An Analytical Model for RC Columns Subjected to Combined Loadings Including Torsion

Abstract eng:
Reinforced concrete (RC) columns can be subjected to torsional moments in addition to flexural, axial and shear forces during earthquake excitations. Therefore, it is essential to develop models to predict their behavior under combined loadings. The objective of this study is to propose a rational model capable of predicting the entire loading history of circular RC columns under combined loading. As an initial step of this study, an analytical model for RC columns subjected to torsion and axial force is developed. The existing rotating-angle softened truss model (RA-STM) was chosen as a basis and it was modified to account for tension-stiffening effect and biaxial constitutive laws of R C in the proposed model. This addition makes it possible to estimate the thickness of shear flow zone. As a result, it is possible to predict the torque-twist curve of circular RC column even after the postpeak behavior. The performance of proposed method is validated with the test results of a half-scale circular RC column under torsion and axial compression. The proposed model can be used as a basis to predict the behavior of circular RC columns under combined loadings including shear and flexure.

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