PSI - Issue 64

1974 E. Michelini et al. / Procedia Structural Integrity 64 (2024) 1967–1974 8 Elena Michelini, S ł awomir Dudziak, Simone Ravasini, Beatrice Belletti / Structural Integrity Procedia 00 (2019) 000–000

• In the case of buildings with heavily reinforced roof beams, the possible occurrence of alternative load-bearing paths, in which the upper part of the structure behaves like a suspension system, can take place. However, the development of such alternative static scheme is limited by the resistance of the beam-column joints, which are usually not designed to sustain significant horizontal forces, especially in existing low-code buildings. Ongoing research on the topic discussed in the paper will consider the following issues: • Numerical analyses will be repeated by using shell elements, able to reproduce the complex stress state within the joints more accurately. These analyses could be helpful in determining the non-linear deformational characteristics of joints, which can be applied in the simplified models with frame elements. • A 3D model of the analyzed building is being developed, to account for the resistant contribution offered by secondary beams perpendicular to the main frames, and/or infill walls. Acknowledgements This study was developed within FAIL-SAFE project ("near-real-time perFormance Assessment of exIsting buiLdings Subjected to initAl Failure through multi-scalE simulation and structural health monitoring", CUP N.E53D23003350006), which was funded by European Union through Next-GenerationEU programme - National Recovery and Resilience Plan (PNRR) - Mission 4, Component 2, Investment 1.1, PRIN 2022 programme (D.D. 02/02/2022, n.104). References Belletti, B., Michelini, E., Ravasini, S., 2022. Role of floor diaphragms on the seismic response of reinforced concrete frames. 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