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Seismic collapse assessment of archetype frames with ductile concrete beam hinges

Resilient Cities and Structures 2023年第1期2卷 103-119页

作者： Hasan Tariq Ezra A.Jampole Matthew J.Bandelt Thornton Tomasetti New YorkNYUSA Buildings and Structures Group ExponentNew YorkNYUSA John A.Reif Jr.Dept.of Civil and Environmental EngineeringNew Jersey Institute of TechnologyNewarkNJUSA

Highly ductile cement-based materials have emerged as alternatives to conventional concrete materials to improve the seismic resistance of reinforced concrete(RC)*** experimental and numerical research on the behavior of individual components has provided signiﬁcant knowledge on element-level response,relatively little is known about how ductile cement-based materials inﬂuence system-level behavior in seismic *** study uses recently developed lumped-plasticity models to simulate the unique failure characteristics and ductility of reinforced ductile-cement-based materials in beam hinges and applies them in the assessment of archetype frame *** story heights(four,eight,and twelve),frame conﬁgurations(perimeter ***),materials(conventional *** concrete),and replacement mechanisms within the beam hinges are considered in the seismic analysis of the archetype *** and comparisons are made in terms of the probability of collapse at 2%in 50-year ground motion,mean annual frequency of collapse,and adjusted collapse margin ratio(ACMR)across archetype *** results show that engineered hpfrccs in beam plastic-hinge regions can improve the seismic safety of moment frame buildings with higher collapse margin ratios,lower probability of collapse,and the ability to withstand large *** is also reported on how ductile concrete materials can reduce concrete volume and longitudinal reinforcement tonnage across frame conﬁgurations and story heights while maintaining or improving seismic resistance of the structural *** demonstrate future research needs to assess life-cycle costs,predict column hinge behavior,and develop code-based design methods for structural systems using highly ductile concrete materials.

关键词： Lumped-plasticity model Archetype frames hpfrcc plastic-hinge Collapse assessment Mean annual frequency of collapse

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