Non-iterative Capacity Demand Spectrum Method (CDSM) for Seismic Demand Evaluation of Mid-Rise RC Buildings Incorporating Friction Dampers

This project implements and tests a simplified, non‑iterative Capacity Demand Spectrum Method (CDSM) for estimating the seismic demand of mid‑rise reinforced‑concrete (RC) buildings that have been retrofitted with friction dampers. Typical seismic assessments use complex, iterative steps to find inelastic displacement demands during an earthquake. To cut down on computation time, this study uses a non‑iterative approach to predict the maximum inelastic displacement and to check how well the retrofitted system performs. The method combines spectral response acceleration values taken from building codes with actual ground‑motion records to simulate how the building would behave in an earthquake. Structural response histories are run in ETABS software to confirm that the CDSM

works as intended. By looking at how the building frames interact with the friction dampers, the project offers a clear framework for evaluating seismic‑mitigation strategies. The guidance includes: – how to model energy‑dissipation devices, – how to build the RC frame model, and – how to compare iterative and non‑iterative demand‑estimation techniques. Overall, the work provides a practical, computationally efficient way to assess the safety of retrofitted structures under seismic loading.

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