Cable-stayed bridge anchorage and cable force testing device and method for large-scale model tests

Abstract

The invention belongs to the technical field of vibration testing of structural components, and impact testing for the structural components, and discloses a cable anchorage and cable force testing device and method using cable-stayed bridge to pull for large-scale model tests, including: an adjusting cable screw. The right side of an adjusting joint runs through a cable guide pipe. The inside ofthe cable guide pipe runs through with the cable-stayed. The cable-stayed is wound around a reel for thread. The lower side inside the adjusting joint is provided with a clamping device in clamp. Thelower side of the adjusting cable screw is welded on the reel for the thread. The adjusting cable screw is fixed above the adjusting joint by a nut. A gasket is arranged between the nut and the adjusting joint. The upper end of the adjusting cable screw is connected with a hand rocker in screw. The left side of the adjusting joint runs through a main girder anchoring screw. The main girder anchoring screw is connected with a tension sensor and main girder anchoring nuts in sleeve. Anti-skid washers are arranged between the main girder anchoring nuts. The cable anchorage and cable force testingdevice and method using the cable-stayed bridge to pull for the large-scale model tests makes the force of the cable-stayed bridge in the large-scale model close to an actual force condition, can achieve the adjustment of cable force and the test of the cable force conveniently and quickly, is simple and easy to operate, and has higher 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-stayed bridge anchorage and cable force testing device and method for large-scale model tests. Background technique [0002] At present, the existing technology commonly used in the industry is as follows: a cable-stayed bridge is a high-order statically indeterminate flexible system composed of a tower under pressure, a cable under tension and a beam under bending. This structure can be regarded as It is a multi-span elastically supported continuous beam with cables instead of buttresses, which has the advantages of reducing the bending moment in the beam body, reducing the height of the building, reducing the weight of the structure and saving materials. Cable-stayed bridges are mostly used to build bridges with a span of 500-800m. The scale of the physical project is huge. In or...

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Problems solved by technology

[0004] (1) In the prior art, the tension sensor 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 relatively large compared with the cable of the test model, which is different from that of the cable. After being connected in series, the stay cables are prone to slipping and loosening, the anchoring system fails, and the quality and stiffness of the entire stay cables change, resulting in large errors in 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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