CN105651474B - Beam analog loading test method is transported on prestressed concrete entire precasting box girders beam - Google Patents
Beam analog loading test method is transported on prestressed concrete entire precasting box girders beam Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0008—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings of bridges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0033—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining damage, crack or wear
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0041—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress
- G01M5/005—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress by means of external apparatus, e.g. test benches or portable test systems
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Abstract
The present invention relates to highway bridge construction method, beam analog loading test method is transported on more particularly to a kind of prestressed concrete entire precasting box girders beam, it is used in the construction of highway bridge, and its step is：A, using unilateral static test, the load condition of one of beam in simulated test double width beam；B, beam car load is simulated by the way of multipoint excitation, when testing 5 points/7 points/9 points/11 points loadings respectively, record test beam force-bearing situation and the parameter differences under the effect of actual beam car, contrast selection loading points；C, under the loading points selected in finite element modelling step B, the specific loading condition of test beam；If D, stress state is normal in step C, actual loading test is carried out, detection test beam is in the stress state of each testing section, amount of deflection and crack situation；It is an object of the invention to provide beam analog loading test method is transported on a kind of prestressed concrete entire precasting box girders beam suitable for highway bridge.
Description
Technical field
The present invention relates to highway bridge construction method, transported on more particularly to a kind of prestressed concrete entire precasting box girders beam
Beam analog loading test method.
Background technology
In recent years, the freeway traffic career development in China is rapid, and construction technology and quality standard improve constantly, in land
In upper conventional highway projects elevated bridge account for construction project proportion it is increasing.It is and swift and violent with high speed railway construction
Development, prefabricated, the assembling technology of bridge have obtained significant progress, and it is notable to achieve significant economical, societal benefits.
Highway precast bridge is due to its broad categories, and influence factor is more, and relevant policies system implementation dynamics is weaker, in industry not yet
Formed it is unified design, be prefabricated, detection, the technical standard such as evaluation.Therefore, the research for highway precast bridge correlation technique shows
Obtain particularly urgent.
Wherein, large-tonnage prestressed concrete entire precasting box girders with its rigidity of structure is big, good integrity, construction quality can
The technical characterstic such as control and rapid construction has obtained relatively broad application in the construction of current highway.But due to beam body knot
Structure complexity is various, and scale of construction tonnage is huge, how to ensure safety, guarantee quality in construction, expeditiously construction seems particularly heavy
Will.
It is the main of Bridge performance experiment to transport beam form on prestressed concrete entire precasting box girders beam to intend load test
Content, it is to examine bridge performance this crucial corner, the important technical of overall target.Railroad bridge tries for static load
Test appearance《Prestressed concrete railway bridge simply supported beam dead load bends experiment method and evaluation criteria》TB/T2092-2003, and
Highway bridge, which there is no, clearly refers to specification, causes the detection of highway precast beam, evaluation without according to can follow.
The content of the invention
It is an object of the invention to overcome the above-mentioned deficiency in the presence of prior art, there is provided one kind is applied to highway bridge
Prestressed concrete entire precasting box girders beam on transport beam analog loading test method.
In order to realize foregoing invention purpose, the invention provides following technical scheme：
Beam analog loading test method is transported on a kind of prestressed concrete entire precasting box girders beam, it is used for highway bridge
In construction, beam operating mode, its step are transported under construction simulation the most unfavorable processing condition, i.e. simply-supported state on across the double width beam of prefabricated case beam bicycle
For：
A, using unilateral static test, the load condition of one of beam in double width beam described in simulated test, headed by the beam
Piece beam, the first beam lay some sensors in the beam stage processed；
B, beam car load is simulated by the way of multipoint excitation, when testing 5 points/7 points/9 points/11 points loadings respectively, note
Record test beam force-bearing situation and the parameter differences under the effect of actual beam car, the minimum loading points of contrast selection differences；
C, in step B described in finite element modelling, under selected loading points, the specific loading condition of test beam, judge
Whether stress state is normal；
If D, stress state is normal described in step C, actual loading test is carried out, detection test beam is cut in each test
Stress state, amount of deflection and the crack situation in face.
