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Metodyka badania elementów kablobetonowych z wykorzystaniem komplementarnych metod nieniszczących

Czarnecki Sławomir, Hoła Anna, Hoła Jerzy, Sadowski Łukasz

Inżynieria i Budownictwo

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2023

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R. 79, nr 5-6

288--292

PL

Artykuł przedstawia opracowaną metodykę i badania elementów kablobetonowych z wykorzystaniem komplementarnych metod nieniszczących elektromagnetycznej tomografii ultradźwiękowej oraz młoteczkowej. Metodyka ta jest przydatna przede wszystkim w zakresie badania położenia kabli sprężających w elementach kablobetonowych oraz badaniach szczelności wypełnienia kanałów kablowych iniektem cementowym. Jej przydatność dla praktyki została poparta zamieszczonymi w artykule przykładowymi rezultatami badań wielkowymiarowego dźwigara kablobetonowego w budynku trzonolinowym.

EN

The article presents the developed methodology for testing post-tensioned concrete elements using complementary non-destructive electromagnetic, ultrasonic and hammer tomography methods. This methodology is useful primarily in the field of testing the position of prestressing cables in post-tensioned concrete elements and testing the tightness of filling cable channels with cement grout. Its usefulness for practice was supported by the exemplary results of the research of a large-size post-tensioned concrete girder in a trefoil building, presented in the article.

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Simulation based reliability assessment of cable structures

Kmet S., Tomko M., Brda J.

Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska

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2004

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z. 37[211], cz.1

179-188

EN

The intention of the paper is to illustrate the ability of the probabilistic time-dependent reliability assessment procedure applied to non-linear suspended cable structure with rheological properties, when a rope made from the high strength synthetic fibres is used. Attention is turned to the individual main steps in the assessment procedure, i. e. to the selection of an appropriate method of structural analysis, analysis of random variables representing individual actions, evaluation of the structural response with respect to the interaction of the random variables considering a history of the time-dependent action effects and to the definition of the limiting values considering serviceability of cable structure. The potential of the method using direct Monte Carlo technique as one of the possible alternatives for simulation-based time-dependent reliability assessment as a powerful tool is emphasized. The influence of an excessive deflection of suspended cable (caused by creep of cable and rheologic changes) on its serviceability in required time is investigated and illustrative examples are performed.

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Reologia predpatych dvojpasovych lanovych sustav

Kokorudowa Z.

Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska

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2000

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z. 32[180], cz.1

255-262

EN

Statical solution of the viscoelastic cable trusses is based on the assumptions, that the cable truss load is vertical and distributed along the horizontal projection of the truss, the chords are not clamped together at midspan and only cable trusses with vertical spacers. Vertical elements of the trusses are considered inextensible and repleced by a continuous diafragm. All the geometrical quantities, forces, equations of compatibility, physical and constitutive equations, just as the equations of state and deflexion of the cable trusses are the function of time and stress under nonlinear creep of the cable.