GMNIA-Based Evaluation of Cable-Prestressed H-Shaped Steel Columns
Source abstract
Abstract
The strengthening technique by external cable prestressing, until now limited to columns with circular hollow sections (CHSs), is here extended to H-shaped steel columns. To provide an innovative general treatment, an initial imperfection, obtained from the analytical equivalence between Eurocode 3 and Ayrton–Perry formulations, is introduced. By this, a geometrically and materially nonlinear imperfection analysis (GMNIA) is performed by the finite element commercial code Abaqus. A parametric analysis identifies the deviator length, cable tension, and slenderness ratio as key parameters. Results confirm that, on the one hand, cable prestressing yields a critical load that is approximately twice that for non-prestressed elements (680 kN against 340 kN for a beam 8 m long); this effect grows with the column length. On the other hand, a simulation on a two-story frame supported by 12 columns, each 4 m long, spaced by 4 and 6 m in the two directions, under vertical ‘dead’ load shows that prestressed HEA200 columns perform as non-prestressed larger HEA220 profiles; thus, their use in this case leads to saving approximately 1.18 tons of steel; both these results are of practical interest in design of steel structures.
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Research context
OpenAlex topics: Structural Load-Bearing Analysis · Structural Health Monitoring Techniques · Structural Engineering and Vibration Analysis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Laboratory of Structures and Advanced Materials in Civil Engineering and Public Works, University of Sidi Bel Abbes, Sidi Bel Abbes 22000, Algeria
Department of Structural and Geotechnical Engineering, University “La Sapienza”, 00184 Rome, Italy
Funding
Italian Ministry of University and Research
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