Abstract
In the technical practice there is very often a need of axial force determination in the important structural elements of a building during its construction or operational state with adequate precision. The magnetoelastic method is one of the five experimental techniques usually used for that purpose in civil engineering practice. The modified magnetoelastic method is especially aimed on experimental evaluation of the axial forces in the prestressed steel reinforcements on prestressed concrete structures and it is usable not only for newly built structures but in particular for existing ones. New information and knowledge about practical application of the new approach based on the magnetoelastic principle is introduced in the paper. The results of three experiments are summarized, which were realized on the full locked cable PV 150 standardly used as a cable stay strand, on the MUKUSOL threadbar 15FS 0000 generally applied as a temporary prestressed reinforcement and on some prestressed tendons of an existing concrete road bridge, which is about thirty years old.
Highlights
IntroductionThe paper presents the latest knowledge and experience about the modified magnetoelastic method and brief results of its practical applications carried out by authors in the last year
The paper presents the latest knowledge and experience about the modified magnetoelastic method and brief results of its practical applications carried out by authors in the last year.The fundamental motivation of the research work of the authors is to research and develop a new approach based on the “magnetoelastic” physical principle and to transfer the obtained knowledge to practical applications
The new approach is in particular proposed for the experimental determination of axial forces in steel prestressed reinforcements on existing civil engineering structures made of prestressed concrete
Summary
The paper presents the latest knowledge and experience about the modified magnetoelastic method and brief results of its practical applications carried out by authors in the last year. The new approach is in particular proposed for the experimental determination of axial forces in steel prestressed reinforcements on existing civil engineering structures made of prestressed concrete. This task is very common nowadays in technical practice, especially on bridges, but other methods are generally not usable for that purpose or the difficulties with their applications are more significant and the. The measurable transverse displacement increases considerably the tensile force in the substantially short element It means the method is applicable with difficulty for the embedded prestressed reinforcement which is uncovered for the experiment purpose only minimally. The outcomes of three separate experiments are stated below in the text
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