Abstract
Metallic tie-rods are currently used in many historical buildings for absorbing the out-of-plane horizontal forces of arches, vaults and roof trusses, despite they exhibit several limitations under service and seismic conditions. In this paper, a post-tensioned system based on the superelastic properties of Ni-Ti shape memory alloys is proposed for improving the structural performances of traditional metallic tie-rods. First, the thermal behavior under service conditions is investigated based on the results of numerical and experimental studies. Subsequently, the seismic performances under strong earthquakes are verified trough a number of shaking table tests on a 1:4-scale timber roof truss model. The outcomes of these studies fully confirm the achievement of the design objectives of the proposed prototype device.
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Acknowledgments
This work has been carried out within a research contract with CETMA (Center Planning, Design and Technology of Materials) of Brindisi (Italy). The authors are also grateful to Domenico Nigro (University of Basilicata) for his valuable help in setting up the testing apparatus and executing the experimental tests.
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This article is an invited paper selected from presentations at the International Conference on Shape Memory and Superelastic Technologies 2011, held November 6-9, 2011, in Hong Kong, China, and has been expanded from the original presentation.
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Cardone, D., Sofia, S. Experimental Evaluation of a Device Prototype Based on Shape Memory Alloys for the Retrofit of Historical Buildings. J. of Materi Eng and Perform 21, 2719–2728 (2012). https://doi.org/10.1007/s11665-012-0414-x
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DOI: https://doi.org/10.1007/s11665-012-0414-x