CN114965049A - Bidirectional self-balancing opposite-vertex loading device and method for concrete simply supported beam creep test - Google Patents

Bidirectional self-balancing opposite-vertex loading device and method for concrete simply supported beam creep test Download PDF

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Publication number
CN114965049A
CN114965049A CN202210510708.6A CN202210510708A CN114965049A CN 114965049 A CN114965049 A CN 114965049A CN 202210510708 A CN202210510708 A CN 202210510708A CN 114965049 A CN114965049 A CN 114965049A
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China
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loading
channel steel
concrete
frame
concrete simply
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CN202210510708.6A
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Chinese (zh)
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牛艳伟
李晨阳
张岗
牛康康
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Changan University
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Changan University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0001—Type of application of the stress
    • G01N2203/0003—Steady
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G01N2203/0017—Tensile
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G01N2203/0019—Compressive
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
    • G01N2203/0075—Strain-stress relations or elastic constants
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/026—Specifications of the specimen
    • G01N2203/0262—Shape of the specimen
    • G01N2203/0264—Beam

Abstract

The loading device comprises a frame consisting of rod pieces, the top and the bottom of the frame are further provided with a platform used for supporting the concrete simply supported beams through the rod pieces, two concrete simply supported beams are placed on the top platform and the bottom platform of the frame, a pair of bearing channel steel is arranged inside the frame along the height direction, the bearing channel steel is connected together through a stay cable, a jack used for driving the bearing channel steel to move relatively is arranged on the stay cable, and opposite-pull mode or opposite-press mode opposite-loading is applied to the two concrete simply supported beams on the top platform and the bottom platform of the frame through the connected bearing channel steel. The invention only needs to load once through the jack in the test process, the operation process is simple, the load in the loading process is continuous and stable, the long-term stable loading can be provided for four concrete simply supported beam test pieces simultaneously, the test condition is stable, and the limitation of the site is avoided.

Description

Bidirectional self-balancing opposite-vertex loading device and method for concrete simply supported beam creep test
Technical Field
The invention belongs to the field of concrete simply supported beam creep tests, and particularly relates to a bidirectional self-balancing opposite-vertex loading device and method for a concrete simply supported beam creep test.
Background
The deformation of the bridge structure and the redistribution of internal force caused by concrete creep are a difficult point in the construction control process, so the creep test of the concrete needs to be designed and completed before the construction of the bridge structure.
When the constant-load long-term-action creep characteristic test research of the concrete simple-supported beam is carried out on the highway bridge, the test is carried out by adopting the reinforced concrete small beam, the reinforced concrete simple-supported beams in different ages are subjected to long-term loading, a four-point bending test can be adopted in the test, a dial gauge is used as a deflection measuring instrument, the strain change of the concrete beam is observed through a strain gauge and a static strain gauge, and the test method can only carry out single-beam test.
Patent application with publication number CN 101526434A provides a loading device that carries out concrete simple beam creep test through lever principle, uses jack to exert constant load to the framework, can solve the problem that load time is longer and the loading is unbalanced in the creep loading test, but can only carry out continuous loading to the monolithic roof beam usually, and needs the counter-force rigid frame as balanced structure, and overall structure is comparatively complicated, and occupation area is big.
Patent application with publication number CN 214173967 provides a crooked creep test device of invariable loading of self-balancing, passes through the screw-thread steel to the bearing plate and carries out the loading to two concrete samples, and the cover is established elastomeric element and is carried out automatic benefit on the screw-thread steel, and overall structure can reach the self-balancing. However, the loading system can only load two concrete test pieces, and the support between the test pieces is unstable, so that the test pieces are easy to dislocate in actual operation, and the feasibility is not high.
[1] Study of creep test for pure-curved concrete beams [ J ]. proceedings of university of Wuhan Dynasty, 2003,27(4): 489-.
[2] The master is a concrete component creep test loader [ P ]. china: CN 101526434A,2009-9-9.
[3] Zhenghui, Ou Ming Fu, self-balancing constant loading bending creep test device [ P ]. China: CN 214173967,2021-9-10.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a bidirectional self-balancing opposite-jacking loading device and method for a concrete simply supported beam creep test.
