PSI - Issue 44

Samuel Barattucci et al. / Procedia Structural Integrity 44 (2023) 426–433 Barattucci et al/ Structural Integrity Procedia 00 (2022) 000–000

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values were assigned considering the ratios related to the minimum historic deformation demand and the minimum developed strength. Furthermore, the floating points controlling the cyclic degradation due to unloading stiffness degradation were assumed equal to 1, the floating points controlling the cyclic degradation due to reloading stiffness degradation were assumed equal to 0 and the floating points controlling the cyclic degradation due to strength degradation were assumed equal to 0.5. The numerical model thus calibrated provided the cyclic response showed in Figure 6c by black line. A good match between the numerical and the experimental results was obtained in terms of maximum lateral resistance, elastic stiffness and strength and stiffness cyclic degradation. 5. Conclusions the goal of this paper is to propose a technique to calibrate a numerical model of r.c. frame with infill panel based on results of a quasi-static cyclic experimental test. The setting of the parameters that control the model can then be used to model different structures with “similar infill”, for instance for the execution of parametric analyses. The proposed technique follows a sub-assembly approach and allows the determination of the mechanical features of the finite elements that simulates r.c. members and infill panel considering the same cyclic response of the infilled frame. Particularly, the response under large displacement amplitudes is used to calibrate the features of the r.c. members, while that under small-medium displacement amplitudes is used to determine the features of infill panel. This technique is independent from the type of elements adopted for the simulation structural members and its use could be extended also to other types of numerical models. The comparison between the results of the full-scale cyclic test and the response provided by the numerical model calibrated by means of the proposed technique shows that this numerical model is able to replicate accurately all the features of the experimental structural response in terms of base shear and Vs. displacement relationship. Acknowledgements This paper was carried out in the framework of the “Energy and seismic affordable renovation solutions” (e-SAFE) project, which has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No. 893135. Neither the Executive Agency for Small-and-Medium-sized Enterprises (EASME) nor the Euro pean Commission is in any way responsible for any use that may be made of the information it contains. References Dolsek, M., Fajfar, P., 2008. The effect of masonry infills on the seismic response of a four-storey reinforced concrete frame — deterministic assessment. Engineering Structures 30, 1991–2001. Manfredi, G., Ricci, P., Verderame, G.M., 2012. Influence of Infill Panels and their Distribution on Seismic Behavior of Existing Reinforced Concrete Buildings. The Open Construction and Building Technology Journal 6, 236-253. Negro, P., Verzeletti, G., 1996. Effect of infills on the global behaviour of r/c frames: energy considerations from pseudodynamic tests. Earthquake Engineering and Structural Dynamics 25, 753-773. Colangelo, F., 2005. Ps eudo‐dynamic seismic response of reinforced concrete frames infilled with non‐structural brick masonry. Earthquake Engineering and Structural Dynamics 34, 1219-1241. Italian Ministry of Public Works: Law n. 1086, 5/11/1971, Regulations for constructions of normal and pre-stressed reinforced concrete and with steel structure, Gazzetta Ufficiale Serie generale n. 321, 21/12/1971, Rome. (in Italian) Italian Ministry of Public Works: Ministry Decree, 30/05/1974, Technical regulations for constructions with reinforced concrete, prestressed concrete and steel structure, Gazzetta Ufficiale Serie generale, 29/07/1974, Rome. (in Italian) Italian Ministry of Public Works: Ministry Decree, 16/01/1996, Regulations for permanent and variable loads for safety verification of constructions, Gazzetta Ufficiale Serie generale, 5/02/1996, Rome. (in Italian) Mazzoni, S., McKenna, F., Scott, M.H., Fenves, G.L., Jeremic, B., 2003. OpenSees command Language Manual, Pacific Earthquake Engineering Research Center, University of California at Berkely, USA. Panagiotakos, T.B., Fardis,M.N., 1996. Seismic response of infilledRC frame structures, 11 th world conference on earthquake engineering, Acapulco,Mexico Celarec, D., Ricci, P., Dolšek, M., 2012. The sensitivity of seismic response parameters to the uncertain modelling variables of masonry-infilled reinforced concrete frames. Engineering Structures 35, 165-177.