CN108168870B - Device and method suitable for testing fatigue performance of anchor connector - Google Patents
Device and method suitable for testing fatigue performance of anchor connector Download PDFInfo
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- CN108168870B CN108168870B CN201810063326.7A CN201810063326A CN108168870B CN 108168870 B CN108168870 B CN 108168870B CN 201810063326 A CN201810063326 A CN 201810063326A CN 108168870 B CN108168870 B CN 108168870B
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Abstract
The invention discloses a device and a method suitable for testing fatigue performance of an anchorage connector. The fatigue testing device comprises an I-shaped internal framework, anchors positioned on two outer end faces of the internal framework, an external connecting component used for connecting the internal framework and the fatigue testing machine, and a strain gauge connected with an external monitoring system. The invention simulates the actual working state of the anchor connector under the dynamic load by preparing the steel strand, building an internal framework, penetrating and installing the steel strand, anchoring the steel strand, installing an external connection assembly, connecting a fatigue testing machine, a loading method and an assembly method for performing fatigue testing, and strain gauges arranged at the detection position of the anchor connector according to requirements for monitoring the stress value in real time and collecting data, has the characteristics of stable test quality, high universality, low test cost and simple operation, and provides reliable technical basis and technical service for judging the fatigue performance state of the anchor connector and testing and researching the fatigue life.
Description
Technical Field
The invention belongs to the technical field of testing, and particularly relates to a device and a method suitable for testing fatigue performance of an anchorage connector.
Background
With the development of innovation, the national economy is greatly improved, and the infrastructure also enters the rapid development period. In the foundation construction, the prestressed concrete works have become the main force, and the anchor connectors are required to be widely used in the prestressed concrete works, and the role of the anchor connectors is increasingly prominent. Especially in post-tensioning structures or elements, the anchor connectors are not disengaged in order to maintain the tension of the tendons and to transmit the tension to the concrete interior. Anchorage connectors used in dynamic load construction projects (such as bridge works, high-speed rail, subways, etc.) must be required to have acceptable fatigue performance (standard compliance with GB/T14370-2015 and TB/T3193-2016), as the fatigue performance of the anchorage connector is related to the service life and operational safety of the construction. The fatigue performance test of the anchorage connector in the active service of China is lack of corresponding technical support and technical means, the definition of related standards is not clear, and most of the technologies refer to foreign countries and are limited by people. At present, the fatigue performance test of the anchor connector mainly utilizes a fatigue testing machine to directly connect the anchor connector for testing, and the active test method has the following defects: the universality is poor, the test quality is unstable, a special test platform needs to be built, and the test cost is high. Therefore, it is an urgent need to solve the technical problem to search a device and a method thereof suitable for testing fatigue performance of an anchor connector.
Disclosure of Invention
The present invention is directed to the above-mentioned deficiencies of the prior art and to a method and apparatus for fatigue testing of an anchor connector. The testing device and the testing method have the advantages of high universality, stable testing quality, low testing cost and simple operation, provide real-time and accurate analysis data for exploring the correlation between the stress state and the failure, and provide reliable technical basis and technical service for judging the fatigue performance state of the anchor connector and testing and researching the fatigue life.
The object of the invention can be achieved by the following technical measures:
the device suitable for the anchorage connector to carry out fatigue performance test comprises an I-shaped internal framework, anchorages positioned on two outer end faces of the internal framework, an external connection component used for connecting the internal framework and a fatigue tester, and a strain gauge connected with an external monitoring system; the internal framework is an I-shaped structure formed by uniformly supporting and fixing a plurality of same pre-tensioned supporting rods between two fixed supporting plates with the same structure through positioning bolts; the anchor device is composed of an anchor plate with a plurality of conical holes and a clamping piece inserted in the conical holes of the anchor plate, the inner cavity of the clamping piece is a cylindrical hole, the shape of the clamping piece is a cone frustum structure, and the cone frustum taper of the clamping piece is the same as that of the conical holes of the anchor plate (when the anchor device is under the action of external tensile force, the clamping piece with the same taper and the anchor plate are fastened through self-locking); the external connecting component comprises an upper clamping plate, a clamping handle embedded in the center of the upper clamping plate, a limiting sleeve supported between the upper clamping plate and the fixed supporting plate, and a connecting bolt penetrating in an inner cavity of the limiting sleeve and used for connecting the upper clamping plate and the fixed supporting plate (the external connecting component not only realizes firm connection with an internal framework through the connecting bolt and the limiting sleeve, but also ensures synchronous stress and uniform stress of each steel strand in the anchorage device, and meanwhile, the external connecting component is connected with the fatigue testing machine through the clamping handle).
