Small-sized three-span bridge buffering and vibration isolation platform based on magneto-rheological supporting seat and damper and design method

Abstract

The invention discloses a small-sized three-span bridge buffering and vibration isolation platform based on a magneto-rheological supporting seat and damper and a design method. According to the design method, similarity relations between a rigidity and damping-adjustable magneto-rheological supporting seat prototype and damper prototype and models are inferred based on the similar theory of dimensionless analysis and physical quantity dimensions which can reflect dynamic characteristics; with the similarity relations adopted, a small-sized magneto-rheological supporting seat and magneto-rheological damper which satisfy test requirements are designed; similarity relations between a three-span bridge vibration isolation prototype system and a small-sized bench model system can be inferred; and based on the similarity relations, the small-sized magneto-rheological supporting seat and damper are adopted to complete the design of the bench model. The platform of the invention integrates active vibration isolation, passive vibration isolation and bridge vibration isolation measurement and control, and has the advantages of multi-functional performance, strong compatibility, high reference value, reasonable design and the like. With the platform and the design method adopted, a magneto-rheological material-based bridge vibration isolation test can be effectively completed, and strong support can be provided for the improvement of bridge vibration isolation platform techniques.

Description

technical field [0001] The invention belongs to the technical field of building and bridge vibration isolation, and in particular relates to a design method and device for a small-scale three-span bridge buffer vibration isolation platform based on a magnetorheological support-damper. Background technique [0002] In the impact protection design of bridges, the plane buffering and vibration isolation capacity of the structure is usually improved by increasing the strength of the structure itself or using passive rubber bearings. However, under sudden loads (such as earthquakes, plane impact vibrations, etc.), passive rubber bearings cannot adjust their own lateral stiffness and increase strength to reduce the destructive displacement of the structure under the action of large horizontal shear forces, nor can they produce Larger deformation damping is used to dissipate the instantaneous impact energy; and the method of combining traditional passive bearings and dampers genera...

AI Technical Summary

Problems solved by technology

However, due to the physical research of large-scale engineering projects in the laboratory, there are disadvantages such as difficult operation, high cost, and difficulty in realization, and the simple geometric similarity cannot reflect the dynamic characteristics of the actual engineering system, etc.

Images