Step A is first passed through, using unilateral static test, prefabricated case beam under construction simulation the most unfavorable processing condition, i.e. simply-supported state
Beam operating mode is transported on across the double width beam of bicycle, then by step B Experimental Comparison, rational loading points are selected, so as to follow-up
Then load test result further ensures that the safety of actual tests by C simulation again, avoided closer to actual fortune beam operating mode
The defects of unnecessary, occurs, such as the appearance in crack, finally carries out actual tests, as stated in the Background Art, does not have on highway bridge
There is specific standard to do this part thing, by this mode, a kind of prestressed concrete suitable for highway bridge can be provided
On entire precasting box girders beam transport beam analog loading test method, make follow-up load test more reasonable, at the same load closer to
Actual fortune beam operating mode.
As the preferred scheme of the present invention, in step D, be divided to two loaded cycles to carry out in actual loading test, make finally
Result of the test is more accurate, transports beam operating mode closer to actual, further ensures the safety of actual fortune beam.
As the preferred scheme of the present invention, in step B, the parameter differences include：Mid span moment, span centre deformation, fulcrum
Shearing.
As the preferred scheme of the present invention, in step B, the parameter differences also include：Quartile moment of flexure, quartile become
Shape, the contrast more refined, preferably to select loading to count, so that follow-up load test result transports beam closer to actual
Operating mode.
As the preferred scheme of the present invention, in step B, the loading points selection is 7 points, and load(ing) point spacing is
3.856m, the scheme more refined, it is 35m prefabricated case beams by fortune beam load specific to beam car weight 300T.
As the preferred scheme of the present invention, in step D, during actual loading test Scheme Choice, by limited in step C
The position for the sensor that first analog result and the first beam are laid in the beam stage processed, combination are determined in actual loading test
The arrangement of each measuring point, make whole experiment process more economical, accurate.
As the preferred scheme of the present invention, in step D, each measuring point includes：
Control section vertical, horizontal pressure detection point；
Prefabricated case beam web principal tensile stress measuring point；
Deformation/amount of deflection measuring point.
As the preferred scheme of the present invention, in described two loaded cycles, first time loaded cycle and second of loading follow
The first time loading of ring loads since 0.4 times of plan payload values.
As the preferred scheme of the present invention, the first time loaded cycle highest payload values are raised to 1 times of plan payload values
Size, second of loaded cycle highest payload values are raised to 1.1 times of sizes of plan payload values.
Compared with prior art, beneficial effects of the present invention：
There is provided and beam form plan load test is transported on a kind of prestressed concrete entire precasting box girders beam suitable for highway bridge
Method, make follow-up load test more reasonable, while load closer to actual and transport beam operating mode.
Brief description of the drawings：
Fig. 1 is the beam-ends section units division figure in finite element modelling in the embodiment of the present invention 1；
Fig. 2 is the fortune beam load loading position schematic diagram in finite element modelling in the embodiment of the present invention 1；
Fig. 3 is vertical, horizontal stress analysis control section schematic diagram in step D in the embodiment of the present invention 1；
Fig. 4 is control section longitudinal stress point layout schematic diagram in step D in the embodiment of the present invention 1；
Fig. 5 is control section lateral stress point layout schematic diagram in step D in the embodiment of the present invention 1；
Fig. 6 is amount of deflection point layout schematic diagram in step D in the embodiment of the present invention 1；
Fig. 7 is short limb edge lateral deflection schematic diagram in the embodiment of the present invention 1 in circulation record for the first time；
Fig. 8 is long edge of a wing lateral deflection schematic diagram in the embodiment of the present invention 1 in circulation record for the first time；
Fig. 9 is short limb edge lateral deflection schematic diagram in the embodiment of the present invention 1 in second of circulation record；
Figure 10 is long edge of a wing lateral deflection schematic diagram in the embodiment of the present invention 1 in second of circulation record；
Figure 11 is the first loaded cycle schematic diagram of test beam in the embodiment of the present invention；
Figure 12 is the second loaded cycle schematic diagram of test beam in the embodiment of the present invention；
Embodiment
With reference to embodiment and embodiment, the present invention is described in further detail.But this should not be understood
Following embodiment is only limitted to for the scope of the above-mentioned theme of the present invention, it is all that this is belonged to based on the technology that present invention is realized
The scope of invention.