In order to achieve the purpose, the invention has the following technical scheme:
a bidirectional self-balancing opposite-top loading device for a concrete simply supported beam creep test comprises a cuboid structural frame consisting of rod pieces, wherein platforms for supporting the concrete simply supported beam are further arranged at the top and the bottom of the frame through the rod pieces, two concrete simply supported beams are respectively placed on the top platform and the bottom platform of the frame, and the long edge of the frame is parallel to the long edge of the concrete simply supported beam; the pair of bearing channel steel is arranged in the frame along the height direction, the pair of bearing channel steel is connected together through a stay cable, a jack used for driving the bearing channel steel to move relatively is arranged on the stay cable, and the pair of bearing channel steel connected together applies opposite-pull loading or opposite-press loading of a mode to two concrete simply-supported beams on a top platform and a bottom platform of the frame.
As a preferred embodiment of the bidirectional self-balancing opposite-top loading device of the present invention, the platform for supporting the concrete simply-supported beam includes platform rods respectively arranged in parallel with the long side and the wide side of the frame, the platform rods are connected with the rods on the high side of the frame, and further includes rods parallel with the wide side of the frame and supported below the two ends of the concrete simply-supported beam.
As a preferred scheme of the bidirectional self-balancing opposite-top loading device, when opposite-pull mode opposite-top loading is applied to the concrete simple-supported beams, separation channel steel is arranged between the two concrete simple-supported beams on the top platform and the bottom platform of the frame, the separation channel steel comprises two first channel steel arranged along the height direction, the two first channel steel are arranged at two ends of the long edge direction of the frame, the two first channel steel are connected through a second channel steel, and opposite-top loading is applied to the concrete simple-supported beams through the front surfaces of the bearing channel steel and the two side surfaces of the first channel steel; the top platform and the bottom platform that the second channel-section steel corresponds the frame set up two, all are provided with sensor installation pole on two second channel-section steels, install displacement sensor and load sensor on the sensor installation pole.
As a preferred scheme of the bidirectional self-balancing opposite-top loading device, hemispherical supporting devices are arranged on the surfaces, contacting the concrete simply-supported beam, of the bearing channel steel and the first channel steel.
As a preferred scheme of the bidirectional self-balancing opposite-jacking loading device, the jack is installed at one end of the inhaul cable, the tail of the jack is supported by the spring, the head of the jack is connected with one of the bearing channel steel, and the other bearing channel steel is used for fixing the position through the anchoring device arranged on the inhaul cable.
As a preferred scheme of the bidirectional self-balancing opposite-jacking loading device, when a concrete simple-supported beam is subjected to opposite-pressure mode opposite-jacking loading, a pair of bearing channel steel is arranged between two concrete simple-supported beams on a top platform and a bottom platform of a frame, and the jack is arranged between the pair of bearing channel steel; the two ends of two concrete simply-supported beams on the top platform and the bottom platform are sleeved together through two pairs of hoops respectively, and each pair of hoops are connected into a whole through a connecting rod arranged along the long edge direction of the frame.
As a preferred scheme of the bidirectional self-balancing opposite-top loading device, a hemispherical supporting device is arranged on the surface of the bearing channel steel, which is in contact with the concrete simply-supported beam.
As a preferred scheme of the bidirectional self-balancing opposite-jacking loading device, the embedded part of the bearing channel steel is provided with a groove through a welded steel plate, and the jack is arranged between the grooves of the two bearing channel steels; and a displacement sensor and a load sensor are arranged on the connecting rod.
