Seismic performance analysis of steel-brace RC frame using topology optimization
2019
Seismic performance analysis of steel-brace reinforced concrete (RC) frame using topology optimization in highly
seismic region was discussed in this research. Topology optimization based on truss-like material model was used, which was to
minimum volume in full-stress method. Optimized bracing systems of low-rise, mid-rise and high-rise RC frames were
established, and optimized bracing systems of substructure were also gained under different constraint conditions. Thereafter,
different structure models based on optimized bracing systems were proposed and applied. Last, structural strength, structural
stiffness, structural ductility, collapse resistant capacity, collapse probability and demolition probability were studied. Moreover,
the brace buckling was discussed. The results show that bracing system of RC frame could be derived using topology
optimization, and bracing system based on truss-like model could help to resolve numerical instabilities. Bracing system of
topology optimization was more effective to enhance structural stiffness and strength, especially in mid-rise and high-rise
frames. Moreover, bracing system of topology optimization contributes to increase collapse resistant capacity, as well as reduces
collapse probability and accumulated demolition probability. However, brace buckling might weaken beneficial effects.
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