In the invention, a steel strand penetrating hole is formed in the center of the fixed supporting plate, and the inner diameter of the steel strand penetrating hole is smaller than the outer diameter of the anchor plate (so that the anchor plate can be pressed on the outer end surface of the fixed supporting plate, and the pre-tensioning supporting rod supports the outward-conducted supporting force of the fixed supporting plate and the inward tension of the prestressed steel strand on the anchor device to balance to form the prestress of the anchor device); threaded holes with the number and the specification matched with the connecting bolts are uniformly distributed around the steel strand penetrating holes; a plurality of unthreaded holes which are used for installing positioning bolts and are provided with relative sliding gaps are uniformly distributed on the fixed supporting plate between the threaded holes and the steel strand penetrating holes and around the steel strand penetrating holes (the unthreaded holes can realize the free sliding of the relative small gaps between the positioning bolts and the fixed supporting plate in the fatigue test process, so that the pre-tensioned supporting rod is prevented from reversely generating test resistance, and the test tension is ensured to completely act on the anchorage device through the steel strand).
In the invention, threaded blind holes matched with the positioning bolts are formed at both ends of the pre-tensioning support rod (after the threaded blind holes are combined with the positioning bolts, the pre-tensioning support rod and the fixed support plates at both ends are connected into a whole to build an internal framework of the testing device).
The upper clamping plate is provided with a bolt penetrating unthreaded hole matched with the connecting bolt.
In the invention, the end faces of the opposite ends of the upper clamping plate and the fixed supporting plate are respectively provided with an inner sunken groove for positioning the limiting sleeve (the limiting sleeve is positioned in the inner sunken groove, so that the influence of the rotating shearing force during the test can be avoided).
The number of the positioning bolts and the number of the connecting bolts are four (synchronous stress and uniform stress are ensured).
A method for fatigue performance testing of an anchor connector using the apparatus of the present invention, said method comprising the steps of:
A. preparing a steel strand: determining the length of the steel strand according to the lengths of the testing device and the high-voltage loading device, determining the number of the steel strands according to the performance parameters of the fatigue testing machine, and cutting the required steel strand;
B. building an internal framework: one ends of four pre-tensioning support rods are connected with one fixed support plate through four positioning bolts, and the other ends of the four pre-tensioning support rods are connected with the other fixed support plate through the other four positioning bolts to build an I-shaped internal framework; the threaded section of the positioning bolt is screwed into the threaded blind hole corresponding to the end of the pre-tensioned support rod, and the positioning bolt can freely slide in the unthreaded hole in a small gap relative to the fixed support plate (so that the pre-tensioned support rod is prevented from reversely generating test resistance, and the test tension is ensured to completely act on the anchorage device through the steel strand);
C. threading and installing steel strands: penetrating prepared steel strands in an internal framework, penetrating all the steel strands into a steel strand penetrating hole formed in the center of one fixed supporting plate and penetrating out of a steel strand penetrating hole formed in the center of the other fixed supporting plate, and respectively extending two ends of each steel strand out of the far end face of the fixed supporting plate;
D. anchoring the steel strand: firstly, sleeving anchor plates on two end heads extending out of the steel strands respectively, and enabling the end head of each steel strand to penetrate through a conical hole corresponding to each anchor plate; then, inserting clamping pieces with the same taper into each taper hole; secondly, prestress is loaded on the steel strand through a high-pressure loading device, so that the clamping piece and the anchor plate are subjected to self-locking, namely the anchorage devices at two ends are tensioned, and the steel strand is compact and not loose; then, the high-pressure loading device is removed, and the overlong steel strand is cut off (the length of the steel strand is ensured not to contact with an upper clamping plate in a subsequently arranged external connection assembly);