Embodiment 1
Beam analog loading test method is transported on a kind of prestressed concrete entire precasting box girders beam, it is used for highway bridge
In construction, beam operating mode, the present embodiment are transported under construction simulation the most unfavorable processing condition, i.e. simply-supported state on across the double width beam of prefabricated case beam bicycle
In, specially Construction of Hangzhou Bay Cross-sea Bridge Hangzhou-Zhejiang high speed connecting line highway engineering, in addition to using now sprinkle total box bridge except part, remaining is big
Part on batch production framing concentration pre-casting box beam, beam using beam, the technical scheme of full span erection is transported, in the land conventional public affairs in China
To use first in road and bridge beam, the engineering is relied on, according to prestressed concrete highway bridge simply supported beam dead load bends experiment method, is opened
Static test twice is opened up, to examine box beam construction quality and the test method whether feasible, its step is：
A, using unilateral static test, the load condition of one of beam in double width beam described in simulated test, headed by the beam
(the left width prefabricated case beam of first 32.5m end bay, before static test, it is eventually and laterally pre- that the beam has completed longitudinal prestressing to piece beam
Stress tension, beam car weight 300T, considered by fortune beam load by 35m prefabricated case beams), if the first beam is laid in the beam stage processed
Dry sensor；
B, beam car load is simulated by the way of multipoint excitation, when testing 5 points/7 points/9 points/11 points loadings respectively, note
Recording test beam force-bearing situation, (parameter differences include with the parameter differences under the effect of actual beam car：Mid span moment, span centre become
Shape, fulcrum shearing, the deformation of quartile moment of flexure, quartile), the minimum loading points of contrast selection differences；
Detailed process is as follows：
Unilateral static test simulates beam car load by the way of multipoint excitation, investigates respectively at 5 points/7 points/9 points/11 points
During loading, test beam force-bearing situation and the difference under beam car effect, such as table 1 below, key point internal force and the ratio of deformation are listed
Compared with interior unit of force is kN, kN.m in table, and deformation unit is mm.
The equivalent load internal force of table 1, deformation comparison
The size of each operating mode payload values is examined according to mid span moment determination equal with fortune beam operating mode, fortune beam operating mode in form
1.15 unbalance loading coefficient is considered；Vertical deformation considers the torsional effect calculated by single-beam；Point of load application is being counted during multipoint excitation
Calculate across footpath (30.85m) interior equidistant placement；
From table 1, internal force and deformation are preferably identical with fortune beam operating mode when being loaded using 7 points, continue increase loading
Points have little significance and can increase experiment difficulty, therefore the preliminary scheme drafted using 7 points of loadings, load(ing) point spacing are
3.856m, after considering 1.1 coefficient of impact, the payload values planning to use are 569kN (because prefabricated case beam top plate has 2% horizontal stroke
Slope, to ensure the steady safety of jack loading, intend setting gad block in loading Position levelling, set shaped steel backing plate, steel on voussoir again
Limit steel bar is laid around voussoir, or it is levelling with reference to bearing pad stone way, to ensure the reliability of loading)；
In the present embodiment, with reference to field test condition, static test is carried out on the static load pedestal of bale handle station, experiment is using anti-
Formula static test scheme is pulled out, static test pedestal, stand and resistance to plucking attachment means are computed meeting to require；
C, in step B described in finite element modelling, under selected loading points, the specific loading condition of test beam, judge
Whether stress state is normal；
In the present embodiment, space material object unit model, concrete are established using finite element software ANSYS program
Using SOLID45 units, steel Shu Caiyong LINK8 unit simulations, as shown in Figure 1.Transport beam load is using 7 points of loadings, spacing
3.856m as shown in Figure 2.
Simulation is transported the beam stage, the direct stress distribution on test model, is specifically obtained：
1. in the case where beam load action is transported in simulation, the deformation of precast beam is smaller, and maximum distortion is -2.5mm and+7.3mm；2. remove
Outside the stress of loading and support region, precast beam longitudinal direction is basic to be pressurized, and controlling sections maximum crushing stress is 6.39MPa；It is prefabricated
Laterally there is tension in beam, is generally present in the lower edge of cantilever root, and as caused by transverse prestress, generally 1.50MPa is left
The right side, controlling sections maximum transversal compression are 8.06MPa.In a word, precast beam transports the stress state under beam load action in simulation
It is normal, stress is capable of the requirement of design specification.
If D, stress state is normal described in step C, carries out actual loading test and (be divided to two in actual loading test
Loaded cycle is carried out, the sensor laid by the finite element modelling result in step C and the first beam in the beam stage processed
Position, combination determine the arrangement of each measuring point in actual loading test, and each measuring point includes：Control section is longitudinal and transverse
To pressure detection point；Prefabricated case beam web principal tensile stress measuring point；Deformation/amount of deflection measuring point, the experiment of vertical, horizontal structural concrete stress
For testing and control section as shown in figure 3, wherein S1, S2, S4, S5 are respectively at web variable cross-section, S3 is span centre section), detection examination
Beam is tested in the stress state of each testing section, amount of deflection and crack situation.
