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Seismic Risk Mitigation of a Long-Span Historical Building Through a Wooden Roof-Box Structure
Seismic risk mitigation measures for historic buildings often encompass the introduction of perimeter ties, or floor and roof diaphragms to prevent the onset of local mechanisms, particularly the out-of-plane mechanisms. Among the retrofit strategies, roof diaphragms, first adopted for the seismic retrofit of churches, are nowadays commonly used for all building types. More recently, the solution has been even more appreciated because, unless static problems exist, it does not require the building downtime, nor the relocation of the building inhabitants/functions, which are acknowledged as the major obstacles to any retrofit initiative. Roof diaphragms are designed to adsorb the seismic action of both the roof and the out-of-plane loaded walls and transfer it to the seismic-resistant walls. A proportioning approach was introduced by Giuriani and Marini; the approach considers the lateral load-resisting system (the box structure) as composed of the roof pitch diaphragms and the headwalls, while the longitudinal walls are modeled as trusses, only transferring their inertia forces to the pitch diaphragm. Such a simplified model was effective in the design practice for proportioning roof diaphragm components in regular buildings. In the case of oblong buildings, however, an enhancement of the analytical model was recently proposed, to account for the interaction of the roof diaphragm with the longitudinal masonry walls, which are therefore introduced in the lateral resisting system. Such an upgrade allows for a more accurate representation of the global 3D behavior of the lateral load-resisting box structure, leading to a more realistic prediction of the internal actions, with the advantage of significantly reducing the axial forces in the compressed longitudinal eaves chords of the roof diaphragm. In this paper, the enhanced simplified analytical model is applied in the context of the seismic retrofit of an oblong historical reference building operated with a wooden roof diaphragm. The effectiveness and drawbacks of the enhanced approach are critically commented on.
Seismic Risk Mitigation of a Long-Span Historical Building Through a Wooden Roof-Box Structure
Seismic risk mitigation measures for historic buildings often encompass the introduction of perimeter ties, or floor and roof diaphragms to prevent the onset of local mechanisms, particularly the out-of-plane mechanisms. Among the retrofit strategies, roof diaphragms, first adopted for the seismic retrofit of churches, are nowadays commonly used for all building types. More recently, the solution has been even more appreciated because, unless static problems exist, it does not require the building downtime, nor the relocation of the building inhabitants/functions, which are acknowledged as the major obstacles to any retrofit initiative. Roof diaphragms are designed to adsorb the seismic action of both the roof and the out-of-plane loaded walls and transfer it to the seismic-resistant walls. A proportioning approach was introduced by Giuriani and Marini; the approach considers the lateral load-resisting system (the box structure) as composed of the roof pitch diaphragms and the headwalls, while the longitudinal walls are modeled as trusses, only transferring their inertia forces to the pitch diaphragm. Such a simplified model was effective in the design practice for proportioning roof diaphragm components in regular buildings. In the case of oblong buildings, however, an enhancement of the analytical model was recently proposed, to account for the interaction of the roof diaphragm with the longitudinal masonry walls, which are therefore introduced in the lateral resisting system. Such an upgrade allows for a more accurate representation of the global 3D behavior of the lateral load-resisting box structure, leading to a more realistic prediction of the internal actions, with the advantage of significantly reducing the axial forces in the compressed longitudinal eaves chords of the roof diaphragm. In this paper, the enhanced simplified analytical model is applied in the context of the seismic retrofit of an oblong historical reference building operated with a wooden roof diaphragm. The effectiveness and drawbacks of the enhanced approach are critically commented on.
Seismic Risk Mitigation of a Long-Span Historical Building Through a Wooden Roof-Box Structure
RILEM Bookseries
Endo, Yohei (editor) / Hanazato, Toshikazu (editor) / Labò, Simone (author) / Marini, Alessandra (author) / Giuriani, Ezio Pilar (author) / Zanni, Jacopo (author) / Riva, Paolo (author)
International Conference on Structural Analysis of Historical Constructions ; 2023 ; Kyoto, Japan
Structural Analysis of Historical Constructions ; Chapter: 86 ; 1077-1087
RILEM Bookseries ; 47
2023-09-04
11 pages
Article/Chapter (Book)
Electronic Resource
English
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