CN105651474A - On-beam beam transporting simulation loading test method for prestressed concrete full-hole prefabricated box beam - Google Patents
On-beam beam transporting simulation loading test method for prestressed concrete full-hole prefabricated box beam Download PDFInfo
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- CN105651474A CN105651474A CN201511029145.5A CN201511029145A CN105651474A CN 105651474 A CN105651474 A CN 105651474A CN 201511029145 A CN201511029145 A CN 201511029145A CN 105651474 A CN105651474 A CN 105651474A
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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 invention relates to a construction method of highway bridges and particularly relates to an on-beam beam transporting simulation loading test method for a prestressed concrete full-hole prefabricated box beam. The method is applied to the construction of the highway bridges and comprises the following steps: (A) simulating and testing loading conditions of one of two beams by virtue of a single-side static test; (B) simulating the load of a beam transporting vehicle by virtue of a multipoint loading manner, recording parameter differences of the stress state and the actual beam transporting vehicle effect of the tested beam when loads on 5 points/7 points/9 points/11 points are respectively tested, and making comparison to select loading number of points; (C) carrying out finite element simulation on the specific loading working conditions of the tested beam under the loading number of points selected in the step B; and (D) if the stress state in the step C is normal, carrying out an actual load test, so as to detect the stress state, deflection and crack condition of the tested beam on each tested cross section. The on-beam beam transporting simulation loading test method for the prestressed concrete full-hole prefabricated box beam is applicable to the highway bridges.
Description
Technical field
The present invention relates to highway bridge construction method, particularly to fortune beam analog loading test method on a kind of prestressed concrete entire precasting box girders beam.
Background technology
In recent years, the freeway traffic career development of China is rapid, and construction technology and quality standard improve constantly, by land in conventional highway projects elevated bridge to account for the proportion of construction project increasing. And along with the fast development of high speed railway construction, prefabricated, the assemblingization technology of bridge obtains 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 many, and relevant policies system to carry out dynamics more weak, in industry not yet form the technical standards such as unified design, prefabricated, detection, evaluation. Therefore, seem particularly urgent for the research of highway precast bridge correlation technique.
Wherein, large-tonnage prestressed concrete entire precasting box girders is big with its rigidity of structure, good integrity, construction quality are controlled and the technical characterstic such as rapid construction obtains relatively broad application in the construction of current highway. But owing to girder construction complexity is various, scale of construction tonnage is huge, in construction, how to ensure that safety, guarantee quality, expeditiously construction are particularly important.
Prestressed concrete entire precasting box girders beam is transported beam form and intends the main contents that load test is Bridge performance test, be the important technical of this crucial corner of inspection bridge serviceability, aggregative indicator. Railroad bridge has put into effect " prestressed concrete railway bridge simply supported beam dead load bends experiment method and evaluation criteria " TB/T2092-2003 for static test, and highway bridge there is no clear and definite reference specification, causes that the detection of highway precast beam, evaluation are without according to following.
Summary of the invention
It is an object of the invention to overcome above-mentioned deficiency existing in prior art, it is provided that a kind of suitable in the prestressed concrete entire precasting box girders beam of highway bridge is transported beam analog loading test method.
In order to realize foregoing invention purpose, the invention provides techniques below scheme:
Fortune beam analog loading test method on a kind of prestressed concrete entire precasting box girders beam, it is in the construction of highway bridge, and construction simulation the most unfavorable processing condition, namely under simply-supported state, beam operating mode transported by prefabricated case beam bicycle on double width beam, the steps include:
A, the unilateral static test of employing, the load condition of one of them beam in double width beam described in simulation test, sheet beam headed by this beam, described first beam lays some sensors in the beam stage processed;
B, adopt the mode of multipoint excitation to simulate beam car load, test 5 point/11, point/9, point/7 respectively when loading, the parameter differences under record test beam force-bearing situation and actual beam car effect, the loading contrasting selection differences minimum is counted;
In step B described in C, finite element modelling, selected loading is counted down, the loading condition that test beam is concrete, it is judged that whether stress state is normal;
If stress state described in D step C is normal, then carrying out actual loading test, detection test beam is in the stress state of each testing section, amount of deflection and crack situation.
