Test fixture for simply supported beam fatigue loading and use method of test fixture

Abstract

The invention discloses a test fixture for simply supported beam fatigue loading and a use method of the text fixture, and belongs to the technical field of test fixtures. The test fixture comprises a fixture I arranged on the midspan of a simply supported beam, a fixture II and a vibrating motor, the fixture II and the vibrating motor are arranged at the two ends of the simply supported beam respectively, the fixture I comprises a fastening plate I, a fastening plate II, screws, nuts, clamping plates and load ribs which are arranged on the upper side and the lower side of the simply supported beam, the fastening plate I is connected with the fastening plate II through the screws and the nuts, the clamping plates are arranged on the portions, on the two sides of the simply supported beam, of the opposite surfaces of the first fastening plate I and the fastening plate II, it is guaranteed that the simply supported beam does not move or topple over in the fatigue loading process, two load ribs are arranged between the fastening plate I and the simply supported beam and between the fastening plate II and the simply supported beam separately, a three dividing point loading form is formed, the portion, between every two load ribs, of the simply supported beam forms a pure bending section, and the vibrating motor is arranged on the upper portion of the fastening plate II at the upper end of the simply supported beam. By means of the load ribs, the dead weight and fatigue load of the fixtures and the vibrating motor are transmitted to the simply supported beam, and a test specimen cannot jitter under the action of a dynamic load.

Description

technical field [0001] The invention belongs to the technical field of test fixtures, in particular to a test fixture for simply supported beam fatigue loading and a using method thereof. Background technique [0002] In actual engineering, reinforced concrete has become the most common building material, and reinforced concrete materials can ensure that the structure has good working performance within the design service life. With the development of national construction, the load situation of the structure is becoming more and more complex. Simply considering the static load of the structure can no longer meet the needs of design and actual engineering. Due to the effect of fatigue load, the structure will be damaged when it is less than the design service life. There are more and more cases, causing huge safety hazards and economic losses. Therefore, considering the performance of structures under cyclic loads has become the focus of engineers. Structures such as bridg...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above-mentioned technical problems of conventional fatigue tests such as long test time and high cost, the present invention provides a test fixture for fatigue loading of simply supported beams and a method for using the same. Vibration motors are used as the fatigue loading equipment. While providing the fatigue load requirements, it can ensure that the initial position of the simply supported beam remains unchanged, effectively position and clamp the simply supported beam, ensure the progress of the fatigue test, and facilitate the observation of the damage of the test piece

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