loads, beam body fracture distribution is even, and form and development trend are normal, and concrete conquassation or prestress wire fracture of wire phenomenon do not appear in the beam body, and span centre crack, unloading back is closed substantially, shows that Liang Tishang does not reach destruction.
After the said method test, the data of test findings are analyzed, prove that the prestressed concrete pre-tensioned case beam 2 of this 32m/900t can satisfy request for utilization.
Claims (2)
1. the prestressed concrete pre-tensioned case beam of 32m/900t Static Load Test Method, it is characterized in that, its testing table includes the testing bed, testing stand at two ends, be provided with the grade beam of reinforced concrete frame structure between testing bed, testing stand, establish the end floor beam and the middle cross beam that are used to load counterweight between grade beam, be embedded with anchor rod in the grade beam, anchor rod, suspension rod and shoulder pole girder are steel construction, adopt bolted on connection; And test according to following steps:
A. at first counterweight is winched on the end floor beam between the base beam of static test pedestal two places, static test being opened earlier the case beam moves on the pedestal on the grade beam and installs bearing again, with pull bar pass the pre-buried static load of test beam body hole and and grade beam on pre-buried anchoring rockbolt tie, connect shoulder pole girder and pull bar, adjust pull bar and shoulder pole girder to design attitude, formerly open between case back portion and the shoulder pole girder lifting jack is installed, lifting jack is connected with oil meter, oil circuit, oil pump, oil pump feed, two lifting jack parallel connections under the same shoulder pole girder, every lifting jack is furnished with valve in addition and can controls separately, lifting jack roof pressure beam body to the beam body reinforcing carry out static test;
B. formerly open on the case beam arrange outer paste the vibrating string type strain measuring point, in bury strain measuring point, amount of deflection measuring point, compressive load sensor, the data of each measuring point and sensor are by the data acquisition module record and directly imports computing machine into;
C. divide three circulations to carry out the static deflection test, first cyclic load is loaded on 1.0 times of design loads, and being divided into is 5 grades; Second circulation is split test, and load is loaded on 1.55 times of design loads, and being divided into is 15 grades; The 3rd circulation is failure test, and load is loaded on 2.0 times of design loads, and being divided into is 19 grades; Every grade of loading is spaced apart 3～5 minutes, reads measuring point data when every grade of loading is finished, and holds lotus 20 minutes when first and second round-robin 1.0 and 1.2 times of design loads, observes beam body crack.
2. the prestressed concrete pre-tensioned case beam of 32m/900t according to claim 1 Static Load Test Method, it is characterized in that, outer paste the vibrating string type strain measuring point, in bury strain measuring point, amount of deflection measuring point, compressive load transducer arrangements number and mode and be: subsides vibrating string type strain measuring point is 88 span centre, 1/4 cross section of case beam are arranged altogether outside, in having, other buries 32 of strain measuring points, wherein in the 3.0m scope of span centre lower flange, case beam both sides, arrange outer 30 of the vibrating string type strain measuring points that paste; Simultaneously, arrange 6 of amount of deflection measuring points, 10 of compressive load sensors.
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