A loading method of a bidirectional self-balancing opposite-top loading device based on a concrete simply supported beam creep test comprises the following steps:
a pull-pair mode opposite-top loading test step:
mounting two pairs of concrete simply supported beams on a top platform and a bottom platform of the frame respectively;
preloading is carried out by using a jack, the whole deformation of the device is observed, and formal loading is carried out if the stress of the structure is stable;
the jack is used for formal loading, the load generated by loading is transmitted to the bearing channel steel through the inhaul cable, opposite loading is applied to the concrete simply-supported beam through the front surface of the bearing channel steel and the surfaces of the two sides of the first channel steel, and as the hemispherical supporting devices are arranged on the surfaces, which are in contact with the concrete simply-supported beam, of the bearing channel steel and the first channel steel, the three-point loading on the concrete simply-supported beam is completed through the hemispherical supporting devices;
measuring tension strain data of two concrete simply supported beams on a top platform and a bottom platform of a frame, taking logarithmic coordinates of time as data of a horizontal axis, and taking the recorded tension strain data of the concrete simply supported beams as data of a vertical axis, and drawing a concrete beam creep curve;
a pressure-opposite mode top-opposite loading test step:
two pairs of concrete simply-supported beams are respectively installed on a top platform and a bottom platform of the frame, and two ends of the two concrete simply-supported beams on the top platform and the bottom platform are respectively sleeved together through two pairs of hoops;
preloading is carried out by using a jack, the whole deformation of the device is observed, and formal loading is carried out if the stress of the structure is stable;
the jack is used for formal loading, the load generated by loading is transmitted to the pair of bearing channel steel through the inhaul cable, opposite loading is applied to the concrete simply-supported beam through the front surface of the bearing channel steel and the inner side surfaces of the two pairs of hoops, and as the hemispherical supporting device is arranged on the surface of the bearing channel steel, which is in contact with the concrete simply-supported beam, three-point loading on the concrete simply-supported beam is completed through the hemispherical supporting device and the two pairs of hoops;
and measuring compressive strain data of the two concrete simply supported beams on the top platform and the bottom platform of the frame, taking logarithmic coordinates of time as data of a horizontal axis, and taking the recorded compressive strain data of the concrete simply supported beams as data of a vertical axis, and drawing a creep curve of the concrete beams.
As a preferable scheme of the loading method, tension strain data or compression strain data of two concrete simply supported beams on a top platform and a bottom platform of a frame are measured through a load sensor and a displacement sensor, and the load sensor and the displacement sensor are opened before a jack is used for loading so as to completely measure data.
Compared with the prior art, the invention at least has the following beneficial effects:
the conventional creep loading device for the concrete simple-supported beams cannot load a plurality of concrete samples at the same time, but the device provided by the invention is used as a loading system under the driving action of a jack, a stay cable penetrates through an opening of a bearing channel steel, the bearing channel steel is pressurized in a counter-pulling mode or a counter-pressing mode, and the jack is only required to load once in the test process, so that the counter-top loading can be simultaneously provided for four concrete simple-supported beams on a top platform and a bottom platform of a frame. The integral component of the invention forms a self-balancing structure through the stay cable and the channel steel, has simple operation process, does not need to use a reaction frame, can simultaneously provide long-term stable loading for four concrete simply supported beam test pieces through the continuous loading of a loading system, saves the field and can solve the field limitation problem.
Furthermore, when opposite-pull mode opposite-top loading is applied to the concrete simple-supported beams, the separating channel steel between the two concrete simple-supported beams comprises two first channel steel arranged along the height direction and two second channel steel connected with the two first channel steel, the two second channel steel are arranged corresponding to the top platform and the bottom platform of the frame, the two second channel steel are respectively provided with a sensor mounting rod, the sensor mounting rods are provided with displacement sensors and load sensors, creep data are recorded through the load sensors and the displacement sensors, and the test is convenient. Install the jack in the one end of cable, the afterbody of jack supports through the spring, and the head of jack is connected with one of them load channel-section steel, uses high strength spring fastening cable, prevents that the cable from appearing lax.
