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Abstract

The work concerns numerical – experimental studies on pre- and post-buckling of thin-walled, steel, cylindrical shells, with the open section, subjected to constrained torsion. Two geometrically varied structures are considered: an open section cylindrical shell without stiffeners and one that is reinforced by closed section stringers. The shells have five different length to diameter ratios. Numerical simulations were carried out and the neuralgic zone stress distributions in pre- and post-buckling responses, were determined. Torsion experiments were performed and the results were compared to the numerical conclusions, with reasonably high level of agreement. The exactness of the experiment was proven for selected cases, establishing the basis for FEM numerical model estimation.

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Authors and Affiliations

Tomasz Kopecki
Hubert Dębski
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Abstract

An in-situ nanoindenter with a flat tip was employed to conduct buckling tests of a single nanowire with simultaneous SEM imaging. A series of SEM images allowed us to calculate deflection. The deflection was confronted with the mathematical model of elastica. The post-buckling behaviour of nanowires is conducted in the framework of the nonlinear elasticity theory. Results show the significant effect of geometrical parameters on the stability of buckled nanowires.
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Authors and Affiliations

Aleksandra Manecka-Padaż
1
ORCID: ORCID
Piotr Jenczyk
1
ORCID: ORCID
Ryszard B. Pęcherski
1
ORCID: ORCID
Anna Nykiel
2
ORCID: ORCID

  1. Institute of Fundamental Technological Research Polish Academy of Sciences, Poland
  2. Institute of Nuclear Physics Polish Academy of Sciences, Poland
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Abstract

The analysis of web-corrugated and trapezoidal profiled web girders focuses on the description of buckling resistance, possibly the ultimate resistance neglecting the post-buckling resistance reserve of girders. The problem is still the post-buckling resistance reserve and its possible application in practice. For this purpose this paper presents the analysis of tests on shear resistance of the corrugated web of SIN girders with the support stiffeners in the pre- and post-buckling zones. There are also presented values of the post-buckling resistance zone and the mutual relationships between pre- and post-buckling resistance zones. Values of these zones are related to optimization of the web-corrugated girders, which consists in enlarging the zone of pre-critical resistance and balancing between shear resistance and bending resistance. The experimental tests were performed on 20 girders with the following web depth: 500, 1000, 1250, and 1500 mm, composed of three pre-assembled units. The girders with a simply supported beam system and a simply supported beam with a single cantilever were made of pre-assembled units joined by means of high strength preloaded bolts. The numerical analysis by FEM was conducted for the models with web depth from hw = 500 to 1500 mm at the full range of web thickness 2,0; 2,5, and 3 mm. The tests showed that stiffness of the support stiffeners in the web-corrugated girders had an impact on the size of pre- and post-buckling resistance zones, which consequently reduced the zone of post-buckling resistance. Because the initiated loss of stability of the corrugated-web girders is an irreversible and rapid process, and the resulting displacements in the non-linear area are permanent, the application of the post-buckling resistance zone in practice can be troublesome. From the standpoint of the structural reliability, however, the post-buckling zone provides a yield delay, i.e. it may be regarded as a safety margin. Therefore, its most possible reduction is required.
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Authors and Affiliations

Witold Basiński
1
ORCID: ORCID

  1. Silesian University of Technology, Faculty of Civil Engineering, ul. Akademicka 5, 43-300 Gliwice, Poland

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