CN203688194U - Angle of wind deflection conversion device for large-span bridge wind tunnel testing - Google Patents

Abstract

Long-span bridge wind tunnel test wind angle conversion device, to easily move the long-span bridge wind tunnel test model, change its wind angle, and study the wind-induced vibration phenomenon under different wind angles, which can effectively avoid adverse effects on the structure . It includes: a supporting steel plate, used to support and fix the test model; a mobile trolley, arranged at intervals along the supporting steel plate and detachably connected with the supporting steel plate.

Description

Wind angle conversion device for long-span bridge wind tunnel test

technical field

The utility model relates to wind tunnel testing equipment, in particular to a conversion device for wind deflection angle testing in wind tunnels of long-span bridges.

Background technique

For long-span bridges, it is often necessary to use wind tunnel tests to study the wind resistance performance. Among them, the aeroelastic model test of the full bridge can more truly reflect the aerodynamic stability and wind-induced vibration response of the bridge structure in the actual atmospheric boundary layer. In the wind tunnel test, the chattering of the whole bridge is often studied more. Since the chattering is a kind of amplitude-limiting vibration with high frequency, although it will not cause bridge damage accidents, it will cause structural fatigue; too large amplitude may even endanger the bridge. Driving safety. The most unfavorable situation of buffeting response is not necessarily in the case of normal wind, but may occur under the action of oblique wind with a certain wind angle.

Among various wind-induced vibration phenomena, flutter is the most dangerous divergent self-excited vibration phenomenon. It is generally considered that when the incoming wind direction is perpendicular to the bridge span, the flutter critical wind speed is the lowest, which is the most unfavorable. However, the natural wind at the bridge site is seldom perpendicular to the bridge axis, and often forms a deflection angle. Relevant studies have shown that the lowest flutter critical wind speed of the bridge may occur in the oblique wind whose average share forms a certain deflection angle with the bridge span. Such as flat box girder. In the case of a non-zero angle of attack, the traditional normal wind is not the most unfavorable working condition, so it is necessary to consider the flutter critical wind speed at various wind angles to find the minimum flutter critical wind speed, which can be carried out safely bridge design.

When using the full-bridge aeroelastic model to conduct wind tunnel tests on the buffeting response and flutter of the bridge, in the past, due to the lack of flexible adjustment devices for deflection angle and angle of attack, especially in large boundary layer wind tunnels, the model is relatively large, and the model It is difficult to change the windage angle, and it is easy to cause damage to the model due to artificial movement. Therefore, the influence of windage angle and wind angle of attack is less considered, and often only the test of 0° deviation angle is carried out.

Utility model content

The technical problem to be solved by the utility model is to provide a long-span bridge wind tunnel test wind angle conversion device, so as to conveniently move the long-span bridge wind tunnel test model, change its wind angle, and study the wind induced by different wind angles. Vibration phenomena can effectively avoid adverse effects on the structure.

The technical solution adopted by the utility model to solve its technical problems is as follows:

The wind deflection angle conversion device for long-span bridge wind tunnel test of the utility model is characterized in that it comprises: a supporting steel plate for supporting a fixed test model; a moving trolley is arranged at intervals along the supporting steel plate and is detachably connected with the supporting steel plate.

The beneficial effect of the utility model is that the test model can be fixed on the device, and the model can be moved conveniently in the wind tunnel laboratory, and the wind deflection angle can be changed by it. Compared with the previous direct moving and rotating model, It can effectively avoid damage to the structure, and it is easier to operate.

Description of drawings

This manual includes the following two drawings:

Fig. 1 is the top view of the utility model long-span bridge wind tunnel test wind angle conversion device;

Fig. 2 is the front view (partial) of the wind deflection angle conversion device for the wind tunnel test of the long-span bridge of the present invention;

The parts and corresponding marks are shown in the figure: unit steel plate 11 , connecting steel plate 12 , connecting bolt 13 , vehicle frame 21 , wheel axle 22 , fixing bolt 23 .

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

With reference to Fig. 1 Fig. 2, the utility model long-span bridge wind tunnel test wind deflection angle conversion device comprises: supporting steel plate, is used for supporting fixed test model; Mobile trolley, is arranged at interval along supporting steel plate and is detachably connected with supporting steel plate.

Described mobile trolley is made of vehicle frame 21 and the axle 22 that is installed on its transverse two ends, and axle 22 is positioned at the lateral side of supporting steel plate. In order to simplify the structure, the vehicle frame 21 can be a grooved steel plate, which is detachably connected to the supporting steel plate through fixing bolts 23 arranged at intervals along its longitudinal direction. The supporting steel plate is formed by longitudinal splicing of at least two connecting steel plates 12 . In order to easily meet the needs of test models of different sizes, two adjacent connecting steel plates 12 of the supporting steel plate are provided with overlapping connecting steel plates 12 , and are detachably connected as a whole by connecting bolts 13 .

When in use, the entire test model is first installed on the conversion device, and the bridge tower is connected to the device through bolts, and connecting steel plates are arranged at the bottom of the bridge tower and auxiliary piers, etc., and bolted directly with bolts. The entire device center is then connected to a turntable center in the wind tunnel laboratory. When it is necessary to change the windage angle, tighten the fixing bolts 23 on each mobile trolley, the whole supporting steel plate will be lifted off the ground, then put a rope on the fixing bolts 23 of the mobile trolley at the two ends of the supporting steel plate of the device, and rotate. After turning an angle, the fixing bolt 23 is unscrewed, and the conversion device sticks to the ground for fixing.

The above are just some principles of the utility model long-span bridge wind tunnel test wind angle conversion device with illustrations, not to limit the utility model to the specific structure and scope of application shown and described, so all Corresponding modifications and equivalents that may be utilized all belong to the patent scope of the utility model application.

Claims (5)

1. The wind deflection angle conversion device for long-span bridge wind tunnel test is characterized in that it comprises: a supporting steel plate for supporting a fixed test model; a moving trolley is arranged at intervals along the supporting steel plate and is detachably connected with the supporting steel plate. the 2. The long-span bridge wind tunnel test wind angle conversion device according to claim 1, characterized in that: the mobile trolley is composed of a vehicle frame (21) and a wheel shaft (22) installed at both lateral ends of the car, the wheel shaft ( 22) Located outside the lateral side of the supporting steel plate. the 3. The long-span bridge wind tunnel test windage angle conversion device according to claim 2, characterized in that: the vehicle frame (21) is a grooved steel plate, and fixed bolts (23) arranged at intervals along its longitudinal direction ) is detachably connected with the supporting steel plate. the 4. The wind angle conversion device for wind tunnel testing of long-span bridges according to any one of claims 1 to 3, characterized in that: the supporting steel plate is composed of at least two connecting steel plates (12) spliced longitudinally. the 5. The wind angle conversion device for wind tunnel test of long-span bridges according to claim 4, characterized in that: the connecting steel plates (12) overlapping with the connecting steel plates (12) are arranged between the two adjacent connecting steel plates (12) of the supporting steel plates, and It is detachably connected as a whole by connecting bolts (13). the

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