E. installing an external connection component: firstly, pre-penetrating each required connecting bolt into a bolt penetrating unthreaded hole corresponding to the upper clamping plate; then, each limit sleeve is penetrated and installed on the corresponding connecting bolt; then, the end head of each connecting bolt is preliminarily penetrated into each threaded hole at the edge of the fixed supporting plate; next, adjusting the limiting sleeve to enable two ends of the limiting sleeve to be respectively clamped and embedded in inner sunken grooves formed in end faces of opposite ends of the upper clamping plate and the fixed supporting plate for positioning (the influence of rotary shearing force during testing can be avoided); finally, fastening the connecting bolt to enable the threaded section of the connecting bolt to be tightly combined with the threaded hole of the fixed support plate, namely, the external connecting component is firmly connected to the internal framework;
F. connecting a fatigue testing machine: fixing a clamping handle in the fatigue testing device on a chuck of the fatigue testing machine;
G. carrying out fatigue test: inputting test parameters, starting a fatigue testing machine, starting fatigue testing, observing and recording test data, and analyzing an experiment result.
The high-pressure loading device is a jack (or any other known loading device).
The prestress loaded on the steel strand does not exceed 10% of the nominal ultimate tensile resistance of the steel strand.
The design principle of the invention is as follows:
the invention adopts a brand new loading method and an assembly method, and simulates the actual working state of the anchor connector under the dynamic load by monitoring the stress value in real time and collecting related data through strain gauges which are arranged at the detection position of the anchor connector according to requirements, so the test quality obtained by testing the fatigue performance of the anchor connector by using the invention is stable and the universality is high; the invention does not need to build a special test platform, so the test cost is low and the operation is simple. Therefore, the fatigue performance test of the anchor connector by using the method can provide real-time and accurate analysis data for exploring the association between the stress state and the failure, and provide reliable technical basis and technical service for judging the fatigue performance state of the anchor connector and testing and researching the fatigue life.
Furthermore, the pre-tensioning supporting rod supports the fixed supporting plate to conduct outward supporting force, the steel strand is loaded with prestress through the high-pressure loading device to achieve inward tension of the anchorage device, and the tension and the supporting force of the anchorage device are balanced to form anchorage device prestress. Set for test stress, amplitude, loading frequency, loading speed, cycle number test parameter such as back start fatigue test machine, on experimental stress transmitted the ground tackle through centre gripping handle, connecting bolt, stop collar, fixed stay, observe, record test data to analysis experiment result: i.e., whether the anchor is intact and deformed within a defined number of cycles to determine the fatigue performance state and fatigue life of the anchor connector.
The invention has the following beneficial technical effects:
the invention provides a device and a method suitable for testing fatigue performance of an anchorage connector. The testing device and the testing method have the advantages of high universality, stable testing quality, low testing cost and simple operation, provide real-time and accurate analysis data for exploring the correlation between the stress state and the failure, and provide reliable technical basis and technical service for judging the fatigue performance state of the anchor connector and testing and researching the fatigue life.
Drawings
FIG. 1 is a schematic view of the structure of the test apparatus of the present invention (i.e., a sectional view B-B in FIG. 2).
Fig. 2 is a sectional view taken along line a-a in fig. 1 (i.e., a sectional view of the fixed support plate).
FIG. 3 is a flow chart of a test method of the present invention.
Number in the figure: 1. the device comprises a clamping handle, 2 parts of a connecting bolt, 3 parts of an upper clamping plate, 4 parts of a limiting sleeve, 5 parts of a fixed supporting plate, 5 parts of 1 part of a steel strand penetrating hole, 5 parts of 2 parts of a unthreaded hole, 5 parts of a threaded hole, 6 parts of a clamping piece, 7 parts of an anchor plate, 8 parts of a steel strand, 9 parts of a pre-tensioning supporting rod, 10 parts of a positioning bolt, 11 parts of an inner sinking groove.
