Design method of multi-direction coupling slit gauge based on strain dynamic measurement

Abstract

The invention discloses a method for designing a multiway coupling crack meter based on dynamic strain measurement, which is applicable to measurement of static and dynamic multiway displacement of a local structural joint in a building and mechanical structure. The method is characterized by comprising the following steps: extracting two arc metal strain glass slides with similar shapes but different sizes from a crack side elevation (5); using a strain foil (3) on each glass slide as a unique measured value to analyze the magnitude of multiway displacement of the crack; and establishing a formula relation between the displacement of the crack in a stretched vertical direction and a slipped vertical direction and measured values of strain foils (3), according to the characteristics of linear independence among the measured values of the strain foils (3), thereby solving the strain value (3) in a system of linear equations to obtain a multiway displacement value among corresponding cracks. Only the strain dynamic measured value is used as accordance, thereby facilitating the monitoring of a crack deformation process in an earthquake and other short-time rapid loading processes. The multiway coupling crack meter has the advantages of simple structure, small dimension and low price, and is suitable for mass application in a small-scale structure or a model test at one time.

Description

technical field [0001] The invention belongs to the technical field of real-time monitoring of structural deformation in civil engineering and mechanical engineering, and is especially suitable for use in small-scale model tests of rapid loading such as earthquakes, and involves static and dynamic displacement of local structural joints such as reserved joints and structural joints. The design method of the opening measurement device, especially the design method of a multi-directional coupling crack gauge based on strain dynamic measurement. Background technique [0002] Under earthquake action, structural joints, reserved joints and other local structural joints will produce continuous changes in displacement. This displacement is reflected in multiple directions such as seam opening and misalignment. The magnitude of the displacement will be directly related to the integrity of the structure, thereby affecting the judgment of the continuous bearing capacity of the struct...

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Problems solved by technology

[0003] The invention provides a design method of a multi-directional coupling crack meter based on strain dynamic measurement, which overcomes that the existing combined multi-directional crack meter is not conducive to reflecting the influence of coupling displacement, and the unidirectional displacement meter is easily affected by displacement in other directions to generate values. The problem of changing; solving the problem that the existing multi-directional crack gauge is complex in structure, relatively large in size and expensive, which is not conducive to a large number of one-time use in small-scale structures or model tests; overcomes that the existing multi-directional crack gauge is mainly suitable for long-term Time-slowly changing conditions are not conducive to the monitoring of crack deformation under short-term strong motion conditions such as earthquakes

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