Nonlinear Dynamic Behavior of Inelastic Space Steel Frames with Bracing System Under Earthquake Using Advanced Analysis Approach

Résumé fourni par la source

This work uses the so-called advanced analysis approach to study the dynamic behavior of inelastic nonlinear space frames reinforced by bracing system under earthquake for the first time. This approach uses the stability functions to characterize the beam-column elements’ displacement field considering geometric nonlinearity. These functions are the analytical solutions resolved from the differential equation of a beam-column element under bending moments and compressive forces at two ends. Accordingly, such nonlinear behavior can be exactly represented with only one element per member. Meanwhile, the refined plastic hinge approach is utilized to take into account the material nonlinearity via the Orbison yield surface and Column Research Council (CRC) tangent modulus. This helps to track the gradual yielding caused by residual stress as well as an integration of axial load and bending moments. Bracing members are simulated by truss members utilizing the updated Lagrangian technique for analyzing the nonlinear behavior in geometry and material. The structural energy dissipation is considered by the Rayleigh damping. The Newton–Raphson strategy integrated into the Newmark-[Formula: see text] algorithm is utilized to analyze nonlinear dynamics. Three space frames with the effect of bracing system under earthquake loading are examined to illustrate the ability of the current paradigm. Python version 3.7 on a laptop computer is employed to program numerical examples illustrated in this work. Acquired outcomes have shown that the inelastic behavior caused by the gradual yielding at plastic hinges can be effectively reduced by placing appropriate bracing systems in seismic design.

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