Detailed Description
The invention is further described below with reference to the figures and examples:
as shown in fig. 1 and 2, the device for testing fatigue performance of an anchor connector of the present invention comprises an i-shaped internal framework, anchors located at two outer end surfaces of the internal framework, external connection components for connecting the internal framework and a fatigue testing machine, and a strain gauge connected with an external monitoring system; the internal framework is an I-shaped structure formed by uniformly supporting and fixing a plurality of same pre-tensioned support rods 9 between two fixed support plates 5 with the same structure through positioning bolts 10; the anchor device is composed of an anchor plate 7 with a plurality of conical holes and a clamping piece 6 inserted and embedded in the conical holes of the anchor plate 7, the inner cavity of the clamping piece 6 is a cylindrical hole and has a frustum cone-shaped structure, and the frustum cone of the clamping piece 6 is the same as that of the conical holes of the anchor plate 7 (when the anchor device is under the action of external pulling force, the clamping piece 6 with the same cone and the anchor plate 7 are fastened through self-locking); the external connecting component comprises an upper clamping plate 3, a clamping handle 1 embedded in the center of the upper clamping plate 3, a limiting sleeve 4 supported between the upper clamping plate 3 and a fixed supporting plate 5, and a connecting bolt 2 which is arranged in an inner cavity of the limiting sleeve 4 in a penetrating mode and is used for connecting the upper clamping plate 3 and the fixed supporting plate 5 (the external connecting component is not only firmly connected with an internal framework through the connecting bolt 2 and the limiting sleeve 4, but also ensures that all steel strands in an anchorage device are stressed synchronously and uniformly, and meanwhile, the external connecting component is connected with a fatigue testing machine through the clamping handle 1).
In the invention, a steel strand penetrating hole 5-1 is formed in the center of a fixed support plate 5, the inner diameter of the steel strand penetrating hole 5-1 is smaller than the outer diameter of an anchor plate 7 (so that the anchor plate 7 can be pressed on the outer end surface of the fixed support plate 5, and a pre-tensioning support rod 9 supports the outward-conducted supporting force of the fixed support plate 5 and the inward tension of an anchorage device generated by a steel strand 8 loaded with the prestress reaches balance to form anchorage device prestress); threaded holes 5-3 matched with the connecting bolts 2 in number and specification are uniformly distributed in the penetrating holes 5-1 surrounding the steel strands; a plurality of unthreaded holes 5-2 which are used for installing positioning bolts 10 and are provided with relative sliding gaps are uniformly distributed on the fixed supporting plate 5 between the threaded holes 5-3 and the steel strand penetrating holes 5-1 and around the steel strand penetrating holes 5-1 (the unthreaded holes 5-2 can realize the free sliding of the relative small gap between the positioning bolts 10 and the fixed supporting plate 5 in the fatigue test process, and the pre-tensioning supporting rod 9 is prevented from reversely generating test resistance, so that the test tension is ensured to completely act on the anchorage device through the steel strand 8).
In the invention, threaded blind holes matched with the positioning bolts 10 are formed at two ends of the pre-tensioning support rod 9 (after the threaded blind holes are combined with the positioning bolts 10, the pre-tensioning support rod 9 and the fixed support plates 5 at two ends are connected into a whole to build an internal framework of the testing device).
In the invention, the upper clamping plate 3 is provided with a bolt through-mounting unthreaded hole matched with the connecting bolt 2.
In the invention, the end faces of the opposite ends of the upper clamping plate 3 and the fixed supporting plate 5 are respectively provided with an inner sunken groove 11 for positioning the limiting sleeve 4 (the limiting sleeve 4 is positioned in the inner sunken groove 11, so that the influence of the rotating shearing force during the test can be avoided).
In the invention, the number of the positioning bolts 10 and the number of the connecting bolts 2 are four (synchronous stress and uniform stress are ensured).
The method of fatigue performance testing of an anchor connector using the apparatus of the present invention was as follows (see FIG. 3):
example one
The method of the embodiment comprises the following steps:
A. preparing the steel strands, namely preparing seven steel strands 8 which are in a group, have free lengths of more than 800mm and specification models of 1 × 7-15.20-1860, and cutting the required steel strands.
