A shear-deformable fiber beam-column element for seismic analysis of steel structures

Abstract eng:
A high-performance, force-based fiber beam-column element is proposed for the capacity assessment of frame structures under high shear. The proposed element is suitable for the performance assessment of large-scale steel structures, which are not flexure-dominated. The element kinematics are obtained through the natural-mode method, while the element state-determination phase is based on a three-dimensional material law. Therefore, instead of uniaxial material laws, which are typically associated together with fiber elements, multi-dimensional laws are adopted taking into consideration the interaction between axial, bending and shear forces. The resulting formulation avoids shearlocking and can be naturally combined with the corotational formulation to account for geometric nonlinearities. Numerical examples are presented confirming the numerical accuracy and the computational efficiency of the proposed formulation under monotonic, cyclic and seismic loading. Compared to flexure-dominated fiber elements, excellent agreement can be achieved with a slight increase of the computing cost. 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