Abstract
From the aspects of earthquake resilience, energy dissipation efficiency and building functionality, a novel post-tensioned energy dissipation (NPTED) joint with replaceable rhombus driving friction (RDF) damper is developed. To reach a well-balanced design scheme of a precast concrete (PC) frame with the NPTED joints, a multi-objective seismic optimization strategy with the dual concern of material cost and energy dissipation is put forward. The hysteretic behavior of the RDF damper is analytically derived, tested and numerically implemented into a finite element platform as a uniaxial material with the NPTED joint. To respond to the optimization problem in a more efficient way, the non-dominated sorting genetic algorithm (NSGA-II) is modified to improve the quality of population. The development of some interfaces and batteries within the finite element analytical platform and Grasshopper® makes the parametrized modeling and structural finite element analysis be automated during the optimization process. The effectiveness of the proposed optimization strategy, as well as the NPTED joints, has been fully demonstrated by a case study on a 12-story PC frame. The results indicate that the seismic design of those performance-dominant cases is controlled by rare-level earthquake while that of those cost-dominant ones is controlled by frequent-level earthquake.
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