B. Building an internal framework: one ends of four pre-tensioned support rods 9 with the length of 1m are connected with one fixed support plate 5 through four positioning bolts 10, and the other ends of the four pre-tensioned support rods 9 are connected with the other fixed support plate 5 through the other four positioning bolts 10 to build an I-shaped internal framework; the threaded section of the positioning bolt 10 is screwed into the threaded blind hole corresponding to the end of the pretension supporting rod 9, and the positioning bolt 10 can freely slide in the unthreaded hole 5-2 with a small gap relative to the fixed supporting plate 5.
C. Threading and installing steel strands: and (3) penetrating prepared steel strands in the internal framework, allowing all the steel strands to penetrate through a steel strand penetrating hole 5-1 formed in the center of one fixed supporting plate 5 and penetrate out of a steel strand penetrating hole 5-1 formed in the center of the other fixed supporting plate 5, and allowing two ends of each steel strand to respectively extend out of the far end face of the fixed supporting plate 5.
D. Anchoring the steel strand: firstly, sleeving anchor plates 7 on two end heads extending out of the steel strands respectively, so that the end head of each steel strand penetrates through a corresponding taper hole of each anchor plate 7; then, inserting and embedding the clamping pieces 6 with the same taper into each taper hole; secondly, prestress is loaded on the steel strands through a jack, so that the clamping pieces 6 and the anchor plates 7 are subjected to self-locking, namely the anchors at two ends are tensioned, and the steel strands are compact and not loose; and then, the jack is removed, and the overlong steel strand is cut off.
E. Installing an external connection component: firstly, pre-threading each required connecting bolt 2 into a bolt threading unthreaded hole corresponding to the upper clamping plate 3; then, each limit sleeve 4 is penetrated and installed on the corresponding connecting bolt 2; then, the end heads of the connecting bolts 2 are preliminarily penetrated into the threaded holes 5-3 on the edge of the fixed support plate 5; next, adjusting the limiting sleeve 4 to enable two ends of the limiting sleeve 4 to be respectively clamped and embedded in inner sunken grooves 11 formed in end faces of opposite ends of the upper clamping plate 3 and the fixed supporting plate 5 for positioning; finally, the connecting bolt 2 is fastened, so that the thread section of the connecting bolt 2 is tightly combined with the threaded hole 5-3 of the fixed supporting plate 5, namely, the external connecting component is firmly connected to the internal framework.
F. Connecting a fatigue testing machine: the grip handle 1 in the fatigue testing apparatus is fixed to the collet of the fatigue testing machine.
G. Carrying out fatigue test: inputting test parameters as an upper limit value of test stress of 0.7Fptk（Fptk8 nominal ultimate tensile strength of steel strand), amplitude 0.2FptkThe loading frequency is 5Hz, the loading speed is 50MPa/min, the cycle number is required to be 200 ten thousand, a fatigue testing machine is started, a fatigue test is started, test data are observed and recorded, and the analysis experiment result shows that the anchor device with the cycle number of 200 ten thousand is intact, undamaged, not deformed and not broken in the steel strand 8.
Example two
The method of the embodiment comprises the following steps:
A. preparing steel strands, namely preparing six steel strands 8 which are in a group, have free lengths of more than 800mm and specification models of 1 × 7-15.20-1860, and cutting the required steel strands.
B. Building an internal framework: one ends of four pre-tensioned support rods 9 with the length of 1m are connected with one fixed support plate 5 through four positioning bolts 10, and the other ends of the four pre-tensioned support rods 9 are connected with the other fixed support plate 5 through the other four positioning bolts 10 to build an I-shaped internal framework; the threaded section of the positioning bolt 10 is screwed into the threaded blind hole corresponding to the end of the pretension supporting rod 9, and the positioning bolt 10 can freely slide in the unthreaded hole 5-2 with a small gap relative to the fixed supporting plate 5.