First pass through step A, adopt unilateral static test, construction simulation the most unfavorable processing condition, namely under simply-supported state, beam operating mode transported by prefabricated case beam bicycle on double width beam, then pass through the Experimental Comparison of step B, select reasonably to load to count, so that follow-up load test result transports beam operating mode closer to reality, then the safety of actual tests is further ensured that again through the simulation of C, unnecessary defect is avoided to occur, the appearance in such as crack, finally carry out actual tests, as stated in the Background Art, highway bridge there is no concrete standard to do this part thing, by this mode, can provide a kind of suitable in the prestressed concrete entire precasting box girders beam of highway bridge is transported beam analog loading test method, make follow-up load test more reasonable, load simultaneously and transport beam operating mode closer to reality.
As the preferred version of the present invention, in step D, in actual loading test, point two loaded cycle carry out, and make final result of the test more accurate, transport beam operating mode closer to reality, ensure the safety of reality fortune beam further.
As the preferred version of the present invention, in step B, described parameter differences includes: the deformation of mid span moment, span centre, fulcrum shearing.
As the preferred version of the present invention, in step B, described parameter differences also includes: quartile moment of flexure, quartile deform, and the contrast more refined, to select loading to count better, in order to follow-up load test result transports beam operating mode closer to reality.
As the preferred version of the present invention, in step B, described loading is counted and is chosen as 7 points, and load(ing) point spacing is 3.856m, the scheme more refined, and is specific to beam car weight 300T, is 35m prefabricated case beam by fortune beam load.
Preferred version as the present invention, in step D, during actual loading test Scheme Choice, the position of the sensor laid in the beam stage processed by the finite element modelling result in step C and described first beam, the arrangement of each measuring point in actual loading test is determined in combination, makes whole process of the test more economical, accurate.
As the preferred version of the present invention, in step D, described 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 version of the present invention, in said two loaded cycle, the first time of first time loaded cycle and second time loaded cycle loads and all starts to load from 0.4 times of plan payload values.
As the preferred version of the present invention, the described first time the highest payload values of loaded cycle is raised to 1 times of size of plan payload values, and the described second time the highest payload values of loaded cycle is raised to 1.1 times of sizes of plan payload values.
Compared with prior art, beneficial effects of the present invention:
There is provided a kind of suitable in the prestressed concrete entire precasting box girders beam of highway bridge is transported beam analog loading test method, make follow-up load test more reasonable, load simultaneously and transport beam operating mode closer to reality.
Accompanying drawing illustrates:
Fig. 1 is the beam-ends section units division figure in the embodiment of the present invention 1 in finite element modelling;
Fig. 2 is the fortune beam load loading position schematic diagram in the embodiment of the present invention 1 in finite element modelling;
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 during in the embodiment of the present invention 1, first time circulation is recorded, short limb edge lateral deflection schematic diagram;
Fig. 8 is during in the embodiment of the present invention 1, first time circulation is recorded, long edge of a wing lateral deflection schematic diagram;
Fig. 9 is during in the embodiment of the present invention 1, second time circulation is recorded, short limb edge lateral deflection schematic diagram;
Figure 10 is during in the embodiment of the present invention 1, second time circulation is recorded, long edge of a wing lateral deflection schematic diagram;
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;
Detailed description of the invention
Below in conjunction with embodiment and detailed description of the invention, the present invention is described in further detail. But this should not being interpreted as, the scope of the above-mentioned theme of the present invention is only limitted to below example, and all technology realized based on present invention belong to the scope of the present invention.
