Cable Anchorage and Cable Force Testing Device for Low-tower Cable-Stayed Bridge Used in Large-scale Model Test

Abstract

The invention belongs to the technical field of vibration tests and impact tests of structural components, and discloses an extradosed cable-stayed bridge inhaul cable anchoring and cable force testing device for a large-sized model test. The device comprises a cable adjusting screw rod; the right side of an adjusting joint penetrates through a cable guiding tube, a stay cable penetrates through the interior of the cable guiding tube and winds a main bobbin, a wire clamping device is clamped at the lower side in the adjusting joint, the lower end of the cable adjusting screw rod is welded to the upper end of the main bobbin, the cable adjusting screw rod is fixed to the upper end of the adjusting joint through a nut, a fixing washer is laid between the nut and the adjusting joint, and theupper end of the cable adjusting screw rod is in screw joint with an adjusting handle; the left side of the adjusting joint penetrates through a main beam anchoring screw rod, the main beam anchoringscrew rod is sleeved with an S-shaped steel rebar meter and main beam anchoring screw caps, and a non-slip gasket is laid between the main beam anchoring screw caps. By means of the device, the stressof the stay cable in a large-sized extradosed cable-stayed bridge model is close to a real stress condition, the cable force can be conveniently and quickly adjusted and tested, and the device is simple, feasible and higher in precision.

Description

technical field [0001] The invention belongs to the technical fields of vibration testing of structural components and impact testing of structural components, and in particular relates to a cable anchoring and cable force testing device for a short-tower cable-stayed bridge used in large-scale model tests. Background technique [0002] At present, the existing technology commonly used in the industry is as follows: the low-tower cable-stayed bridge belongs to the multi-time hyperstatically indeterminate system, and its mechanical performance is between the continuous rigid frame bridge and the cable-stayed bridge. In order to analyze its mechanical performance At present, the method of model test is mostly used for indoor research. The geometric size of the structural model test is smaller than that of the prototype, which is easy to manufacture, easy to assemble and disassemble, and the same model can carry out multiple simulation tests under different working conditions. ...

AI Technical Summary

Problems solved by technology

[0004] (1) In the prior art, S-shaped steel bar meter is installed in the middle of the cable. Because the cable is too thin, it is difficult to fix the sensor when connecting, and the quality of the sensor is larger than the cable of the test model. After the cables are connected in series, the stay cables are prone to slipping and loosening, the anchoring system fails, and the quality and stiffness of the entire cable change, resulting in large errors in the experimental data

[0005] (2) In the existing model test, it is easy to cause inconvenient cable adjustment, high cost and low precision compared with the test cable force caused by the loose cable

A single steel strand that is too thin cannot be directly connected to the sensor for cable force testing in a naturally straightened state, and because both ends of the cable-stayed cable need to be anchored to the pylon and girder bottom of the cable-stayed bridge, it cannot pass Directly tighten the steel strands to adjust the cable force, so the experimenter needs to design a cable anchoring system that can fix the cable and connect with the cable force test device

[0008] A single steel strand is small in diameter, light in weight, and smooth in surface. When connecting to the anchorage system, it is necessary to consider that the mass of the anchorage device and the cable force test device is much larger than that of the steel strand, which will cause the steel strand to be pulled by gravity and cause the cable force to continue to increase. Affected by the anchoring device and testing device, the experimental data cannot truly reflect the force characteristics of the cable-stayed bridge model itself, with an error of more than 30%.

When the stay cable and the anchoring device are in contact with each other and there is serious relative slippage, there have been cases where the error has reached more than 3 times the actual test result

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