1. Experimental tests for the evaluation of the seismic performance of the innovative CFS wall.
- Author
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Campiche, Alessia, Tartaglia, Roberto, Fiorino, Luigi, and Landolfo, Raffaele
- Subjects
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LIGHTWEIGHT steel , *COLD-formed steel , *SEISMIC testing , *EARTHQUAKE zones , *WALLS , *STEEL bars , *LATERAL loads - Abstract
• The paper present the experimental tests results performed within the ECCLISSA research project, which has the aim to introduce a new type of wall realised in cold formed steel (CFS) and equipped with pre-tensioned ultra-high strength (UHS) bars. • An extensive experimental campaign was conducted investigating both the local and the global behaviour of the introduced system; in particular it were performed: twenty-four coupon tests, two creep tests, eight monotonic test on the nut-UHS bar and both monotonic and cyclic tests on the entire wall. • The experimental results performed on the nut-UHS bar assemblies show that the nut resistance could limit the assembly maximum elongation. • In all the investigated cases, the design resistance is almost equal to the experimental yielding capacity of the UHS bar; the largest difference between these values is almost equal to 1.07%. • The system overstrength, defined as the ration between the maximum wall capacity with respect to the design resistance is almost constant for all the investigated specimens and equal to 1.3. • The light weight steel (LWS) solution introduced can also be used in high seismic areas, entrusting all the lateral resistant to the UHS bars, while all the others structural elements work for gravity loads while remaining in the elastic range. Lightweight Steel (LWS) systems made of Cold-Formed Steel (CFS) represent a suitable solution for structural systems combining the lightness of the construction with high structural performance under seismic actions. However, till now their structural application in high seismicity areas is still limited. In this framework, the ECCLSA research project was developed to investigate both the structural and thermal performance of an innovative LWS wall lateral force resisting system (LFRS) designed for application in low, moderate and high seismic areas. The introduced system is made by a CFS wall in conjunction with a V-braced system equipped with pre-tensioned Ultra-High-Strength (UHS) steel bars. A design procedure, as well as a large experimental campaign, were conducted to investigate both global and local performance of the introduced wall LFRS. In particular, coupon and relaxation tests were performed to investigate the main material features, while both monotonic and cyclic tests were performed on the whole system. The results show that, if well designed, the introduced LFRS system is able to counter seismic loads concentrating all the plastic deformation within the ultra-high strength bar, leaving in elastic range all the other elements. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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