PSI - Issue 44

Francesco Morelli et al. / Procedia Structural Integrity 44 (2023) 574–581 Francesco Morelli, Agnese Natali, Gabriele Poggi / Structural Integrity Procedia 00 (2022) 000–000

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values of the initial stiffness. a

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Fig. 12. Different Multimodal pushover analyses vs IDA curves (left) and multimodal combination “1+2+3” pushover analysis vs “max displ.- max base shear” IDA curve (right). 5. Conclusions The results of the dynamic analyses carried out on the HCSW 6-storey case study show the strong dependence of the structural behavior on the higher vibrational modes. Consequently, the classical pushover analysis cannot represent the behavior of the HCSW system, and it is necessary to adopt multimodal pushover analysis methods. Indeed, the pushover curves obtained combining the contribution of the first three vibration modes led to a very good agreement between the IDA and pushover curves. These results represent the first step toward the definition of a simplified analysis method, based on the multimodal pushover analysis, of structural buildings characterized by the influence of higher vibration modes such as the HCWS systems. Further studies are currently ongoing to analyze the influence of the structural geometrical and mechanical characteristics on the proposed analysis method. References Braconi, A., Caprili, S., Degee, H., Guendel, M., Hjaij, M., Hoffmeister, B., Karamanos, S. A., Rinaldi, V., Salvatore, W., 2015. Efficiency of Eurocode 8 design rules for steel and steel-concrete composite structures. Journal of Constructional Steel Research 112, 108–129. Campbell, J., Norda, H. and Meskouris, K., 2010. Improved Methods for Multimodal Pushover Analysis. In: 14th European Conference on Earthquake Engineering. Ohrid Caprili, S., Mattei, F. and Salvatore, W., 2022. Seismic performance of innovative dissipative replaceable components for steel braced frame (DRBRC). The 8th European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2022). Dall’Asta, A., Leoni, G., Zona, A., et al, 2015. Innovative hybrid and composite steel-concrete structural solutions for building in seismic area, Final Report, EUR 26932 EN. European Commission, Brussels. Das, R., Zona, A., Vandoren, B. and Degée, H., 2018. Optimizing the coupling ratio of seismic resistant HCW systems with shear links. J Constr Steel Res 147:393–407. Mattei, F., Giuliani, G., Andreotti, R., Caprili, S., Tondini, N., 2022. Experimental and numerical assessment of a steel frame equipped with Dissipative Replaceable Bracing Connections. XIX Convegno ANIDIS e XVII Convegno ASSISi. Manfredi, M., Morelli, F. and Salvatore, W., 2015. An enhanced component based model for steel links in hybrid structures : d evelopment , calibration and experimental validation. Computers & Structures 176:50–69. https://doi.org/10.1016/j.compstruc.2016.08.002. Mazzoni, S., McKenna, F., Scott, M.H., et al, 2007. Open System for Earthquake Engineering Simulation (OpenSEES), OpenSEES Command Language Manual, Pacific Earthquake Engineering Re-search (PEER) Center, 2007. Natali, A., Morelli, F. and Salvatore, W., 2022a. Seismic performance of dissipative automated rack supported warehouses. The 8th European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2022). Natali, A. and Morelli, F., 2022b. Experimental validation of dissipative reduced-section thin walled diagonals for seismic-resistant Automated Rack Supported Warehouses. XIX Convegno ANIDIS e XVII Convegno ASSISi. Natali, A., Morelli, F., Salvatore, W., Tsarpalis, D. and Vamvatsikos, D., 2022c. Experimental validation of plastic ovalization strategy for seismic-resistant Automated Rack Supported Warehouses. XIX Convegno ANIDIS e XVII Convegno ASSISi. Zona, A., Degée, H., Leoni, G. and Dall’Asta, A., 2016. Ductile design of innovative steel and concrete hybrid coupled walls. J Constr Steel Res 117:204–213.