Specific measuring point is not known as follows：
1. control section vertical, horizontal pressure detection point is arranged
According to ANSYS Calculation results, prefabricated case beam strains point layout such as Fig. 4 extremely in the vertical, horizontal of control section
Shown in Fig. 5；
2. prefabricated case beam web principal tensile stress is arranged
According to《Highway reinforced concrete and prestressed concrete bridge contain design specification》(JTG D62-2004), A classes in advance should
Power reinforced concrete member combines in effect short-term effect, considers the cracking resistance of oblique section, according to calculation simulation analysis, carries out
Concrete principal tensile stress measuring point is laid；
3. deformation/deflection test of test component
Amount of deflection point layout is as shown in Figure 6；
With kind highway projects more than Ningbo, (project uses the asymmetric entire precasting box girders of large-tonnage to this patent, pre-
Field concentration pre-casting processed, 774 altogether) it is background, tested with reference to simulation loading twice, and use for reference railway standard TB/T2092-
2003, summarize and beam form plan load test side is transported on a set of prestressed concrete entire precasting box girders beam suitable for highway bridge
Method；
When being loaded, under specifically being permitted, the loading of test beam is divided to two circulations to carry out.Loading etc. is represented with loading coefficient K
Level, loading coefficient K is the ratio between the moment of flexure that beam body span centre is born in load test and design moment.Experiment preparation terminates the back rest
The loading status that body is born is original state.
First loaded cycle process such as Figure 11；
Second loaded cycle process such as Figure 12；
During unilateral static test, box beam (test beam) is predominantly detected in the stress state of each testing section, amount of deflection and is split
Seam situation, the collection of test data use wireless automatic collecting system；
Test result is as follows,
(1) first time static test；
In first circulation loading procedure, when load reaches 1.0 grades, the amount of deflection of experiment beam deflection maximum span centre position
For 7.91mm, deflection span ratio 1/3900, when load reaches 1.1 grades, the mid-span deflection of test beam is 8.50mm, deflection span ratio 1/
3629；
In loading procedure, the nominal growth of each vertical displacement measuring point is similar to linearly, trend stability, show at the stress of beam
In elastic range；
Test whole viewing test beam and do not find the visual defects such as stress crack；
Amount of deflection figure such as Fig. 7,8；
(2) second of static test；
In second circulation loading procedure, when load reaches 1.0 grades, the amount of deflection of experiment beam deflection maximum span centre position
For 8.93mm, deflection span ratio 1/3583, when load reaches 1.1 grades, the mid-span deflection of test beam is 9.96mm, deflection span ratio 1/
3213；
In loading procedure, the nominal growth of each vertical displacement measuring point is similar to linearly, trend stability, show at the stress of beam
In elastic range；
Test whole viewing test beam and do not find the visual defects such as stress crack；
Amount of deflection figure such as Fig. 9,10.
Claims (9)
1. transporting beam analog loading test method on a kind of prestressed concrete entire precasting box girders beam, it is used for applying for highway bridge
In work, beam operating mode is transported under construction simulation the most unfavorable processing condition, i.e. simply-supported state on across the double width beam of prefabricated case beam bicycle, its step is：
A, using unilateral static test, the load condition of one of beam in double width beam described in simulated test, piece beam headed by the beam,
The first beam lays some sensors in the beam stage processed；
B, beam car load is simulated by the way of multipoint excitation, when testing 5 points/7 points/9 points/11 points loadings respectively, record examination
Test beam stress situation and the parameter differences under the effect of actual beam car, the minimum loading points of contrast selection differences；
C, in step B described in finite element modelling, under selected loading points, the specific loading condition of test beam, stress is judged
Whether state is normal；
If D, stress state is normal described in step C, actual loading test is carried out, detection test beam is in each testing section
Stress state, amount of deflection and crack situation.
2. beam analog loading test method is transported on prestressed concrete entire precasting box girders beam according to claim 1, its
It is characterised by, is divided to two loaded cycles to carry out in step D, in actual loading test.
