CN102914470B - Device and method for testing concrete sample beam stiffness - Google Patents
Device and method for testing concrete sample beam stiffness Download PDFInfo
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- CN102914470B CN102914470B CN201210459679.1A CN201210459679A CN102914470B CN 102914470 B CN102914470 B CN 102914470B CN 201210459679 A CN201210459679 A CN 201210459679A CN 102914470 B CN102914470 B CN 102914470B
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Abstract
The invention belongs to the field of bridge engineering, in particular relates to a device and a method for testing concrete sample beam stiffness and is applied to deducing nominal stiffness EI of a bridge structure. The method comprises the following steps of: vertically fixing steel brackets on the upper surfaces of two ends of a sample beam, respectively arranging longitudinal prestressed steel bars on the sample beam and the steel brackets, and arranging vertical prestressed steel bars which penetrate through the sample beam and the steel brackets on the steel brackets and the sample beam; arranging the sample beam on a support of an in-situ concrete cushion layer, and mounting a displacement meter and a strain gauge at the bottom of the sample beam; and tensioning the vertical prestressed steel bars to fix the steel brackets after the mounting is finished, tensioning the longitudinal prestressed steel bars in the sample beam, tensioning the longitudinal prestressed steel bars on the steel brackets for loading the sample beam, and performing data acquisition. The method has the advantages that the testing steps are simple and convenient, the sample beam stiffness can be measured at high precision, and the nominal stiffness EI of the bridge can be deduced, so that the bridge is better subjected to linear construction control.
Description
Technical field
The invention belongs to science of bridge building field, be specifically related to a kind of for concrete sample beam stiffness test device and test method thereof.
Background technology
Traditional bridge deflection measurement mostly adopts dial gauge or displacement meter directly to measure, at present still widespread use in Bridges in Our Country maintenance, old bridge safety assessment or new bridge are checked and accepted.The advantage of the method is that equipment is simple, and can carry out multiple spot detection, directly obtain the amount of deflection numerical value of each measuring point, measurement result is reliable and stable.But direct measuring method exists a lot of not enough, the method needs to draw steel wire at each measuring point or set up shelf, cannot directly measure so have under bridge during water; For overbridge, due to the impact by railway or highway driving gauge, the method also cannot use; The high bridge of crossing over valley etc. also cannot adopt direct method to measure; Adopt direct method to carry out deflection metrology in addition, no matter lay or cancel instrument, all more numerous and diverse consuming time longer.
When newly building bridge, precompression is applied to beam body and mid-span deflection meeting constantly change under construction loads effect, in order to carry out the control of construction line style better to bridge, be necessary the nominal rigidity EI research experiment to bridge structure.Conveniently test operation, cost-saving, real bridge cross section is equivalent to the comparatively simple concrete sample beam of structure and tests.Conventional test specimen beam generally adopts the reaction frame in testing laboratory to load, and this method requires test specimen beam to be transported to testing laboratory, operates very inconvenient.And the condition of testing laboratory can limit to some extent to test specimen beam size.
For analyzing the stiffness characteristics of actual concrete-bridge, by a certain percentage actual bridge can be reduced and making test specimen beam, loading test being carried out to test specimen beam, the test amount of deflection of bridge and the relation of load.Therefore those skilled in the art be badly in need of a kind of can on test specimen beam Shi Hanzhang carry out loading, can operate at the construction field (site), the technical scheme of the restriction of avoiding testing laboratory to load.
Summary of the invention
The object of the invention is according to above-mentioned the deficiencies in the prior art part, there is provided a kind of for concrete sample beam stiffness test device and test method thereof, this test unit and test method thereof are by longitudinal, vertical tension deformed bar, simultaneously by laying displacement transducer in the bottom of test specimen beam, with the amount of deflection change of observation test specimen beam under load and prestress effect, and infer the nominal rigidity EI of bridge structure according to this.