C. Threading and installing steel strands: and (3) penetrating prepared steel strands in the internal framework, allowing all the steel strands to penetrate through a steel strand penetrating hole 5-1 formed in the center of one fixed supporting plate 5 and penetrate out of a steel strand penetrating hole 5-1 formed in the center of the other fixed supporting plate 5, and allowing two ends of each steel strand to respectively extend out of the far end face of the fixed supporting plate 5.
D. Anchoring the steel strand: firstly, sleeving anchor plates 7 on two end heads extending out of the steel strands respectively, so that the end head of each steel strand penetrates through a corresponding taper hole of each anchor plate 7; then, inserting and embedding the clamping pieces 6 with the same taper into each taper hole; secondly, prestress is loaded on the steel strands through a jack, so that the clamping pieces 6 and the anchor plates 7 are subjected to self-locking, namely the anchors at two ends are tensioned, and the steel strands are compact and not loose; and then, the jack is removed, and the overlong steel strand is cut off.
E. Installing an external connection component: firstly, pre-threading each required connecting bolt 2 into a bolt threading unthreaded hole corresponding to the upper clamping plate 3; then, each limit sleeve 4 is penetrated and installed on the corresponding connecting bolt 2; then, the end heads of the connecting bolts 2 are preliminarily penetrated into the threaded holes 5-3 on the edge of the fixed support plate 5; next, adjusting the limiting sleeve 4 to enable two ends of the limiting sleeve 4 to be respectively clamped and embedded in inner sunken grooves 11 formed in end faces of opposite ends of the upper clamping plate 3 and the fixed supporting plate 5 for positioning; finally, the connecting bolt 2 is fastened, so that the thread section of the connecting bolt 2 is tightly combined with the threaded hole 5-3 of the fixed supporting plate 5, namely, the external connecting component is firmly connected to the internal framework.
F. Connecting a fatigue testing machine: the grip handle 1 in the fatigue testing apparatus is fixed to the collet of the fatigue testing machine.
G. Carrying out fatigue test: inputting test parameters as an upper limit value of test stress of 0.7Fptk（F ptk8 nominal ultimate tensile strength of the steel strand), amplitude of 0.3FptkAnd the loading frequency is 20Hz, the loading speed is 40MPa/min, the cycle number is required to be 200 ten thousand, a fatigue testing machine is started, a fatigue test is started, test data are observed and recorded, and the experimental result is analyzed, namely that the anchorage device with the cycle number of 200 ten thousand is intact, undamaged and not deformed, and the steel strand 8 is broken by two pieces at a clamping position of 328 mm.
EXAMPLE III
The method of the embodiment comprises the following steps:
A. preparing steel strands, namely preparing four steel strands 8 which are in a group, have free lengths of more than 800mm and specification models of 1 × 7-15.20-1860, and cutting the required steel strands.
B. Building an internal framework: one ends of four pre-tensioned support rods 9 with the length of 1m are connected with one fixed support plate 5 through four positioning bolts 10, and the other ends of the four pre-tensioned support rods 9 are connected with the other fixed support plate 5 through the other four positioning bolts 10 to build an I-shaped internal framework; the threaded section of the positioning bolt 10 is screwed into the threaded blind hole corresponding to the end of the pretension supporting rod 9, and the positioning bolt 10 can freely slide in the unthreaded hole 5-2 with a small gap relative to the fixed supporting plate 5.
C. Threading and installing steel strands: and (3) penetrating prepared steel strands in the internal framework, allowing all the steel strands to penetrate through a steel strand penetrating hole 5-1 formed in the center of one fixed supporting plate 5 and penetrate out of a steel strand penetrating hole 5-1 formed in the center of the other fixed supporting plate 5, and allowing two ends of each steel strand to respectively extend out of the far end face of the fixed supporting plate 5.
D. Anchoring the steel strand: firstly, sleeving anchor plates 7 on two end heads extending out of the steel strands respectively, so that the end head of each steel strand penetrates through a corresponding taper hole of each anchor plate 7; then, inserting and embedding the clamping pieces 6 with the same taper into each taper hole; secondly, prestress is loaded on the steel strands through a jack, so that the clamping pieces 6 and the anchor plates 7 are subjected to self-locking, namely the anchors at two ends are tensioned, and the steel strands are compact and not loose; and then, the jack is removed, and the overlong steel strand is cut off.