3. beam analog loading test method is transported on prestressed concrete entire precasting box girders beam according to claim 2, its
It is characterised by, in step B, the parameter differences include：Mid span moment, span centre deformation, fulcrum shearing.
4. beam analog loading test method is transported on prestressed concrete entire precasting box girders beam according to claim 3, its
It is characterised by, in step B, the parameter differences also include：Quartile moment of flexure, quartile deformation.
5. beam analog loading test method is transported on prestressed concrete entire precasting box girders beam according to claim 4, its
It is characterised by, in step B, the loading points selection is 7 points, and load(ing) point spacing is 3.856m.
6. beam analog loading test method is transported on prestressed concrete entire precasting box girders beam according to claim 5, its
It is characterised by, in step D, during actual loading test Scheme Choice, by the finite element modelling result in step C and described first
The position for the sensor that beam is laid in the beam stage processed, combination determine the arrangement of each measuring point in actual loading test.
7. beam analog loading test method is transported on prestressed concrete entire precasting box girders beam according to claim 6, its
It is characterised by, in step D, each measuring point includes：
Control section vertical, horizontal pressure detection point；
Prefabricated case beam web principal tensile stress measuring point；
Deformation/amount of deflection measuring point.
8. beam analog loading test method is transported on prestressed concrete entire precasting box girders beam according to claim 7, its
It is characterised by, in described two loaded cycles, the first time of first time loaded cycle and second of loaded cycle is loaded from meter
Draw payload values 0.4 times starts to load.
9. beam analog loading test method is transported on prestressed concrete entire precasting box girders beam according to claim 8, its
It is characterised by, the first time loaded cycle highest payload values are raised to 1 times of size of plan payload values, and second of loading follows
Ring highest payload values are raised to 1.1 times of sizes of plan payload values.
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Families Citing this family (8)
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| CN106546495B (en) * | 2016-11-09 | 2019-01-29 | 广西交通科学研究院有限公司 | The naked beam Static Load Test Method of load control moment is determined based on strain |
| CN109183599B (en) * | 2018-08-09 | 2020-09-01 | 中铁大桥勘测设计院集团有限公司 | Asymmetric large cantilever arm-steel box combined structure |
| CN109507387A (en) * | 2018-10-26 | 2019-03-22 | 扬州工业职业技术学院 | A kind of construction method of domes original position accumulated loading test |
| CN110387806B (en) * | 2019-07-31 | 2021-04-06 | 中交路桥北方工程有限公司 | Prestressed beam slab deflection deformation control method |
| CN111551326B (en) * | 2020-05-28 | 2022-01-28 | 广西交科集团有限公司 | Displacement monitoring method for settlement foundation layered casting concrete beam |
| CN111859768B (en) * | 2020-07-30 | 2021-07-16 | 广西交科集团有限公司 | Test method for determining deflection of box girder bridge based on single-girder finite element model |
| CN112345181A (en) * | 2020-10-23 | 2021-02-09 | 福建广铁钢结构有限公司 | T-beam static load test method |
| CN114018170A (en) * | 2021-11-05 | 2022-02-08 | 中交一公局第七工程有限公司 | Prefabricated box girder monitoring method based on BIM |
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Address after: Jinniu District Kam Tong Road Chengdu city Sichuan province 610031 No. 16 Co-patentee after: CHINA RAILWAY ERJU CORPORATION CHING ENGINEERING Co.,Ltd. Patentee after: China Railway Second Bureau Construction Co.,Ltd. Address before: Jinniu District Kam Tong Road Chengdu city Sichuan province 610031 No. 16 Co-patentee before: CHINA RAILWAY ERJU CORPORATION CHING ENGINEERING Co.,Ltd. Patentee before: CHINA RAILWAY NO.2 ENGINEERING GROUP Co.,Ltd. |
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Effective date of registration: 20190808 Address after: Jinniu District Kam Tong Road Chengdu city Sichuan province 610031 No. 16 Co-patentee after: CHINA RAILWAY ERJU CORPORATION CHING ENGINEERING Co.,Ltd. Patentee after: CHINA RAILWAY NO.2 ENGINEERING GROUP Co.,Ltd. Address before: Jinniu District Kam Tong Road Chengdu city Sichuan province 610031 No. 16 Co-patentee before: CHINA RAILWAY ERJU CORPORATION CHING ENGINEERING Co.,Ltd. Patentee before: China Railway Second Bureau Construction Co.,Ltd. |
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