Embodiment 1
Fortune beam analog loading test method on a kind of prestressed concrete entire precasting box girders beam, it is in the construction of highway bridge, construction simulation the most unfavorable processing condition, namely under simply-supported state, beam operating mode transported by prefabricated case beam bicycle on double width beam, in the present embodiment, it is specially Construction of Hangzhou Bay Cross-sea Bridge Hangzhou-Zhejiang high speed connecting line highway engineering, except adopting now sprinkle total box bridge except part, all the other major parts all adopt batch production framing concentration pre-casting box beam, beam is transported beam, the technical scheme of full span erection, for to adopt first in the land conventional highway bridge of China, rely on this engineering, according to prestressed concrete highway bridge simply supported beam dead load bends experiment method, carry out twice static test, to check box beam construction quality and this test method whether feasible, the steps include:
A, the unilateral static test of employing, the load condition of one of them beam in double width beam described in simulation test, sheet beam (the first left width prefabricated case beam of 32.5m end bay headed by this beam, before static test, this beam has completed longitudinal prestressing and has opened eventually and transverse prestress stretch-draw, beam car weight 300T, is considered by 35m prefabricated case beam by fortune beam load), described first beam lays some sensors in the beam stage processed;
B, adopt multipoint excitation mode simulate beam car load, when testing 5 point/11, point/9, point/7 loading respectively, record test beam force-bearing situation and the parameter differences (described parameter differences includes: the deformation of mid span moment, span centre, the deformation of fulcrum shearing, quartile moment of flexure, quartile) under actual beam car effect, the loading contrasting selection differences minimum is counted;
Detailed process is as follows:
Unilateral static test adopts the mode of multipoint excitation to simulate beam car load, when investigating 5 point/11, point/9, point/7 loading respectively, test beam force-bearing situation and the difference under beam car effect, such as table 1 below, list the comparison of key point internal force and deformation, in in table, unit of force is kN, kN.m, and deformation unit is mm.
Table 1 equivalent load internal force, deformation comparison
In form, beam operating mode is equal determines with fortune according to mid span moment for the size of each operating mode payload values, and fortune beam operating mode considers the unbalance loading coefficient of 1.15;Vertical deformation considers the torsional effect calculated by single-beam; During multipoint excitation, point of load application is all calculating equidistant placement in footpath (30.85m);
From table 1, when adopting load at 7, internal force and deformation coincide better with fortune beam operating mode, continuation increase loading is counted and is had little significance and can increase test difficulty, therefore tentatively draft and adopt 7 schemes loaded, load(ing) point spacing is 3.856m, after considering the coefficient of impact of 1.1, the payload values that plan adopts is that 569kN is (owing to prefabricated case beam top board has the horizontal wall inscription of 2%, for ensureing that jack loads steady safety, intend setting gad block at loading Position levelling, voussoir sets shaped steel backing plate again, limit steel bar is laid around gad block, or it is levelling with reference to bearing pad stone way, to ensure the reliability loaded),
In the present embodiment, in conjunction with on-the-spot experimental condition, carrying out static test on the static load pedestal of bale handle station, test adopts resistance to plucking formula static test scheme, and static test pedestal, stand and resistance to plucking connecting device are all computed meeting requirement;
In step B described in C, finite element modelling, selected loading is counted down, the loading condition that test beam is concrete, it is judged that whether stress state is normal;
In the present embodiment, finite element software ANSYS program is adopted to set up space material object unit model, concrete employing SOLID45 unit, steel Shu Caiyong LINK8 unit simulation, as shown in Figure 1. Fortune beam load adopts 7 loadings, and spacing is 3.856m, as shown in Figure 2.
The simulation fortune beam stage, the direct stress distribution on test model, specifically obtain:
1. under simulation fortune beam load action, the deformation of precast beam is less, and maximum distortion is-2.5mm and+7.3mm; 2. except loading and except the stress of support region, precast beam is basic pressurized longitudinally, and controlling sections maximum crushing stress is 6.39MPa; Laterally there is tension in precast beam, is generally present in the lower edge of cantilever root, transverse prestress causes, is generally about 1.50MPa, and controlling sections maximum transversal compressive stress is 8.06MPa. In a word, precast beam stress state under simulation fortune beam load action is normal, and stress can the requirement of design specification.