Drawings
FIG. 1 is a three-dimensional schematic view of a frame structure of the present invention consisting of rods;
FIG. 2 is a three-dimensional schematic view of an integral assembly structure of the concrete simply supported beam under opposite-top loading in an opposite-pull mode;
FIG. 3 is a schematic view of a three-dimensional structure of the device for applying a counter-pulling mode of counter-top loading to a concrete simply supported beam according to the present invention;
FIG. 4 is a top view of the overall assembly structure of the present invention applying a counter-pulling mode of counter-top loading to a concrete simply supported beam;
FIG. 5 is a schematic side view of the apparatus for applying a counter-pulling mode of counter-top loading to a concrete simply supported beam according to the present invention;
FIG. 6 is a schematic view of a three-dimensional structure of the device for applying a counter-pressure mode of counter-top loading to a concrete simply supported beam according to the present invention;
FIG. 7 is a three-dimensional schematic view of an integral assembly structure of the invention when a counter-pressure mode counter-top loading is applied to a concrete simply supported beam;
FIG. 8 is a schematic structural view of a pair of hoops under a counter-pressure mode of counter-top loading applied to a concrete simply supported beam according to the present invention;
FIG. 9 is a top view of the overall assembly structure of the present invention applying a counter-pressure mode of counter-top loading to a concrete simply supported beam;
FIG. 10 is a schematic side view of the apparatus for applying a counter-pressure mode of counter-top loading to a concrete simply supported beam according to the present invention;
in the drawings: 1-a frame; 2-a spring; 3-a jack; 4-bearing channel steel; 5-a pull rope; 6-anchoring means; 7-a hemispherical support; 8-concrete simply supported beam; 9-sensor mounting rod; 10-a second channel steel; 11-a first channel steel; 12-a connecting rod; 13-cuff.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the bidirectional self-balancing opposite-top loading device for the concrete simple-supported beam creep test comprises a frame 1 consisting of rod pieces, wherein platforms for supporting the concrete simple-supported beams 8 are further arranged at the top and the bottom of the frame 1 through the rod pieces, two concrete simple-supported beams 8 are respectively placed on the top platform and the bottom platform of the frame 1, as shown in fig. 2 and 7, a pair of bearing channel steel 4 is arranged inside the frame 1 along the height direction, the bearing channel steel 4 is connected together through a guy cable 5, a jack 3 for driving the bearing channel steel 4 to move relatively is arranged on the guy cable 5, and opposite-top loading in an opposite-pull mode or an opposite-press mode is simultaneously applied to the two concrete simple-supported beams 8 on the top platform and the bottom platform of the frame 1 through the bearing channel steel 4 which are connected together.
In an alternative embodiment, as shown in fig. 1, the frame 1 composed of the rods is a rectangular parallelepiped structure, and the long sides of the frame 1 are parallel to the long sides of the concrete simple beams. As shown in fig. 2 and 7, the platform for supporting the concrete simply supported beam includes platform rods respectively arranged in parallel with the long sides and the wide sides of the frame 1, the platform rods are connected with the rods on the high sides of the frame 1, and rods parallel with the wide sides of the frame 1 and supported below the two ends of the concrete simply supported beam are used as supporting cross arms.
Referring to fig. 2-5, when applying the opposite-pull mode to the concrete simple-supported beam, set up between two concrete simple-supported beams on the top platform of frame 1 and the bottom platform and separate the channel-section steel, separate the channel-section steel and include two first channel-section steels 11 that set up along the direction of height, two first channel-section steels 11 set up the both ends at the long limit direction of frame 1, connect through second channel-section steel 10 between two first channel-section steels 11, apply the opposite-pull loading to the concrete simple-supported beam through the front of load channel-section steel 4 and the both sides surface of first channel-section steel 11. As shown in fig. 4, hemispherical supporting devices 7 are arranged on the surfaces of the bearing channel steel 4 and the first channel steel 11, which are in contact with the concrete simply supported beam. The jack 3 is installed in the one end of cable 5, and the afterbody of jack 3 supports through spring 2, and the head of jack 3 is connected with one of them load channel-section steel 4, and another load channel-section steel 4 is fixed the position through setting up anchor 6 on cable 5. As shown in fig. 2 and 3, the second channel steel 10 is provided with two top platforms and two bottom platforms corresponding to the frame 1, the two second channel steels 10 are both provided with sensor installation rods 9, and the sensor installation rods 9 are provided with displacement sensors and load sensors.
Referring to fig. 6-10, when the concrete simple-supported beams are subjected to opposite-pressure mode opposite-top loading, a pair of bearing channel steel 4 is arranged between the two concrete simple-supported beams on the top platform and the bottom platform of the frame 1, and the jack 3 is arranged between the pair of bearing channel steel 4. As shown in fig. 7 and 8, two ends of two concrete simply supported beams on the top platform and the bottom platform are respectively sleeved together by two pairs of hoops 13, and each pair of hoops 13 are connected into a whole by a connecting rod 12 arranged along the long side direction of the frame 1. As shown in fig. 9, the surface of the bearing channel steel 4 contacting the concrete simply supported beam is provided with a hemispherical supporting device 7.
Based on the self-balancing opposite-top loading device, the opposite-top loading process of simultaneously applying an opposite-pulling mode or an opposite-pressing mode to the two concrete simply-supported beams 8 on the top platform and the bottom platform of the frame 1 is as follows:
firstly, mounting a split-type opposite-top loading test device:
1. the installation frame 1, frame 1 comprises square steel member, adopts from bottom to top installation mode, adopts the bolt to connect between each member. The square steel at the lower part is firstly installed on a flat ground, and the square steel at the middle part and the square steel at the upper part are sequentially installed. The final mounting effect is the frame structure shown in fig. 1.
