CN203929356U

CN203929356U - Large scale Segment Model test unit

Info

Publication number: CN203929356U
Application number: CN201320656728.0U
Authority: CN
Inventors: 丁静; 廖海黎; 马存明; 李明水
Original assignee: Southwest Jiaotong University
Current assignee: Southwest Jiaotong University
Priority date: 2013-10-23
Filing date: 2013-10-23
Publication date: 2014-11-05
Anticipated expiration: 2023-10-23

Abstract

Large scale Segment Model test unit, so that test Reynolds number more approaches real bridge, also can simulate girder details more accurately, accurately to hold girder vortex-induced vibration performance, guarantees normal operation and the structural safety of bridge.It comprises: support (10), has air intake and outlet air end; Steel disc (50), Segment Model (20) both sides are connected with a steel disc (50) respectively by bolt, and it is upper that both sides steel disc (50) is respectively suspended on support (10) by upper extension spring group, lower stretching groups of springs, forms Vibrating System with Two Degrees of Freedom; Segment Model (20) adopts the geometry scaling factor of 1:15～1:20.

Description

Large scale Segment Model test unit

Technical field

The utility model relates to wind tunnel test equipment, relates in particular to a kind of large scale Segment Model test unit.

Background technology

Under natural wind effect, can there is whirlpool and impulse moving in bridge main beam, although there is character and the very large destruction of dispersing unlike flutter, but also can affect comfortableness during bridge operation and the operating condition during bridge erection, when serious, also can cause structural fatigue.Wind force proofing design need to accurately estimate girder vortex-induced vibration amplitude and occur wind speed, and by vortex-induced vibration amplitude in permissible range.

At present girder vortex-induced vibration is estimated, conventional means is to carry out conventional yardstick (1:60 left and right) Section model wind tunnel test.The model adopting due to this class test is less, reynolds number effect and girder details are simulated not meticulously, often cause test findings (amplitude and occur wind speed) and real bridge situation quite different, thereby cause the erroneous judgement to real bridge wind resistance, cause the invalid or waste economically of vibration reducing measure.

Utility model content

Technical problem to be solved in the utility model is to provide a kind of large scale Segment Model test unit, so that test Reynolds number more approaches real bridge, also can simulate more accurately girder details, accurately to hold girder vortex-induced vibration performance, guarantee normal operation and the structural safety of bridge simultaneously.

The utility model large scale Segment Model test unit, comprising: support, has air intake and outlet air end; Steel disc, Segment Model both sides are connected with a steel disc respectively by bolt, and both sides steel disc is respectively suspended on support by upper extension spring group, lower stretching groups of springs, forms Vibrating System with Two Degrees of Freedom; Segment Model adopts the geometry scaling factor of 1:15～1:20.

The beneficial effects of the utility model are, test model is larger, can investigate compared with the vortex-induced vibration performance that becomes bridge state girder under high reynolds number condition, and whirlpool under the different structure damping ratio situation of shaking, the whirlpool that more approaches real bridge in the hope of obtaining shakes and locks wind speed and amplitude, has held exactly the vortex-induced vibration performance of girder, can be in the situation that amplitude meets the demands, girder is taked effectively to press down vibration means research, guarantee normal operation and the structural safety of bridge.

Brief description of the drawings

This instructions comprises following two width accompanying drawings:

Fig. 1 is the structural representation of the utility model large scale Segment Model test unit;

Fig. 2 is the cut-open view along A-A line in Fig. 1.

Member shown in figure and corresponding mark thereof: support 10, Segment Model 20, extension spring 30, water conservancy diversion tuyere 40, steel disc 50.

Embodiment

Below in conjunction with drawings and Examples, the utility model is further illustrated.

With reference to Fig. 1 Fig. 2, the utility model large scale Segment Model test unit, comprising: support 10, has air intake and outlet air end; Steel disc 50, Segment Model 20 both sides are connected with a steel disc 50 respectively by bolt, and both sides steel disc 50 is respectively suspended on support 10 by upper extension spring group, lower stretching groups of springs, forms Vibrating System with Two Degrees of Freedom; Segment Model 20 adopts the geometry scaling factor of 1:15～1:20, and the thin portion such as bridge floor anticollision barrier, pinner, hand banisters, maintenance track member all can be more accurate in analog.Because the model under this scaling factor is larger, also higher for the requirement of wind tunnel laboratory, need to make wind-tunnel blocking rate be less than testing requirements.

See figures.1.and.2, conventionally, described upper extension spring group, lower stretching groups of springs respectively comprise 2 extension springs 30 that are arranged on steel disc 50 two ends.In view of whirlpool shakes, conventionally to send out the wind speed that shakes lower, is to reduce model wind speed ratio, adopts extension spring 30 that rigidity is larger to improve the natural frequency of vibration of model.Quality is similar to be realized by the mode that installs counterweight at model two ends additional.

With reference to Fig. 2, the air intake of described support 10 and outlet air end are all installed with water conservancy diversion tuyere 4, when avoiding, at two ends, test bracket is set on testing the impact of even wind field.

Some principles of the above the utility model large scale Segment Model test unit that just explains through diagrams, be not the utility model to be confined to shown in and in described concrete structure and the scope of application, therefore the corresponding modify being likely utilized every and equivalent, all belong to the scope of the claims that the utility model is applied for.

Claims

1. large scale Segment Model test unit, is characterized in that it comprises: support (10), has air intake and outlet air end; Steel disc (50), Segment Model (20) both sides are connected with a steel disc (50) respectively by bolt, both sides steel disc (50) is respectively suspended on (10) on support by upper extension spring group, lower stretching groups of springs, forms Vibrating System with Two Degrees of Freedom; Segment Model (20) adopts the geometry scaling factor of 1:15～1:20.

2. large scale Segment Model test unit as claimed in claim 1, is characterized in that: described upper extension spring group, lower stretching groups of springs respectively comprise 2 extension springs (30) that are arranged on steel disc (50) two ends.

3. large scale Segment Model test unit as claimed in claim 1 or 2, is characterized in that: the air intake of described support (10) and outlet air end are all installed with water conservancy diversion tuyere (40).