BEAM-COLUMN ELEMENT BASED ON CONSTITUTION INTEGRATION OF YIELD SURFACE OF SECTIONAL AXIAL FORCE AND BENDING MOMENT

Beam-column element model is the basis of structural finite element analysis; however, existing plastic hinge model and fiber model can not simultaneously satisfy calculation accuracy and efficiency. Based on Euler-Bernoulli beam theory, theory of plasticity and numerical method, a novel planar beam-column element was proposed in this paper, which was derived through constitution integration of yield surface of sectional axial force and bending moment in sectional internal force space. Both static and dynamic elastoplasticy analyses were implemented for a cantilever column and frame columns respectively. The results show that the calculation accuracy of proposed model is close to fiber model, while the efficiency is much higher than that of fiber model.