Melatti, Victor;
(2021)
Design and development of dissipative anchoring system for seismic strengthening of heritage structures.
Doctoral thesis (Ph.D), UCL (University College London).
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Abstract
The scope of this research is to develop the next generation of dissipating grouted anchoring systems for the seismic strengthening of historical masonry structures. Historic masonry buildings often experience out-of-plane failure due to the lack of effective connection between perpendicular walls. The insertion of steel elements at corner connections is commonly applied in rehabilitation practice to control this collapse mode and locally increase the strength and stiffness of the structure. Nonetheless, they are unable to dissipate the seismic forces rather than through cracking and yielding of the steel elements, as they present limited dissipative and ductility capacity. To this purpose, the proposed system integrates a friction-based dissipative device with stainless-steel anchors grouted within the thickness of walls. The system provides 1) effective connections between panels and reduced intrusiveness, 2) energy dissipation capacity, and additional ductility. The proposed framework addresses the assessment and refinement of the dissipative system by means of experimental and numerical activities and provides a displacement-based design tool for its implementation to heritage buildings. The first goal of this research is the refinement of a patented prototype of a friction-based device to improve its short-term performance as well as deliver a reliable and robust long-term behaviour. This task is performed according to a test-analyse-redesign procedure that can be used to improve the durability and stability of a typical friction-based device. The performance of the innovative system is then investigated by experimental tests performed on specimens reproducing a strengthened masonry connection. To address the technical gap in design codes, the second aim of this research is to propose a design method for the implementation of the dissipative system within the framework of the displacement-based design. The design procedure is applied to a case-study structure and the performance of the building strengthened by the innovative anchoring system is determined by non-linear dynamic analysis. Performance’s comparisons between different strengthening solutions are drawn, emphasizing that the additional ductility capacity reduces the seismic demand, thus resulting in a less invasive intervention in compliance with the requirements of current codes.
| Type: | Thesis (Doctoral) |
|---|---|
| Qualification: | Ph.D |
| Title: | Design and development of dissipative anchoring system for seismic strengthening of heritage structures |
| Event: | UCL |
| Open access status: | An open access version is available from UCL Discovery |
| Language: | English |
| Additional information: | Copyright © The Author 2021. Original content in this thesis is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) Licence (https://creativecommons.org/licenses/by-nc/4.0/). Any third-party copyright material present remains the property of its respective owner(s) and is licensed under its existing terms. Access may initially be restricted at the author’s request. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10139439 |
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