An elastic gap type viscous damper used on highway bridges

Abstract

The invention relates to an elastic gap type viscous damper used on a highway bridge. A damping ring made of a low-modulus elastic material sleeves a piston and is fixed to the outside of the piston through a fastener. A piston rod moves relative to the axial direction of a cylinder to drive the piston and the damping ring fixed to the piston to move synchronically in a cavity between a left seal guide unit and a right seal guide unit to further squeeze energy consumption liquid to flow through a gap between the damping ring and the wall of the cylinder at high speed, so that the viscous shear stress and the associated pressure stress are produced in the gap, the damping ring is compressed by the pressure stress and performs radial shrinkage strain, and the gap is expanded to improve the energy consumption efficiency of the damper accordingly. The elastic gap type viscous damper used on the highway bridge solves the problems of high design and machining difficulty, sudden damping force decreasing, high damper mounting requirements and the like of a common variable gap damper.

Description

technical field [0001] The invention relates to the field of viscous damper design, in particular to a damper, in particular to an elastic gap viscous damper used on highway bridges for reducing deformation and other effects of highway bridge equipment under vibration loads. damper. Background technique [0002] Typical viscous dampers are divided into two types: pore type and gap type. The basic principle is to convert the relative deformation and relative motion speed between the external components into the deformation and motion speed of the piston in the damper relative to the cylinder, so that the internal friction of the cylinder The energy-consuming liquid flows through the narrow pores or gaps at high speed under the action of extrusion, resulting in large viscous shear force and shear displacement, which leads to a large amount of heat generation of the energy-consuming liquid, and realizes the kinetic energy of the building or equipment to dissipate the internal e...

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Problems solved by technology

[0003] Gap type dampers are divided into fixed gap type and variable gap type. The gap between the cylinder wall and the outer surface of the piston of the fixed gap type viscous damper always maintains a fixed value and does not change. The disadvantage is that the hysteresis curve of the product is relatively poor. Relatively low energy efficiency

The variable clearance viscous damper needs surface processing on the outer surface of the piston and inside the cylinder wall. The modeling of the surface function is complicated, the processing technology is difficult, and it is difficult to maintain stable product quality; the hysteresis curve of the stepped clearance damper runs on the piston. The damping force tends to decrease significantly when the speed is the highest, and it is difficult to meet the requirement of "full energy consumption curve"; the most important thing is that the two types of variable clearance dampers have obvious position correlation, that is, the piston must be The purpose of design and manufacture can only be met if it is located in the central symmetrical position of the gap structure, and the error requirements of building construction obviously cannot meet the error requirements of product installation. Therefore, there are big problems in the application of the above two types of products in the field of construction engineering

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