Dynamic strain measurement-based large-amplitude rotation angle measurement instrument and using method thereof

Abstract

The invention discloses a dynamic strain measurement-based large-amplitude rotation angle measurement instrument and a using method thereof, and belongs to the technical field of real-time monitoring of engineering structure deformation. The dynamic strain measurement-based large-amplitude rotation angle measurement instrument and the using method are characterized in that: two eccentric arc metal strain slides which have the similar shapes and are embedded with each other are led out of directional chutes of a vertical rigid slab and a horizontal rigid slab of a hinge bracket; and solved linear equations of the coupled deflection formed by the rotation angle phi between the rigid slabs of the bracket and the displacement ur of the end parts of the strain slides along the direction of the directional chutes are established based on the linear independence between two strain slide measurement values, wherein the rotation angle phi between the rigid slabs of the bracket is the rotation angle of the structure to be solved. The dynamic strain measurement-based large-amplitude rotation angle measurement instrument and the using method thereof only use the dynamic strain measurement value as the basis, have single measured value, are favorable for monitoring the structural large-amplitude angle variation in explosion, earthquakes, and other reciprocating destructive load action; and the instrument has the advantages of simple structure, small dimension and low price, and is convenient to use in small-scale structural vibration model tests for one time.

Description

technical field [0001] The invention belongs to the technical field of real-time monitoring of deformation of civil and mechanical engineering structures, and is especially suitable for dynamic measurement of angles under the action of rapid reciprocating loads such as earthquakes and explosions. , especially a large-scale rotation angle measuring instrument based on strain dynamic measurement and a method of use thereof. Background technique [0002] Under the action of destructive dynamic loads such as earthquakes and explosions, the rotation angle between components is one of the important parameters for structural deformation monitoring, especially after the rotation part enters a plastic nonlinear mechanical state, it is of great significance for evaluating the overall safety of the structure. At present, in the field of angle measurement at home and abroad, mechanical or optical angle measuring instruments based on protractors are mainly used. Among them, mechanical a...

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Problems solved by technology

[0003] The present invention will provide a large-scale rotation angle measuring instrument based on strain dynamic measurement and its use method, which overcomes the complex structure, relatively large size and high price of existing mechanical and optical angle measuring instruments, which are not conducive to small-scale structures or models. The problem of one-time large-scale use in the test; overcomes the problem that the existing angle measuring instrument is mainly suitable for long-term slow-changing load conditions, which is not conducive to the monitoring of structural angle deformation under short-term strong dynamic conditions such as earthquakes and explosions

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