2. And mounting a bearing channel steel 4. A hole is arranged at the middle position of the two bearing channel steel 4, so that the inhaul cable 5 can pass through the hole. And temporarily fixing the bearing channel steel 4 in a binding mode.
3. And installing a guy cable 5, penetrating the guy cable 5 through the opening in the middle of the two bearing channel steel 4, and sequentially installing a jack 3, an anchoring device 6 and a spring 2.
4. And installing a second channel steel 10 and a first channel steel 11. The second channel steel 10 and the first channel steel 11 are installed in a welding mode to form a measuring platform, and the stability of the creep testing device is guaranteed.
5. And a sensor mounting rod 9 is welded and fixed on the upper second channel steel 10 and the lower second channel steel 10.
6. And a hemispherical supporting device 7 is arranged on the force bearing channel steel 4, the second channel steel 10 and the first channel steel 11 according to the positions shown in the figure so as to ensure the boundary condition and the concentrated force loading of the support.
7. And checking the connection part to finish the installation of the testing device. And at the moment, the installation of the self-balancing opposite-top loading device is completed.
Secondly, using the opposite-pull mode opposite-top loading test device:
1. and installing the formed and aged concrete simply supported beam 8 at four positions corresponding to the frame structure.
2. A displacement sensor and a load sensor are mounted on the sensor mounting rod 9.
3. And adjusting the positions of the concrete simply supported beams 8 and the hemispherical supporting devices 7.
4. And (5) preloading is carried out by using the jack 3, the test device is observed at the moment, and formal loading in the step 5 is carried out if the whole structure is slightly deformed after being stressed and the structure is stably stressed. The stability of the force transmission system is guaranteed through preloading, and the accuracy of test data is guaranteed.
5. The jack 3 is used for pressurizing, the load is transmitted to the bearing channel steel 4 through the inhaul cable, and the bearing channel steel 4 completes three-point loading on the concrete simply supported beam 8 through the hemispherical supporting device 7.
6. Before the jack 3 is used for pressurization, the load sensor and the displacement sensor are started immediately to ensure the integrity of test data.
7. And (4) drawing a concrete beam creep curve by using the test data, taking the logarithmic coordinate of time as a horizontal axis and the recorded data of the tensile strain of the test piece as a vertical axis.
Thirdly, installing the opposite-pressing mode opposite-top loading test device:
1. the frame 1 is mounted. The frame 1 structure is composed of square steel rods, and adopts a bottom-up installation mode, and all the rods are connected by bolts. The square steel at the lower part is firstly installed on a flat ground, and the square steel at the middle part and the square steel at the upper part are sequentially installed.
2. And mounting a bearing channel steel 4. The bearing channel steel 4 is temporarily fixed in a binding mode. And a groove is arranged at the embedded part of the bearing channel steel 4 in a way of welding a steel plate.
3. The jack 3 is installed. The jack 3 is arranged between the grooves of the two bearing channel steels 4.
4. And installing the formed and aged concrete simply supported beam 8 at four positions corresponding to the frame structure.
5. A ferrule 13 and a link 12 are mounted. Hoops made of square steel are connected through bolts and are installed on the concrete simply supported beam 8 installed in the step 4, and connecting rods 12 are welded to two sides of the hoops 13.
6. And a hemispherical supporting device 7 is arranged at the position of the bearing channel steel 4 according to the figure 6 so as to ensure concentrated force loading.
7. And checking the connection part to finish the installation of the testing device. At this point the self-balancing frame is installed.
Fourthly, using the opposite-pressing mode opposite-top loading test device:
1. the concrete simple beams 8 have been placed during the installation of the structure.
2. A displacement sensor and a load sensor are mounted on the connecting rod 12.
3. And adjusting the positions of the concrete simply supported beams 8 and the hemispherical supporting devices 7.
4. And (5) preloading by using the jack 3, observing the test device at the moment, and carrying out formal loading in the step 5 if the whole structure is slightly deformed after being stressed and the structure is stably stressed. The stability of the force transmission system is guaranteed through preloading, and the accuracy of test data is guaranteed.
5. The jack 3 is used for pressurizing, the load is transmitted to the bearing channel steel 4, and the bearing channel steel 4 completes three-point loading on the concrete beam 8 through the hemispherical supporting device 7 and the hoop 13.
