Damper Structure Optimization Scheme Decision Based on Seismic Fragility of RC Frame Structures
Based on GA-BPNN surrogate model,the structure optimization scheme decision of hybrid viscous fluid damper is made.Firstly,a specific viscous fluid damper and three optimized structure schemes are selected,and the damping force-velocity curve and damping force-velocity relationship of the damper are obtained by CFD numerical simulation.These dampers are then implemented in RC frame structures designed for seismic resistance,four RC frames with different structural viscous fluid dampers are obtained.Subsequently,22 seismic wave acceleration time history curves are selected,and the incremental dynamic analysis(IDA)method is used to calculate the structure of the RC frame and the original frame structure with different structural viscous fluid dampers,yielding IDA curves.Finally,seismic fragility curves are plotted based on selected performance levels and seismic probability demand models,facilitating comparative analysis and decision-making regarding different damper structure optimization schemes.The results show that the inter-story drift angles of RC frame structures significantly decrease,and the seismic resistance is effectively improved with the implementation of viscous fluid dampers.Under an 8-degree frequent earthquake,the probability of slight damage is the highest for the RC frame structure without viscous fluid dampers,while the probability of severe damage and collapse is the lowest for the RC frame structure with optimized construction scheme 1 of viscous fluid dampers.Moreover,the RC frame structure with optimized construction scheme 1 of viscous fluid dampers exhibits the highest collapse-resistant reserve coefficient.Compared to the non-optimized construction of viscous fluid dampers,the collapse-resistant reserve coefficient shows a increase of 14.32%.
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