The object of the invention realizes being completed by following technical scheme:
A kind of for concrete sample beam stiffness test device, it is characterized in that the upper surface two ends of described test specimen beam are vertically fixedly installed steel corbel, described test specimen beam and steel corbel run through respectively longitudinal prestressing reinforcing bar is set, in the bottom of described test specimen beam, longitudinally uniform intervals is provided with displacement transducer, and simultaneously in the bottom of described test specimen beam and side, longitudinally uniform intervals posts foil gauge.
Described test specimen beam and steel corbel arrange longitudinal prestressing reinforcing bar respectively, wherein on described test specimen beam base plate, be at least provided with two longitudinal prestressing reinforcing bars for simulating actual prestressed steel reinforced concrete beam, and be at least symmetrically arranged with two longitudinal prestressing reinforcing bars on the described steel corbel top being arranged at test specimen beam two ends for test specimen beam load application.
Described test specimen beam arranges vertical prestressing bar for steel corbel is fixed on test specimen beam.
Described longitudinal prestressing reinforcing bar two ends to be tightened with backing plate respectively by nut and are fixedly connected with.
A kind of concrete sample beam stiffness test method, relates to above-mentioned test unit, it is characterized in that at least comprising the steps: on the bearing of the smooth concrete cushion described concrete sample beam stiffness test device being positioned over scene; Vertical prestressing bar is set thereafter and fixes steel corbel; The longitudinal prestressing reinforcing bar of stretch-draw test specimen beam, then the stretch-draw of longitudinal prestressing on steel corbel is carried out by lifting jack; While carrying out stretch-draw, gathered the deformation data of concrete sample beam by each displacement transducer, gathered the stress data of concrete sample beam by foil gauge.
Advantage of the present invention is, a test specimen beam can be avoided to be transported to testing laboratory, Shi Hanzhang method on external steel corbel is adopted to load test specimen beam, test operation is easier, high-acruracy survey can go out test specimen beam rigidity, infer the nominal rigidity EI of bridge, more can reflect working-yard situation, thus bridge is carried out to the control of linear construction better.
Accompanying drawing explanation
Fig. 1 is concrete sample beam stiffness test device elevation drawing of the present invention;
Fig. 2 is A-A sectional view of concrete sample beam stiffness test device of the present invention;
Fig. 3 is test specimen beam side view of the present invention;
Fig. 4 is steel bracket structure schematic diagram of the present invention;
Fig. 5 is steel corbel A-A sectional view of the present invention;
Fig. 6 is deformed bar of the present invention and bellows structure schematic diagram.
Embodiment
Feature of the present invention and other correlated characteristic are described in further detail by embodiment below in conjunction with accompanying drawing, so that the understanding of technician of the same trade:
Be respectively as marked 1-14 in Fig. 1-6, figure: steel corbel 1, longitudinal prestressing reinforcing bar 2, test specimen beam 3, vertical prestressed reinforcement 4, displacement transducer 5, longitudinal prestressing reinforcing bar 6, test loading bench 7, reinforcing bar through hole 8, triangular steel plate 9, reinforcing bar through hole 10, nut 11, backing plate 12, spiral bar 13, corrugated tube 14.
Embodiment 1: as illustrated in fig. 1 and 2, the present embodiment belongs to science of bridge building field, is specifically related to a kind of for concrete sample beam stiffness test device and test method thereof, for inferring the nominal rigidity EI of bridge structure.Concrete sample beam stiffness test device forms primarily of test specimen beam 3 and the steel corbel 1 that is arranged at test specimen beam 3 upper surface two ends, and steel corbel 1 is for auxiliary stretch-draw; The base plate of test specimen beam 3 is provided with two longitudinal prestressing reinforcing bars 6, two longitudinal prestressing reinforcing bars 2 are set on the top of steel corbel 1, and the vertical prestressed reinforcement 4 running through both is set on steel corbel 1 and test specimen beam 3; Longitudinally uniform intervals 125cm installation position displacement sensor 5 bottom test specimen beam 3, on longitudinal prestressing reinforcing bar 2, longitudinal prestressing reinforcing bar 6 and vertical prestressed reinforcement 4, uniform intervals is provided with displacement transducer simultaneously; In the bottom of test specimen beam 3 and side, longitudinally uniform intervals posts foil gauge.On test specimen beam 3 base plate, be wherein provided with two longitudinal prestressing reinforcing bars 6 for simulating actual prestressed steel reinforced concrete beam, and be symmetrically arranged with two longitudinal prestressing reinforcing bars 2 on steel corbel 1 top being arranged at test specimen beam 3 two ends for test specimen beam load application.
