Beam length variable simply supported beam and continuous beam self-vibration characteristic test platform

Abstract

The invention discloses a beam length variable simply supported beam and continuous beam self-vibration characteristic test platform, which comprises a sliding support, a limiting support, a movable base, a fixed base, a foundation platform, an acceleration sensor, a computer, a dynamic signal testing and analyzing system and a force hammer sensor, and is characterized in that the movable base and the sliding support can be adjusted and fixed according to the span of a test beam, a rolling bearing can be moved along a sliding rail, and fine adjustment is carried out on the distance between the sliding support and the limiting support; after the distance between the sliding support and the limiting support is determined, and limiting boards are placed at a gap between the bearing and the sliding rail so as to limit and fix the bearing. The test beam is placed on the sliding support and the limiting support; the sliding support and the limiting support are respectively fixed with support ends of the test beam through hook bolts and a double-hole clamping plate; the acceleration sensor is arranged on a test point at the surface of the test beam, and the acceleration sensor and the force hammer sensor are connected to the dynamic signal testing and analyzing system and are electrically connected with the computer; and a dynamic load is applied through the force hammer sensor, and thus a self-vibration characteristic test can be performed. Through movement of the movable base or increasing the number of the movable base, a test for self-vibration characteristics of simply supported beams or continuous beams with different beam lengths and spans can be realized, and the universality and the accuracy of the test platform are reflected.

Description

technical field [0001] The invention belongs to the technical field of road and bridge engineering, and relates to a test platform for natural vibration characteristics, in particular to a test platform for the natural vibration characteristics of simply supported beams with variable beam length and continuous beams; it is especially suitable for simply supported beams and continuous beams. Background technique [0002] The natural vibration characteristics of bridge structures are an important basis for evaluating the existing state of bridges. The test results of natural vibration characteristics of bridges in service period can be used for the calculation of bridge impact coefficient and damage identification. The test results of the natural vibration characteristics have the advantages of strong objectivity, the hidden parts of the structure can be found, the test time is short and the operation is convenient. Therefore, the natural vibration characteristics of bridge st...

AI Technical Summary

Problems solved by technology

[0004] The invention discloses a test platform for the natural vibration characteristics of simply supported beams with variable beam lengths and continuous beams, in order to solve the problem that the support conditions in the prior art are not accurate enough to affect the test results of the natural vibration characteristics; there is no universal test platform, and the test beam type and beam length change At the same time, the test materials are difficult to reuse, causing a lot of waste, and the test funds and test cycle are greatly increased.

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