Simplified Estimation Method of Plastic Energy Dissipation for MDOF Systems Using Force Analogy Method

Plastic energy dissipation is a key factor in the response of inelastic structures subjected to seismic input, and often regarded as primary source structural damage due deformation components. Accurately predicting structure’s plastic essential for efficient energy-based design assessment. While single-degree-of-freedom (SDOF) system provides simple effective method estimating dissipation, few studies have explored use nonlinear analysis methods or equivalent SDOF systems this purpose. Based on principle-of-force-analogy method, firstly, formulas multi-degree-of-freedom (MDOF) its were established. Secondly, two estimation MDOF proposed. Finally, numerical simulations performed several multi-story high-rise with varying heights spans compare different modes. The simulation results demonstrate that proposed accurately estimate structures, while also requiring fewer calculations less storage.