As seen in figures 3-6, test specimen beam 3 is tee girder body, when the intensity of concrete sample beam 3 reaches more than 90% of design strength and reaches 28 days the concrete length of time, model load test can be carried out, the reinforcing bar of employing when coagulation test specimen beam 3 carries out stiffness test, concrete and deformed bar, should require to be consistent with the reinforcing bar of this bridge of construction, concrete and deformed bar.Between steel corbel 1 and test specimen beam 3, be provided with four road triangular steel plate 9 in order to as stiffening rib, offer two reinforcing bar through holes 8 of vertical direction and two reinforcing bar through holes 10 of horizontal direction on its top.Reinforcing bar through hole 8 and 10 is respectively used to by vertical prestressed reinforcement 4 and longitudinal prestressing reinforcing bar 2, corrugated tube 14 is provided with between described deformed bar and reinforcing bar through hole, the two ends of each deformed bar are all fixed by backing plate 12 and nut 11, and are provided with spiral bar 13 at its both ends; Wherein said each deformed bar adopts the high-strength bar reinforcement of JL25 finish rolling screw thread.
As shown in figures 1 to 6, the test method of above-mentioned concrete sample beam stiffness test device specifically comprises the steps:
1. preparation at the construction site two prestress tensioning equipments and test loading bench 7, test loading bench 7 is specially the bearing of the smooth concrete cushion in working-yard, and wherein said tensioning equipment adopts YCW60B type lifting jack;
2., after treating that concrete sample beam 3 load age reaches 28 days, by crane, test specimen beam 3 is lifted on the test loading bench 7 of level;
3. device to be tested place complete after, first one-end tension is carried out to vertical prestressed reinforcement 4, i.e. its upper end of stretch-draw; Thereafter carry out two ends stretch-draw by the longitudinal prestressing reinforcing bar 6 on jack pair test specimen beam 3 base plate, then carry out two ends stretch-draw by the longitudinal prestressing reinforcing bar 2 on jack pair steel corbel 1 top; Percussion or trample forbidden by reinforcing bar wherein after stretch-draw;
4., while carrying out stretch-draw, gathered the deformation data of concrete sample beam 3 by each displacement transducer, finally carry out data processing.
Embodiment 2: the present embodiment studies the impact of sectional dimension on structure nominal rigidity by by the concrete sample beam stiffness test device described in embodiment 1 and test method thereof, its concrete steps are as follows: this test choose altogether three groups of test specimen beam 3(first group, second group, the 3rd group), the test specimen beam 3 often organizing test is all tee girder, the beam length of each test specimen beam 3 is 5.5m, the ratio of reinforcement of these three groups of test specimen beams 3 is identical, but sectional dimension is different, sectional dimension deck-molding is respectively 50cm, 60cm and 70cm; And be that the test specimen beam of 60cm is as standard specimen beam using deck-molding.According to drawing assembling reinforcement on test site, and formwork erection is used in concreting three groups of test specimen beams 3 of actual bridge same batch, then carries out concrete curing on request; While making test specimen beam 3, make loading system by drawing, namely steel corbel 1, longitudinal prestressing reinforcing bar 2,6 and vertical prestressed reinforcement 4 are set on test specimen beam 3; When the concrete intensity of test specimen beam reaches more than 90% of design strength and reaches 28 days the concrete length of time, can test; Thereafter according to " test method of concrete sample beam stiffness test device " step 1.-4. described in respectively stiffness test is carried out to three groups of test specimen beams 3, the data gathered by displacement transducer 5 study the impact of sectional dimension on structure nominal rigidity.
