Seismic Response of Steel Frames Considering Actual Behaviour of Connections

摘要

In the analysis and design of steel building frames, it is customary to represent jointrnbehavior by an idealized model, either as a rigid or as a pinned joint. However,rnexperimental investigations show that most pinned connections exhibit somernrotational stiffness, while rigid connections possess some degree of flexibility. Thernobjective of this paper is to evaluate the influence of the partial rigidity of thernconnection on the behavior and seismic response of braced simple steel frames. ThernKishi and Chen power model is used for modeling of non-linear behavior of thernconnections. Particular attentions are devoted to inelastic modeling of frameworkrncomponents for accurate representation of frame behavior. Nonlinear static pushoverrnand nonlinear time history analyses are applied for comparing the idealized modelrnwith the real state of the structure. Results indicate that the use of bracing elementsrnreduces the sensitivity of the frames to differences in connection behavior andrnconsidering ideally pinned connection for simple frames is a reasonable assumption.