E. Installing an external connection component: firstly, pre-threading each required connecting bolt 2 into a bolt threading unthreaded hole corresponding to the upper clamping plate 3; then, each limit sleeve 4 is penetrated and installed on the corresponding connecting bolt 2; then, the end heads of the connecting bolts 2 are preliminarily penetrated into the threaded holes 5-3 on the edge of the fixed support plate 5; next, adjusting the limiting sleeve 4 to enable two ends of the limiting sleeve 4 to be respectively clamped and embedded in inner sunken grooves 11 formed in end faces of opposite ends of the upper clamping plate 3 and the fixed supporting plate 5 for positioning; finally, the connecting bolt 2 is fastened, so that the thread section of the connecting bolt 2 is tightly combined with the threaded hole 5-3 of the fixed supporting plate 5, namely, the external connecting component is firmly connected to the internal framework.
F. Connecting a fatigue testing machine: the grip handle 1 in the fatigue testing apparatus is fixed to the collet of the fatigue testing machine.
G. Carrying out fatigue test: inputting test parameters as an upper limit value of test stress of 0.7Fptk（F ptk8 nominal ultimate tensile strength of the steel strand), amplitude of 0.2FptkLoading frequency of 60Hz, loading speedThe degree is 30MPa/min, the cycle number is required to be 200 ten thousand, a fatigue testing machine is started, a fatigue test is started, test data are observed and recorded, and the analysis experiment result shows that the anchorage device with the cycle number of 200 ten thousand is intact, does not generate deformation and does not generate fracture of the steel strand 8.
Claims (8)
1. A method suitable for testing fatigue performance of an anchorage connector is characterized by comprising the following steps: the method comprises the following steps:
A. preparing a steel strand: determining the length of the steel strand (8) according to the lengths of the testing device and the high-voltage loading device, determining the number of the steel strands according to the performance parameters of the fatigue testing machine, and cutting the required steel strand;
B. building an internal framework: one ends of four pre-tensioning support rods (9) are connected with one fixed support plate (5) through four positioning bolts (10), and the other ends of the four pre-tensioning support rods (9) are connected with the other fixed support plate (5) through the other four positioning bolts (10) to build an I-shaped internal framework; wherein, the thread section of the positioning bolt (10) is screwed into the corresponding thread blind hole at the end of the pretension supporting rod (9);
C. threading and installing steel strands: the prepared steel strands are arranged in the internal framework in a penetrating mode, all the steel strands penetrate through a steel strand penetrating hole (5-1) formed in the center of one fixed supporting plate (5) and penetrate out of a steel strand penetrating hole (5-1) formed in the center of the other fixed supporting plate (5), and two ends of each steel strand extend out of the end face of the far end of the fixed supporting plate (5) respectively;
D. anchoring the steel strand: firstly, sleeving anchor plates (7) on two end heads extending out of the steel strands respectively, and enabling the end head of each steel strand to penetrate through a corresponding taper hole of each anchor plate (7); then, inserting and embedding a clamping piece (6) with the same taper into each taper hole; secondly, prestress is loaded on the steel strand through a high-pressure loading device, so that the clamping piece (6) and the anchor plate (7) are subjected to self-locking, namely the anchors at two ends are tensioned, and the steel strand is compact and not loose; then, the high-voltage loading device is removed, and the overlong steel strand is cut off;
E. installing an external connection component: firstly, pre-penetrating each required connecting bolt (2) into a bolt penetrating unthreaded hole corresponding to an upper clamping plate (3) with a clamping handle (1) embedded in the center; then, each limit sleeve (4) is penetrated and installed on the corresponding connecting bolt (2); then, the end of each connecting bolt (2) is preliminarily penetrated into each threaded hole (5-3) on the edge of the fixed supporting plate (5); next, adjusting the limiting sleeve (4) to enable two ends of the limiting sleeve (4) to be respectively clamped and embedded in inner sunken grooves (11) formed in end faces of opposite ends of the upper clamping plate (3) and the fixed supporting plate (5) for positioning; finally, fastening the connecting bolt (2) to enable the threaded section of the connecting bolt (2) to be tightly combined with the threaded hole (5-3) of the fixed support plate (5), namely, the external connecting component is firmly connected to the internal framework;
F. connecting a fatigue testing machine: fixing a clamping handle (1) in the fatigue testing device on a chuck of the fatigue testing machine;
G. carrying out fatigue test: inputting test parameters, starting a fatigue testing machine, starting fatigue testing, observing and recording test data, and analyzing an experiment result.
