FEM analysis of bond between concrete and seven-wire prestressing strand / Marcin Dyba // IOP Conference Series: Materials Science and Engineering [Dokument elektroniczny]. – 2020, Vol. 960, No 3, 8 ... więcej

FEM analysis of bond between concrete and seven-wire prestressing strand / Marcin Dyba // IOP Conference Series: Materials Science and Engineering [Dokument elektroniczny]. – 2020, Vol. 960, No 3, 8 s. : rys., tab., wykr. – Tryb dostępu: https://iopscience.iop.org/article/10.1088/1757-899X/960/3/032077/pdf. – Oznaczenie ref./art.: 032077. – Bibliogr. 5 poz., Abstr. – Mat. konf.: 5th World Multidisciplinary Civil Engineering-Architecture-Urban Planning Symposium – WMCAUS, Prague, Czech Republic, 15-19.06.2020. – doi: 10.1088/1757-899X/960/3/032077. – ISSN 1757-899X

Detailed FEM analysis of the pull-out test of seven-wire prestressing strand form concrete sample is the purpose of the article. A 3D numerical model of a seven-wire prestressing strand concreted in the ... więcej

Detailed FEM analysis of the pull-out test of seven-wire prestressing strand form concrete sample is the purpose of the article. A 3D numerical model of a seven-wire prestressing strand concreted in the concrete cube was made. The assumption of the most trusted modeling of the strand geometry for numerical calculations was assumed. The mechanical parameters of the materials and interface elements for analysis were adopted based on the results obtained from the experimental tests previously carried out by the author. As a result of numerical calculations, it was possible to trace the deformation state, stresses and cracking as well as their development along with the change of the strand displacement in the sample. The images of deformations and stresses in the sample confirmed theoretical considerations and suppositions from experimental tests about its accumulation of the largest values in longitudinal concrete wedges in the closest cover of the strand. During the test, the concrete inside the cube cracked quickly. The first cracks appear in the zone of the nearest cover of the strand. Numerical analysis made it possible to observe both the failure mechanisms identified in the experimental tests. The first mechanism consisted in cutting the longitudinal concrete wedges between the individual wires. The second mechanism was based on the rotation of the strand and its slip along the route of the twist.