Abstract
We used the mirrorshadow method for the diagnostics of stressedstrained state of shaped sections of metal structures. It was found that in the course of implementation of this method there may occur an error that is caused by misalignment of measurement with the dimension of acoustic receiving transducer. The work considers the effect of change in the geometry of shaped sections under the action of maximum permissible stress on the displacement of the point at which a beam of ultrasound wave arrives. We examined a question of influence of the slope of inner edge of the shelf of a shaped section on the displacement of the point of ultrasonic wave’s arrival sideways from the center of receiving transducer. As a result of analytical studies, it was proved that changing geometric dimensions of control object practically does not affect displacement of the point of arrival of the beam from the center of the receiving transducer. It was found that for a number of shaped sections that have slopes of internal edges of the shelves, it is necessary to introduce correction of position of the receiving transducer relative to the emitting transducer by such parameters as angle and distance relative to the anchor point. Performed research is a prerequisite for the development of design of the block of piezoelectric transducers for implementation of the system of acoustic diagnostics of the strained state of shaped sections.
Highlights
With the increasing pace of construction, there is a growing need for the development and use of new methods and means to ensure their integrity, reliability, performance efficiency, safety, which will make it possible to conduct in a short time diagnostics of critical elements of constructions
The main indicator of technical condition of a building, which is responsible for its performance, is the stressedstrained state (SSS) of structural elements
For the shaped sections that have plane-parallel edges of shelves, double-T profile and hot rolled double-T profile, we considered deflection of the center of the beam from the center of piezo acoustic transducer of deviation
Summary
With the increasing pace of construction, there is a growing need for the development and use of new methods and means to ensure their integrity, reliability, performance efficiency, safety, which will make it possible to conduct in a short time diagnostics of critical elements of constructions. The main indicator of technical condition of a building, which is responsible for its performance, is the stressedstrained state (SSS) of structural elements. To ensure integrity of a structure, it is necessary to carry out current control of the technical condition by identifying real values of the stresses in places of their concentration [5, 6]. Of particular importance is the development of operational methods of non-destructive control, which would allow diagnosing the value of SSS of SS with high reliability. The relevance of the work is in a comprehensive study of the impact of SSS and the SS geometry on the change in the measurement base for the entire nomenclature row of SS, which will enable designing means for diagnosing SSS of SS under operation conditions
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