JP2000338021A - Movement vibration fatigue-testing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out various configuration tests while an actual load is being applied by reciprocating a sample in a horizontal direction by a truck and a crank mechanism. SOLUTION: The device is equipped with a load device 1, a roller 2, a support rod 3, a truck 5, a rail 7, a movement device 8, a counterforce frame 9, and the like. In this configuration, the load device 1 in a vertical direction is interlocked to a post by the support rod 3, and a sample 4 on the truck 5 is moved by a driving device with the truck 5, thus actually evaluating the vibration and bridge beam of a traveling vehicle being generated by, for example, the influence of the unevenness of a road surface and the step of an expansion joint, the vibration problem of a structure, or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present test apparatus is a test apparatus which reproduces a load acting on a material and a member and applies the load over a certain range. For example, it is used for strength and fatigue endurance tests of materials and structures that are affected by fluctuating and moving loads, such as those encountered when running automobiles and trains.

[0002]

2. Description of the Related Art In a conventional similar structure testing apparatus (FIG. 2), a test piece is fixed and a load device 1 is moved. However, the structure of the reaction force frame 9 and the load device 1 becomes large and easy. It was not a test.

[0003]

In order to move the load device 1 smoothly and at a certain speed, it is necessary to firmly attach the load device 1 to the reaction frame 9, and to reduce the moment due to the horizontal force. It was considered necessary to support the tip of the load device 1.

[0004]

In this apparatus, a method is proposed in which a vertical load device 1 is connected to a support by a support rod 3 and a specimen 4 on the carriage is moved together with the carriage 5 by a drive unit. Testing has become possible in an easier way and under faster speed conditions.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present apparatus (FIG. 1) will be described. The specimen is a reinforced concrete beam with a fulcrum of about 2.0 m, and runs for 2.0 m under a constant load and a vibrating variable load. FIG. 3 shows a case where the vehicle is driven with a constant load, and FIG.
N, a vibration load having a sinusoidal waveform having an amplitude of ± 20% of 88.2 kN was applied at 2 Hz. The load and running conditions in both tests were ± 1.
It can be confirmed that the load variation of about 5 kN is faithfully reproduced. Therefore, the following test can be performed using the present mobile vibration fatigue test apparatus. (1) Test under constant load (Fig. 5a) (2) Test under running vibration load (Fig. 5b) (3) Test using other combinations

[0006]

According to the present invention, it can be expected that various structural tests can be easily performed with a practical load applied. For example, it is possible to more realistically evaluate the vibration of the traveling vehicle and the vibration of the bridge and the structure caused by the influence of the unevenness of the road surface and the step of the expansion joint.

[Brief description of the drawings]

FIG. 1 is a test apparatus of the present invention.

Fig. 2 Example of conventional test equipment

Fig. 3 Running test on reinforced concrete beams (constant load)

FIG. 4 Running test of reinforced concrete beams (vibration load)

FIG. 5 shows an example of a test method using a moving vibration fatigue test apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Load device 2 Roller 3 Support bar 4 Specimen 5 Dolly 6 Electric motor 7 Rail 8 Moving device 9 Reaction frame

Claims (1)

[Claims] An apparatus for performing a moving vibration fatigue test by reciprocating a specimen in a horizontal direction with a bogie and a crank mechanism in order to perform a strength / durability test of materials and members (FIG. 1).