6. Before the jack 3 is used for pressurization, the load sensor and the displacement sensor are started immediately to ensure the integrity of test data.
7. And (4) drawing a creep curve of the concrete beam by using the test data and taking the logarithmic coordinate of time as a horizontal axis and the recorded data of the tensile strain of the test piece as a vertical axis.
The bidirectional self-balancing opposite-top loading device and method provided by the invention are based on the purpose of carrying out long-term constant loading on a plurality of concrete simple-supported beams 8, a mode that the bearing channel steel 4 is provided with a hole to penetrate through the stay cable 5 in the opposite-pull mode of the test device is used as a loading system, the bearing channel steel 4 is pressurized in the opposite-press mode of the test device, opposite-top loading can be provided for the four concrete simple-supported beams 8, and the upper and lower concrete simple-supported beams 8 are supported by the hemispherical support 7 device. In the opposite pulling mode of the test device, the high-strength spring 2 is arranged at the tensioning end of the inhaul cable 5 to prevent the inhaul cable 5 from loosening in the loading process. The creep process is measured using a load sensor and a displacement sensor. The device provided by the invention has the advantages of simple operation process, continuous and stable load in the loading process, stable support among concrete samples, capability of loading four concrete samples simultaneously, no need of a reaction frame, less site limitation and the like.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.

Claims (10)

1. The bidirectional self-balancing opposite-top loading device for the concrete simply supported beam creep test is characterized by comprising a cuboid structural frame (1) consisting of rod pieces, wherein platforms for supporting the concrete simply supported beams (8) are further arranged at the top and the bottom of the frame (1) through the rod pieces, the two concrete simply supported beams (8) are respectively placed on the top platform and the bottom platform of the frame (1), and the long edges of the frame (1) are parallel to the long edges of the concrete simply supported beams; the high-strength concrete butt-pull loading device is characterized in that a pair of bearing channel steel (4) is arranged inside a frame (1) along the height direction, the bearing channel steel (4) is connected together through a stay cable (5), a jack (3) used for driving the bearing channel steel (4) to move relatively is arranged on the stay cable (5), and the butt-pull loading or the butt-press loading of a butt-pull mode or a butt-press mode is applied to two concrete simply-supported beams (8) on a top platform and a bottom platform of the frame (1) through the connected bearing channel steel (4).
2. The bidirectional self-balancing opposite-vertex loading device for the concrete simply supported beam creep test according to claim 1, is characterized in that: the platform for supporting the concrete simply supported beam comprises platform rods which are respectively arranged in parallel with the long edge and the wide edge of the frame (1), the platform rods are connected with the rods on the high edge of the frame (1), and the platform for supporting the concrete simply supported beam also comprises rods which are parallel with the wide edge of the frame (1) and are supported below two ends of the concrete simply supported beam.
3. The bidirectional self-balancing opposite-vertex loading device for the concrete simply supported beam creep test according to claim 1, is characterized in that: when opposite-pull mode opposite-top loading is applied to the concrete simple-supported beam, a separation channel steel is arranged between two concrete simple-supported beams (8) on a top platform and a bottom platform of a frame (1), the separation channel steel comprises two first channel steel (11) arranged along the height direction, the two first channel steel (11) are arranged at two ends of the long edge direction of the frame (1), the two first channel steel (11) are connected through a second channel steel (10), and opposite-top loading is applied to the concrete simple-supported beam (8) through the front surface of a bearing channel steel (4) and the surfaces of two sides of the first channel steel (11); the top platform and the bottom platform of second channel-section steel (10) correspondence frame (1) set up two, all are provided with sensor installation pole (9) on two second channel-section steels (10), install displacement sensor and load sensor on sensor installation pole (9).
4. The bidirectional self-balancing opposite-vertex loading device for the concrete simply supported beam creep test according to claim 3, is characterized in that: and hemispherical supporting devices (7) are arranged on the surfaces of the bearing channel steel (4) and the first channel steel (11) which are in contact with the concrete simply supported beam.
5. The bidirectional self-balancing opposite-vertex loading device for the concrete simply supported beam creep test according to claim 3, is characterized in that: jack (3) install the one end in cable (5), the afterbody of jack (3) supports through spring (2), the head of jack (3) is connected with one of them load channel-section steel (4), another load channel-section steel (4) are fixed the position through anchor (6) that set up on cable (5).
