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CN-121977776-A - Stay rope resonance fatigue test device and method

CN121977776ACN 121977776 ACN121977776 ACN 121977776ACN-121977776-A

Abstract

The invention discloses a stay cable resonance fatigue test device and a stay cable resonance fatigue test method, which relate to the technical field of stay cable fatigue performance detection, wherein the device comprises: the device comprises a first counter-force seat, a second counter-force seat, a tool rope, an actuator and an inertial container, wherein the first counter-force seat and the second counter-force seat are oppositely arranged at intervals, a slidable connecting piece is arranged between the first counter-force seat and the second counter-force seat, one end of a test rope is anchored on the first counter-force seat, the other end of the test rope is anchored on the connecting piece, one end of the tool rope is anchored on the connecting piece, the other end of the tool rope penetrates through the second counter-force seat and is connected with a pretension component for applying pretension to the tool rope, the tool rope and the test rope form opposite tensioning, the actuator drives the connecting piece to slide back and forth between the first counter-force seat and the second counter-force seat, one end of the inertial container is connected with the connecting piece, and inertial force generated by the inertial container and elastic force generated by repeated tensioning of the test rope and the tool rope are offset. The invention reduces the whole cost of the equipment and the requirement of the equipment on the installation space.

Inventors

  • CHAI XIAOPENG
  • YANG LING
  • HUANG QIWEN
  • ZHANG LIANG
  • DONG JINGLI
  • PENG SIJIE
  • WANG ZHENGXING
  • ZHONG JIWEI
  • PENG XUMIN
  • JIA XIAOLONG
  • LI YAMIN
  • DAI QINGNIAN
  • DONG FEI

Assignees

  • 中铁大桥局集团有限公司
  • 中铁大桥科学研究院有限公司
  • 中铁桥研科技有限公司

Dates

Publication Date
20260505
Application Date
20260407

Claims (10)

  1. 1. A cable resonance fatigue test device for carry out resonance fatigue test to test cable, its characterized in that, cable resonance fatigue test device includes: The device comprises a first counterforce seat (1) and a second counterforce seat (2) which are oppositely arranged at intervals, wherein a slidable connecting piece (3) is arranged between the first counterforce seat (1) and the second counterforce seat (2), one end of a test rope (4) is anchored to the first counterforce seat (1), and the other end of the test rope (4) is anchored to the connecting piece (3); a tool cable (5), one end of the tool cable (5) is anchored to the connecting piece (3), the other end of the tool cable (5) passes through the second counter-force seat (2) and is connected with a pretension component (6) for applying pretension to the tool cable (5), and the tool cable (5) and the test cable (4) are coaxially arranged to form opposite tensioning; An actuator (7), wherein the actuator (7) is arranged between the second counterforce seat (2) and the connecting piece (3) to drive the connecting piece (3) to slide back and forth between the first counterforce seat (1) and the second counterforce seat (2); The inertial measurement device comprises an inertial measurement unit (8), wherein one end of the inertial measurement unit (8) is connected with the connecting piece (3), the other end of the inertial measurement unit (8) is fixed on a third reaction seat (11), and the inertial force generated by the inertial measurement unit (8) is offset with the elastic force generated by repeatedly stretching the test cable (4) and the tool cable (5).
  2. 2. A stay resonance fatigue test device according to claim 1, wherein the connecting piece (3) comprises: the linear guide rail (31) and the connecting seat (32) are connected to the linear guide rail (31) in a sliding manner, and the guide of the linear guide rail (31) is arranged along the axial direction of the test cable (4) so that the connecting seat (32) slides back and forth along the direction towards the first counter-force seat (1) or the second counter-force seat (2).
  3. 3. The stay cable resonance fatigue test device according to claim 2, wherein the connecting seat (32) is a hollow box body, the box body at least comprises a first side plate and a second side plate which are oppositely arranged, the first side plate is provided with a first anchoring hole for anchoring the test cable (4), and the second side plate is provided with a second anchoring hole for anchoring the tool cable (5).
  4. 4. A stay resonance fatigue testing device according to claim 3, wherein one end of the test cable (4) is anchored to the first reaction seat (1) by a stay anchor (12), the other end of the test cable (4) passes through the first anchoring hole and is anchored to the connection seat (32) by the stay anchor (12), and one end of the tool cable (5) passes through the second anchoring hole and is anchored to the connection seat (32) by the stay anchor (12).
  5. 5. A guy cable resonance fatigue test apparatus according to claim 3, wherein four corners of the bottom surface of the case are respectively fixed with a slider (33), the number of the linear guides (31) is two, the two linear guides (31) are arranged in parallel, and the two sliders (33) arranged along the length direction of the bottom surface of the case and the same linear guide (31) form a sliding pair.
  6. 6. A guy cable resonance fatigue test apparatus according to claim 1, wherein the inertial container (8) is connected to the connecting piece (3) by a lever assembly (9), the input end of the lever assembly (9) is hinged to the connecting piece (3), the output end of the lever assembly (9) is hinged to the inertial container (8), and the fulcrum of the lever assembly (9) is hinged to a support hinge (10) between the inertial container (8) and the connecting piece (3).
  7. 7. The stay resonance fatigue test device according to claim 6, wherein the lever assembly (9) comprises a lever (91) and a supporting rod (92), the supporting rod (92) is connected to the connecting piece (3) and the supporting rod (92) extends along the sliding direction of the connecting piece (3), one end of the lever (91) is connected with the extending end of the supporting rod (92) away from the connecting piece (3), the other end of the lever (91) is connected with the inertial container (8), and the lever (91) and the supporting rod (92) are mutually perpendicular.
  8. 8. A stay resonance fatigue testing device according to claim 1, wherein the pre-tightening assembly (6) comprises: The device comprises a counter-force cross beam (61) arranged at one end of a connecting piece (3) away from a second counter-force seat (2), a jacking piece (62) is arranged between the counter-force cross beam (61) and the second counter-force seat (2), a tensioning fixing nut (63) is arranged on the counter-force cross beam (61), and a tensioning connecting plate (64) used for being anchored with one end of a tool rope (5) penetrating through the second counter-force seat (2) is arranged at the screwing end of the tensioning fixing nut (63).
  9. 9. A stay resonance fatigue testing device according to claim 1, wherein actuators (7) are arranged on both sides of the tool cable (5).
  10. 10. A cable resonance fatigue test method for performing a resonance fatigue test on a test cable based on the cable resonance fatigue test apparatus according to any one of claims 1 to 9, characterized by comprising: two ends of a test rope (4) are respectively anchored to the first counter-force seat (1) and the connecting piece (3), and two ends of a tool rope (5) are respectively anchored to the connecting piece (3) and the second counter-force seat (2), so that the test rope (4) and the tool rope (5) are tensioned in opposite directions; Applying pretension to the tool rope (5) through the pretension assembly (6) to enable the test rope (4) to reach a preset initial stress level and maintain the tensioning state of the tool rope (5); Adjusting the inertial mass of the inertial container (8) to enable the natural frequencies of the connecting piece (3), the test cable (4), the tool cable (5) and the inertial container (8) to approach the preset excitation frequency of the actuator (7); And starting an actuator (7) at a preset excitation frequency to drive the connecting piece (3) to slide reciprocally, wherein the test cable (4) and the tool cable (5) resonate, and the actuator (7) continuously applies alternating load to the test cable (4) and the tool cable (5) until the fatigue test of the test cable (4) is completed.

