Control system and control method for bridge installed with viscous damper

Abstract

The invention discloses a control system and a control method for a bridge equipped with a viscous damper. The control method includes the following steps: Step 1: Install the viscous damper between the pier and the beam end of the bridge in advance; the viscous damper The device includes a cylinder and a piston that can reciprocate in the cylinder. The piston is provided with a plurality of passages connecting both sides of the piston, and a switch assembly with the same number of passages. The switch assembly includes a switch for conducting or blocking the passage. part and a driver connected with the switch part; step 2: collect the current motion parameters of the beam end; step 3: calculate the number of channels to be cut off according to the preset reference motion parameters and the collected current motion parameters, and generate The driving signal is used to control the driver to drive the switching element to turn on or cut off the corresponding channel. The purpose of the present invention is to drive each driver to turn on or cut off each channel according to the motion state of the detected beam end, dynamically adjust the damping force, and reduce the longitudinal cumulative displacement of the beam end.

Description

technical field [0001] The invention relates to the technical field of bridge design, in particular to a control system of a bridge equipped with a viscous damper and a control method thereof. Background technique [0002] Long-span suspension bridges produce significant longitudinal displacements at the beam ends of the stiffening beams under the action of vertical live loads, which is a feature of the structure itself. Taking the driving of the car on the main beam as an example, unlike the wind load or the earthquake load, the driving of the car is a daily behavior, so the longitudinal displacement of the beam end is continuous, that is, if there are vehicles on the suspension bridge, the main beam of the suspension bridge will be uninterrupted. The longitudinal reciprocating movement of the ground also leads to a large cumulative displacement of the beam end of the main beam. [0003] The harm caused by the frequent reciprocating longitudinal movement of the main girder...

AI Technical Summary

Problems solved by technology

Taking the driving of a car on the main girder as an example, unlike wind load or earthquake load, the driving of a car is a daily behavior, so the longitudinal displacement of the beam end is continuous, that is, there is a vehicle running on the suspension bridge, then the main girder of the suspension bridge will be uninterrupted The longitudinal reciprocating movement of the ground also leads to a large cumulative displacement of the beam end of the main beam

[0003] The hazards of frequent longitudinal reciprocating and large movements of the main girder are mainly manifested in the substantial deterioration of the bearings, expansion joints, and suspension bridge cables, seriously affecting their durability, reducing the service life of the bearings, expansion joints, and suspension bridge cables, and increasing the operation of the suspension bridge. security risk during

[0004] In the prior art, longitudinal limit devices are mostly installed at both ends of the main beam to reduce the maximum displacement of the beam end. However, these longitudinal limit devices have a limited reduction in the cumulative displacement of the beam end. For example, the patent number is ZL201611992980.7 , the authorized invention patent titled "a bridge equipped with a viscous damper", which solves the technical problem that the abutment structure cannot bear the huge tension under the dynamic load, making the abutment easy to damage and poor in structural stability

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