Natural Hazards Research Summit 2024: Controlling higher-mode seismic responses in reinforced concrete core wall buildings using force-limiting floor-to-wall connections

This poster focuses on the seismic response of a three-dimensional eighteen-story reinforced concrete core wall building model with modified friction-based force-limiting connections (Modified FDs) between the floors and reinforced concrete core wall. One set of design parameters that define the predetermined discrete variable friction force-displacement response of the Modified FDs is determined using Pareto front analysis. The Pareto front analysis utilizes results from systematic parametric numerical earthquake simulations of two-dimensional building models and results from a practical force-based design method for force-limiting connections. A three-dimensional model of an eighteen-story reinforced concrete core wall building with experimentally calibrated wall piers and the Modified FDs considering the determined set of design parameters is developed. Thirteen design-level far-field bidirectional ground motions are considered as seismic excitations. The use of the Modified FDs demonstrates a reduction in the peak torsional moment and base strain responses in the wall piers. A statistical analysis indicates a reasonable range of relative
displacement between the floors and the wall piers. The use of the Modified FDs does not increase the expected post-earthquake residual drift responses in the building system. The peak floor acceleration and base shear responses are limited, attributed to the controlled inelastic shear-dominant higher-mode responses enabled by the Modified FDs.