2. The method of claim 1, wherein the testing is performed using a fatigue test of the anchor connector, wherein the testing comprises: the high-pressure loading device is a jack.
3. The method of claim 1, wherein the testing is performed using a fatigue test of the anchor connector, wherein the testing comprises: the prestress loaded to the steel strand does not exceed 10% of the nominal ultimate tensile strength of the steel strand (8).
4. An apparatus adapted for fatigue performance testing of an anchor connector using the method of claim 1, wherein: the fatigue testing device comprises a I-shaped internal framework, anchors positioned on two outer end faces of the internal framework, an external connecting component used for connecting the internal framework and a fatigue testing machine, and a strain gauge connected with an external monitoring system, wherein the internal framework is an I-shaped structure formed by uniformly supporting and fixing a plurality of same pre-tensioning supporting rods (9) between two fixed supporting plates (5) with the same structure through positioning bolts (10); the anchor device is composed of an anchor plate (7) with a plurality of taper holes arranged therein and a clamping piece (6) inserted and embedded in the taper holes of the anchor plate (7), the inner cavity of the clamping piece (6) is a cylindrical hole and has a frustum cone-shaped structure, and the frustum cone of the clamping piece (6) is the same as that of the taper holes of the anchor plate (7); the external connection component comprises an upper clamping plate (3), a clamping handle (1), a limiting sleeve (4) supported between the upper clamping plate (3) and the fixed supporting plate (5), and a connecting bolt (2) which is arranged in an inner cavity of the limiting sleeve (4) in a penetrating manner and is used for connecting the upper clamping plate (3) and the fixed supporting plate (5); a steel strand penetrating hole (5-1) is formed in the center of the fixed supporting plate (5), and the inner diameter of the steel strand penetrating hole (5-1) is smaller than the outer diameter of the anchor plate (7); threaded holes (5-3) which are matched with the connecting bolts (2) in number and specification are uniformly distributed in the penetrating holes (5-1) around the steel strands; a plurality of unthreaded holes (5-2) which are used for installing positioning bolts (10) and are provided with relative sliding gaps are uniformly distributed on the fixed supporting plate (5) between the threaded hole (5-3) and the steel strand penetrating hole (5-1) and around the steel strand penetrating hole (5-1); the positioning bolt (10) slides freely with a small gap in the unthreaded hole (5-2) relative to the fixed support plate (5).
5. The device of claim 4, wherein the anchor connector is adapted to perform a fatigue performance test on the anchor connector by: and threaded blind holes matched with the positioning bolts (10) are formed in both ends of the pre-tensioning supporting rod (9).
6. The device of claim 4, wherein the anchor connector is adapted to perform a fatigue performance test on the anchor connector by: and the upper clamping plate (3) is provided with a bolt through unthreaded hole matched with the connecting bolt (2).
7. The device of claim 4, wherein the anchor connector is adapted to perform a fatigue performance test on the anchor connector by: and inner sunken grooves (11) for positioning the limiting sleeves (4) are formed in the end surfaces of the opposite ends of the upper clamping plate (3) and the fixed supporting plate (5).
8. The device of claim 4, wherein the anchor connector is adapted to perform a fatigue performance test on the anchor connector by: the number of the positioning bolts (10) and the number of the connecting bolts (2) are four.
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| CN109238675B (en) * | 2018-07-10 | 2019-12-27 | 同济大学 | Anchor clamp fatigue test device |
| CN114441295B (en) * | 2022-02-18 | 2024-07-19 | 浙江省交通运输科学研究院 | Test piece load holding device for anchor periodic load and fatigue test and use method |
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