Working method of experiment system for bridge

Abstract

The invention discloses a working method of an experiment system for a bridge. The experiment system comprises a fan, an air suction port, an air blowing port, a control valve, an air filter, a main beam segment model and a control unit. The working method comprises a testing method and an adjusting method. The test method comprises the following steps: step 1, the control unit controls the fan to work to output gas and blow the gas to the edge, and the acceleration sensor and the anemograph are arranged on the lower surface of the main beam segment model; 2, when a numerical value sensed by the acceleration sensor reaches a preset value in a database, the external air blowing equipment and the external air suction equipment are started, and the external air blowing equipment and the external air suction equipment are each connected with a flow meter; 3, the anemograph and the flow meter collect data and output the data to the controller.

Description

technical field [0001] The invention relates to the field of bridge vortex vibration experiments, in particular to a working method of an experimental system for bridges. Background technique [0002] With the increasing span of bridges, wind-induced vibration has gradually become the main factor restricting the further development of long-span bridges. Vortex vibration is a self-limiting wind-induced vibration phenomenon with dual characteristics of forced and self-excited, which is caused by the regular vortex shedding generated when the airflow passes through the surface of the structure. The phenomenon of vortex vibration of bridge girders is common in practical engineering, such as the Rio-Niteroi Bridge in Brazil, the Trans-Tokyo Bay Bridge in Japan, and the Great Belt Bridge in Denmark. East Belt Bridge), Volga Bridge in Russia, Verrazzano-Narrows Bridge in the United States, Xihoumen Bridge, Humen Bridge and Yingwuzhou Bridge in China all appeared in the course of o...

AI Technical Summary

Problems solved by technology

[0004] 1. The experimental system of the prior art controls the wind force through a valve. However, the wind force in the actual situation is often changing rapidly, and there are too many wind force changes, which cannot be simulated one by one.

[0005] 2. In the valves of the prior art, there are composite spools, but the composite spool is often the inner spool as an auxiliary valve, the outer spool as the main valve, and the inner spool is often processed due to its small volume. Difficulty, and the functions and execution area that the small-volume spool can perform are small, which affects the effect

[0006] 3. The valves in the prior art can adjust the flow through the degree of opening and closing, but the control of the degree of opening and closing requires manual or machine control, which greatly increases the cost

[0007] 4. After the spool of the prior art is used for a long time, there will be fouling or maintenance is required. At this time, the spool needs to be disassembled, and the procedure is relatively cumbersome

[0008] 5. The spool through hole of the prior art is often square or circular, ignoring the characteristics of the oval through hole and the benefits brought by the cooperation of different shapes of through holes

[0009] 6. In the multi-channel rotary valve of the prior art, due to too many channels, the gap between the channels is greatly reduced for each additional channel, and there are less places for sealing, which brings difficulties to the processing and installation of the sealing structure

[0010] 7. The valves in the prior art work through a single drive, and there are few double drives, because the support and vibration of the drive parts are a big problem when the double drive is used

[0011] 8. The living and industrial valves in the existing technology are often set separately, but the experimental valve is just the opposite. Because the experimental valve simulates the actual situation but the ratio is greatly reduced, there is an integration requirement for the experimental valve, and ordinary valves obviously cannot meet the integration requirements.

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