Evaluation of the Seismic Performance Factors for Hybrid Coupled Core Wall Systems with Steel Fuse Coupling Beams.

摘要

Coupled core wall systems with steel coupling beams are effective seismic force resisting systems to resist structural collapse. A typical coupling beam shear wall system would dissipate energy through the formation of plastic hinges at the coupling beam-wall interface. These plastic hinges would damage the coupling beam, requiring an infeasible and uneconomical repair involving the replacement of the beam embedded in the concrete wall pier. However, research at the University of Cincinnati has introduced a weak-link section (the fuse) at the mid-span of the coupling beam that will dissipate energy through shear yielding, leading to the development and modification of the steel fuse coupling beams. This would allow the plasticity at the face of the wall to be shifted to the mid-span of the coupling beam, requiring a feasible and economical repair involving only the replacement of the fuse at mid-span.;The objective of this investigation is to evaluate the performance of steel fuse coupling beams in hybrid coupled core wall systems as a new seismic force resisting system in accordance with the Federal Emergency Management Agency (FEMA) P695 Quantification of Building Seismic Performance Factors (2009). This involves developing a system concept, obtaining required information, characterizing system behavior, and developing and analyzing thirty-six archetype models using finite element software. The results from the finite element analyses are evaluated to quantify the seismic performance factors for the system and determine if the system can be included in ASCE/SEI 7 Minimum Design Loads for Buildings and Other Structures. From this investigation, it can be concluded that hybrid coupled core wall systems with steel fuse coupling beams can be considered for inclusion in ASCE/SEI 7 Minimum Design Loads for Buildings and Other Structures as evident from the evaluation of the results from the finite element analyses.