6. The bidirectional self-balancing opposite-vertex loading device for the creep test of the concrete simply supported beam according to claim 1, characterized in that: when the concrete simply supported beams are subjected to opposite-pressure mode opposite-top loading, a pair of bearing channel steel (4) is arranged between the two concrete simply supported beams on the top platform and the bottom platform of the frame (1), and the jack (3) is arranged between the pair of bearing channel steel (4);
two ends of two concrete simply-supported beams on the top platform and the bottom platform are respectively sleeved together through two pairs of hoops (13), and each pair of hoops (13) are connected into a whole through a connecting rod (12) arranged along the long edge direction of the frame (1).
7. The bidirectional self-balancing opposite-vertex loading device for the concrete simply supported beam creep test according to claim 6, is characterized in that: and a hemispherical supporting device (7) is arranged on the surface of the bearing channel steel (4) contacting with the concrete simply supported beam.
8. The bidirectional self-balancing opposite-vertex loading device for the concrete simply supported beam creep test according to claim 6, is characterized in that: the embedded part of the bearing channel steel (4) is provided with a groove through a welded steel plate, and the jack (3) is arranged between the grooves of the two bearing channel steels (4); and a displacement sensor and a load sensor are arranged on the connecting rod (12).
9. A loading method of a bidirectional self-balancing opposite-top loading device based on a concrete simply supported beam creep test according to any one of claims 1 to 8, which is characterized by comprising the following steps:
a pull-pair mode opposite-top loading test step:
two pairs of concrete simply supported beams (8) are respectively installed on a top platform and a bottom platform of the frame (1);
preloading is carried out by using a jack (3), the whole deformation of the device is observed, and formal loading is carried out if the stress of the structure is stable;
the jack (3) is used for formal loading, the load generated by loading is transmitted to the bearing channel steel (4) through the inhaul cable (5), the opposite-top loading is applied to the concrete simply supported beam (8) through the front surface of the bearing channel steel (4) and the surfaces of the two sides of the first channel steel (11), and as the hemispherical supporting devices (7) are arranged on the surfaces, which are in contact with the concrete simply supported beam, of the bearing channel steel (4) and the first channel steel (11), the three-point loading on the concrete simply supported beam (8) is completed through the hemispherical supporting devices (7);
measuring tensile strain data of two concrete simply supported beams (8) on a top platform and a bottom platform of a frame (1), taking logarithmic coordinates of time as data of a horizontal axis, and taking the recorded tensile strain data of the concrete simply supported beams (8) as data of a vertical axis to make a concrete beam creep curve;
a pressure-opposite mode top-opposite loading test step:
two pairs of concrete simply-supported beams (8) are respectively arranged on a top platform and a bottom platform of the frame (1), and two ends of the two concrete simply-supported beams on the top platform and the bottom platform are respectively sleeved together through two pairs of hoops (13);
preloading is carried out by using a jack (3), the whole deformation of the device is observed, and formal loading is carried out if the stress of the structure is stable;
the jack (3) is used for formal loading, the load generated by loading is transmitted to the pair of bearing channel steel (4) through the inhaul cable (5), the opposite loading is applied to the concrete simply-supported beam (8) through the front surface of the bearing channel steel (4) and the inner side surfaces of the two pairs of hoops (13), and as the bearing channel steel (4) is in contact with the surface of the concrete simply-supported beam, the hemispherical supporting device (7) is arranged, and the three-point loading of the concrete simply-supported beam (8) is completed through the hemispherical supporting device (7) and the two pairs of hoops (13);
and measuring compressive strain data of the two concrete simply supported beams (8) on the top platform and the bottom platform of the frame (1), taking logarithmic coordinates of time as data of a horizontal axis, and taking the recorded compressive strain data of the concrete simply supported beams (8) as data of a vertical axis, and drawing a creep curve of the concrete beams.
10. A loading method according to claim 9, characterized in that the tensile strain data or compressive strain data of the two concrete simple beams (8) on the top platform and the bottom platform of the frame (1) are measured by load sensors and displacement sensors which are turned on before loading with the jack (3) to complete the measurement data.
CN202210510708.6A 2022-05-11 2022-05-11 Bidirectional self-balancing opposite-vertex loading device and method for concrete simply supported beam creep test Pending CN114965049A (en)

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