If stress state described in D step C is normal, (in actual loading test, point two loaded cycle carry out then to carry out actual loading test, the position of the sensor laid in the beam stage processed by the finite element modelling result in step C and described first beam, the arrangement of each measuring point in actual loading test is determined in combination, and described 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, the experimental test control section of vertical, horizontal structural concrete stress is as shown in Figure 3, wherein S1, S2, S4, S5 respectively web variable cross-section place, S3 is span centre section), detection test beam is in the stress state of each testing section, amount of deflection and crack situation.
Concrete 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 shown in Fig. 4 to Fig. 5 in the vertical, horizontal of control section;
2. prefabricated case beam web principal tensile stress is arranged
According to " highway reinforced concrete and prestressed concrete bridge contain design specification " (JTGD62-2004), A class prestressed reinforced concrete component is in effect short-term effect combination, consider the cracking resistance of oblique section, according to calculation simulation analysis, carry out concrete principal tensile stress measuring point and lay;
3. deformation/the deflection test of test component
Amount of deflection point layout is as shown in Figure 6;
With kind highway projects more than Ningbo, (this project adopts the asymmetric entire precasting box girders of large-tonnage to this patent, at precasting yard concentration pre-casting, amount to 774) for background, test in conjunction with twice simulation loading, and use for reference railway standard TB/T2092-2003, summarize a set of suitable in the prestressed concrete entire precasting box girders beam of highway bridge is transported beam analog loading test method;
When loading, under specifically being permitted, the loading of test beam divides two circulations to carry out. Represent that loading grade, loading coefficient K are the ratios of moment of flexure that in load test, beam body span centre bears and design moment with loading coefficient K. It is original state that test preparation terminates the loading status that rear beam body bears.
First loaded cycle process such as Figure 11;
Second loaded cycle process such as Figure 12;
During unilateral static test, predominantly detecting box beam (test beam) in the stress state of each testing section, amount of deflection and crack situation, the collection of test data adopts wireless automatic collecting system;
Test result is as follows,
(1) first time static test;
In the first CYCLIC LOADING process, when load reaches 1.0 grades, the amount of deflection of test beam amount of deflection maximum span centre position is 7.91mm, and deflection span ratio is 1/3900, and when load reaches 1.1 grades, the mid-span deflection of test beam is 8.50mm, and deflection span ratio is 1/3629;
In loading procedure, the nominal growth of each vertical displacement measuring point is similar to linearly, trend stability, it was shown that the stress of beam is in elastic range;
The omnidistance viewing test beam of test does not find the visual defects such as stress crack;
Amount of deflection figure such as Fig. 7,8;
(2) second time static test;
In the second CYCLIC LOADING process, when load reaches 1.0 grades, the amount of deflection of test beam amount of deflection maximum span centre position is 8.93mm, and deflection span ratio is 1/3583, and when load reaches 1.1 grades, the mid-span deflection of test beam is 9.96mm, and deflection span ratio is 1/3213;
In loading procedure, the nominal growth of each vertical displacement measuring point is similar to linearly, trend stability, it was shown that the stress of beam is in elastic range;
The omnidistance viewing test beam of test does not find the visual defects such as stress crack;
Amount of deflection figure such as Fig. 9,10.
Claims (9)
1. transporting a beam analog loading test method on prestressed concrete entire precasting box girders beam, it is in the construction of highway bridge, and construction simulation the most unfavorable processing condition, namely under simply-supported state, beam operating mode transported by prefabricated case beam bicycle on double width beam, the steps include:
Adopting unilateral static test, the load condition of one of them beam in double width beam described in simulation test, sheet beam headed by this beam, described first beam lays some sensors in the beam stage processed;
The mode adopting multipoint excitation simulates beam car load, when testing 5 point/11, point/9, point/7 loading respectively, and the parameter differences under record test beam force-bearing situation and actual beam car effect, the loading contrasting selection differences minimum is counted;
In step B described in finite element modelling, selected loading is counted down, the loading condition that test beam is concrete, it is judged that whether stress state is normal;
If stress state described in step C is normal, then carrying out actual loading test, detection test beam is in the stress state of each testing section, amount of deflection and crack situation.
