Sepulveda, C.C.SepulvedaMosqueda, G.G.MosquedaUang, C.C.UangCHUNG-CHE CHOUWang, K. J.K. J.Wang2023-04-192023-04-192022-01-01https://scholars.lib.ntu.edu.tw/handle/123456789/630309A hybrid simulation methodology is developed to analyze the system-level seismic response of a steel moment frame structure with an experimental subassembly exhibiting column shortening. Considering the high axial stiffness of frames, the axial load is typically applied by force-controlled loading without consideration of displacement compatibility. To account for shortening, a new approach is proposed to control stiff axial degrees of freedom using an equivalent-force control method within the displacement-based framework for hybrid simulation. The column axial load on the experimental subassembly is imposed using force-controlled actuators based on the estimated axial force in the numerical model. The shortening in the experimental column is then measured and an equivalent force is returned and applied at the top of the column node to impose a compatible shortening in the numerical model. The lateral degrees of freedom are applied using a substructuring strategy that considers the control points in the experimental setup. Numerical studies are carried out to demonstrate that force equilibrium and displacement compatibility at the top end of the buckling column can be achieved reliably using this approach.conference paper2-s2.0-85138471512https://api.elsevier.com/content/abstract/scopus_id/85138471512