Description

Stay rope resonance fatigue test device and method Technical Field The invention relates to the technical field of inhaul cable fatigue performance detection, in particular to an inhaul cable resonance fatigue test device and method. Background The inhaul cable is a cable bearing the tension and is a key bearing component of a large-scale engineering structure. In the operation process, the inhaul cable can bear alternating load caused by external excitation besides bearing high stress brought by the structure. Therefore, the fatigue performance of the inhaul cable is one of the key performance indexes, and the fatigue performance detection is required before the actual application. In order to simulate the actual working state of the inhaul cable, in a fatigue test, the inhaul cable is generally pulled to a certain stress level, and on the basis, alternating load is applied to achieve the set stress amplitude. At present, the existing inhaul cable fatigue testing machine generally adopts a straight pull mode, an actuator needs to apply inhaul cable initial tension and fatigue load, and the loading tonnage and oil source requirements of the actuator are huge. In order to reduce the loading tonnage of the actuator, the common practice is to utilize the tool rope and the test rope to oppositely pull and bear the initial tension of the test rope, and the actuator only needs to apply fatigue load, so that the loading tonnage requirement of the actuator can be greatly reduced. Nevertheless, the elastic force increment generated by the cable reaching the set stress amplitude is quite large, the requirements of the actuator and the oil source are still quite large, and the overall manufacturing cost and the installation space of the equipment are high. Disclosure of Invention The application provides a stay cable resonance fatigue test device and method, which can solve the technical problems of huge loading tonnage and oil source requirement on an actuator in a stay cable resonance fatigue test in the prior art. In a first aspect, an embodiment of the present application provides a cable resonance fatigue test apparatus for performing a resonance fatigue test on a test cable, the cable resonance fatigue test apparatus including: the device comprises a first counterforce seat and a second counterforce seat which are oppositely arranged at intervals, wherein a slidable connecting piece is arranged between the first counterforce seat and the second counterforce seat, one end of a test cable is anchored to the first counterforce seat, and the other end of the test cable is anchored to the connecting piece; The tool rope is anchored at one end of the connecting piece, the other end of the tool rope passes through the second counter-force seat and is connected with the pretension component for applying pretension to the tool rope, and the tool rope and the test rope are coaxially arranged to form opposite tensioning; The actuator is arranged between the second counterforce seat and the connecting piece to drive the connecting piece to slide back and forth between the first counterforce seat and the second counterforce seat; And one end of the inertial container is connected with the connecting piece, the other end of the inertial container is fixed on the third reaction seat, and the inertial force generated by the inertial container is counteracted with the elastic force generated by repeatedly stretching the test cable and the tool cable. With reference to the first aspect, in one embodiment, the connector includes: the linear guide rail and the connecting seat are connected with the linear guide rail in a sliding manner, and the guide of the linear guide rail is arranged along the axial direction of the test cable, so that the connecting seat slides back and forth along the direction facing the first counterforce seat or the direction facing the second counterforce seat. In combination with the first aspect, in an implementation manner, the connecting seat is a hollow box body, the box body at least comprises a first side plate and a second side plate which are oppositely arranged, a first anchoring hole for anchoring the test cable is formed in the first side plate, and a second anchoring hole for anchoring the tool cable is formed in the second side plate. With reference to the first aspect, in one embodiment, one end of the test cable is anchored to the first reaction seat by a cable anchor, the other end of the test cable passes through the first anchoring hole and is anchored to the connection seat by a cable anchor, and one end of the tool cable passes through the second anchoring hole and is anchored to the connection seat by a cable anchor. In combination with the first aspect, in one implementation manner, four corners of the bottom surface of the box body are respectively fixed with one sliding block, two linear guide rails are arranged in parallel, and two sliding blocks arranged along the length directio