2. prestressed concrete entire precasting box girders beam according to claim 1 is transported beam analog loading test method, it is characterised in that in step D, in actual loading test, point two loaded cycle carry out.
3. prestressed concrete entire precasting box girders beam according to claim 2 is transported beam analog loading test method, it is characterised in that in step B, described parameter differences includes: the deformation of mid span moment, span centre, fulcrum shearing.
4. prestressed concrete entire precasting box girders beam according to claim 3 is transported beam analog loading test method, it is characterised in that in step B, described parameter differences also includes: quartile moment of flexure, quartile deform.
5. prestressed concrete entire precasting box girders beam according to claim 4 is transported beam analog loading test method, it is characterised in that in step B, described loading is counted and is chosen as 7 points, and load(ing) point spacing is 3.856m.
6. prestressed concrete entire precasting box girders beam according to claim 5 is transported beam analog loading test method, it is characterized in that, in step D, during actual loading test Scheme Choice, the position of the sensor laid in the beam stage processed by the finite element modelling result in step C and described first beam, the arrangement of each measuring point in actual loading test is determined in combination.
7. prestressed concrete entire precasting box girders beam according to claim 6 is transported beam analog loading test method, it is characterised in that in step D, described 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. prestressed concrete entire precasting box girders beam according to claim 7 is transported beam analog loading test method, it is characterized in that, in said two loaded cycle, the first time of first time loaded cycle and second time loaded cycle loads and all starts to load from 0.4 times of plan payload values.
9. prestressed concrete entire precasting box girders beam according to claim 8 is transported beam analog loading test method, it is characterized in that, the described first time the highest payload values of loaded cycle is raised to 1 times of size of plan payload values, and the described second time the highest payload values of loaded cycle is raised to 1.1 times of sizes of plan payload values.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106546495A (en) * | 2016-11-09 | 2017-03-29 | 广西交通科学研究院 | The naked beam Static Load Test Method of Loading Control moment of flexure is determined based on strain |
| CN109183599A (en) * | 2018-08-09 | 2019-01-11 | 中铁大桥勘测设计院集团有限公司 | One kind is asymmetric to choose greatly arm-steel case composite 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 |
| CN110387806A (en) * | 2019-07-31 | 2019-10-29 | 中交路桥北方工程有限公司 | A kind of restressed beam slab deflection deformation control method |
| CN111551326A (en) * | 2020-05-28 | 2020-08-18 | 广西交科集团有限公司 | Displacement monitoring method for settlement foundation layered casting concrete beam |
| CN111859768A (en) * | 2020-07-30 | 2020-10-30 | 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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| 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 |
| CN106546495A (en) * | 2016-11-09 | 2017-03-29 | 广西交通科学研究院 | The naked beam Static Load Test Method of Loading Control moment of flexure 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 |
| CN109183599A (en) * | 2018-08-09 | 2019-01-11 | 中铁大桥勘测设计院集团有限公司 | One kind is asymmetric to choose greatly arm-steel case composite 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 |
| CN110387806A (en) * | 2019-07-31 | 2019-10-29 | 中交路桥北方工程有限公司 | A kind of restressed beam slab deflection deformation control method |
| 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 |
| CN111551326A (en) * | 2020-05-28 | 2020-08-18 | 广西交科集团有限公司 | Displacement monitoring method for settlement foundation layered casting concrete beam |
| 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 |
| CN111859768A (en) * | 2020-07-30 | 2020-10-30 | 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 |
| 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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