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    Axial displacement model for reinforced concrete columns under lateral loading
    (Elsevier Science Inc, 2026) Bicici, Erkan; Sezen, Halil
    Recent major earthquakes have shown that reinforced concrete (RC) buildings with columns not meeting the seismic design and detailing requirements are susceptible to damage and collapse. For structural assessment and potential retrofit of existing RC buildings and for accurate modeling and analysis of columns in low to moderate seismic regions, it is essential to calculate the axial and lateral response accurately. Unfortunately, currently there is no established computational model to capture cyclic axial response of columns under lateral seismic loading. A novel axial model is proposed in this paper, which is integrated into dynamic lateral loaddisplacement analysis. This innovative model captures the cyclic axial displacement of RC columns, including typically overlooked axial softening behavior, which takes place after shear failure starts. The proposed model is based on the fact that the column axial stiffness decreases in parallel with lateral strength degradation beyond peak lateral strength. The innovative aspect of the model lies in accounting for axial-shear interaction by considering the variation of axial stiffness with respect to lateral displacement. The proposed model is validated by comparing the calculated response of test columns and frames with the experimental data. The new model is implemented in OpenSees software for dynamic analysis of frames to capture the additional column axial displacements due to axial softening as well as dynamic load redistribution within the frame structure.
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    Behavior of moment-resistant frames after shear-axial failure of reinforced concrete column
    (Pontificia Univ Catolica Chile, Escuela Construccion Civil, 2025) Bicici, Erkan
    Failure or collapse of entire structure triggered by a local element level failure can be defined as progressive collapse. The degradation and loss on the capacity of an element leads new load path on the structure which creates new load carrying mechanism. The most common approach is sudden removal of the column and pushdown analysis. In this study, a new method is proposed to simulate progressive collapse of reinforced concrete structures. The proposed method includes the shear-axial interaction of reinforced concrete columns and consideration of axial shortening of columns due to lateral strength degradation. The proposed method may be applicable for the progressive collapse analysis of a concrete structure under earthquake. The proposed method is tested in 2D and 3D typical benchmark reinforced concrete frames. The behavior of the frames calculated by the proposed method are compared with the results obtained from pushdown analysis to validate the accuracy of the model. A good agreement is observed between the proposed method and pushdown analysis. The shear-axial interaction method sufficiently covers the behavior of frame analysis with sudden loss of a column. Thus, the proposed method simulates more realistic failure under cyclic loading such as earthquakes.