Explicit nonlinear analysis for quasi-static behavior of frame structures with pid control and mass scaling

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2018
Kocamaz, Korhan
Performance-based seismic design of reinforced concrete frame systems requires time history analysis of the structural model under earthquake loads and estimation of damage in the members. Time history analysis of these structures is usually performed using implicit time integration methods. For the implicit integration methods, divergence of the solution is typically treated as the onset of collapse of modelled system. In this study, a nonlinear analysis platform that enables the analysis of the effect of earthquake loads and estimation of damage by using explicit time integration was developed. In the time history analysis, mass scaling is utilized to increase the stable time step size without changing the overall dynamics. Explicit time integration methods are convenient for dynamic analysis and the determination of the collapse behavior. However, for quasi-static loading as well as relatively faster pseudo-dynamic experiments, dynamic effects should be minimized for a fast solution with analysis time comparable to implicit solutions. For this purpose, a control algorithm was implemented that mimics load control in displacementcontrolled experiments. The method is tested with an experiment as well as a recently conducted pseudo-dynamic experiment.
Citation Formats
K. Kocamaz, “Explicit nonlinear analysis for quasi-static behavior of frame structures with pid control and mass scaling,” M.S. - Master of Science, Middle East Technical University, 2018.