Embodiment 3: the present embodiment studies the impact of the ratio of reinforcement on structure nominal rigidity by by the concrete sample beam stiffness test device described in embodiment 1 and test method thereof, its concrete steps are as follows: this test choose altogether three groups of test specimen beam 3(the 4th group, the 5th group, the 6th group), the test specimen beam 3 often organizing test is all tee girder, the beam length of each test specimen beam 3 is 5.5m, the sectional dimension of these three groups of test specimen beams 3 is identical is 60cm, but the ratio of reinforcement is different; According to drawing assembling reinforcement on test site, and formwork erection uses concreting three groups of test specimen beams 3 of same batch, then carries out concrete curing on request; While making test specimen beam 3, make loading system by drawing, namely steel corbel 1, longitudinal prestressing reinforcing bar 2,6 and vertical prestressed reinforcement 4 are set on test specimen beam 3; When the concrete intensity of test specimen beam reaches more than 90% of design strength and reaches 28 days the concrete length of time, can test; Thereafter according to " test method of concrete sample beam stiffness test device " step 1.-4. described in respectively stiffness test is carried out to three groups of test specimen beams 3, the data gathered by displacement transducer 5 study the impact of the ratio of reinforcement on structure nominal rigidity.
Claims (5)
1. one kind for concrete sample beam stiffness test device, it is characterized in that the upper surface two ends of described test specimen beam are vertically fixedly installed steel corbel, described test specimen beam and steel corbel run through respectively longitudinal prestressing reinforcing bar is set, in the bottom of described test specimen beam, longitudinally uniform intervals is provided with displacement transducer, and simultaneously in the bottom of described test specimen beam and side, longitudinally uniform intervals posts foil gauge.
2. one according to claim 1 is used for concrete sample beam stiffness test device, it is characterized in that at least being provided with two longitudinal prestressing reinforcing bars for simulating actual prestressed steel reinforced concrete beam on described test specimen beam base plate, and be at least symmetrically arranged with two longitudinal prestressing reinforcing bars on the described steel corbel top being arranged at test specimen beam two ends for test specimen load application.
3. one according to claim 1 is used for concrete sample beam stiffness test device, it is characterized in that on described test specimen beam, arranging vertical prestressing bar for steel corbel is fixed on test specimen beam.
4. one according to claim 1 is used for concrete sample beam stiffness test device, it is characterized in that described longitudinal prestressing reinforcing bar two ends to be tightened with backing plate respectively by nut and is fixedly connected with.
5. a concrete sample beam stiffness test method, uses the arbitrary described device of claim 1-4, it is characterized in that at least comprising the steps: on the bearing of the smooth concrete cushion described concrete sample beam stiffness test device being positioned over scene; Vertical prestressing bar is set thereafter and fixes steel corbel; The longitudinal prestressing reinforcing bar of stretch-draw test specimen beam, then the stretch-draw of longitudinal prestressing reinforcing bar on steel corbel is carried out by lifting jack; While carrying out stretch-draw, gathered the deformation data of concrete sample beam by each displacement transducer, gathered the stress data of concrete sample beam by foil gauge.
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| CN104865128A (en) * | 2015-05-29 | 2015-08-26 | 福州大学 | Device and method for prestressing CFRP (Carbon Fiber Reinforced Plastics) plate in double directions in static test |
| CN105784566A (en) * | 2016-04-26 | 2016-07-20 | 浙江科技学院 | Device and method for monitoring deformation evolution of concrete pores under continuous tension/compression stress |
| CN106124142A (en) * | 2016-08-08 | 2016-11-16 | 中国石油大学(华东) | A kind of nonmetal flexible pipe stiffness measuring method |
| CN111458220B (en) * | 2019-01-18 | 2022-11-15 | 台州学院 | Method for testing transverse bending resistance of small hinge joint hollow slab bridge combined reinforcing member |
| CN111024480B (en) * | 2019-12-31 | 2022-04-01 | 华中科技大学 | Model for simulating concrete stress state and test method |
| CN113502760A (en) * | 2021-07-13 | 2021-10-15 | 华南理工大学 | Be applied to support mound that T constructs bridge and demolishs |
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