Implicit/explicit multi-time step co-computations for predicting reinforced concrete structure response under earthquake loading

The paper explores the GC (Gravouil and Combescure) partitioning strategy recently adopted in real-time testing (RTDS) and pseudo-dynamic testing (PsD) with dynamic substructuring. The GC method is a multi-time step subdomain algorithm able to couple any time integration schemes from the Newmark fam...

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Vydáno v:Soil dynamics and earthquake engineering (1984) Ročník 33; číslo 1; s. 19 - 37
Hlavní autoři: Brun, M., Batti, A., Limam, A., Combescure, A.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Kidlington Elsevier Ltd 01.02.2012
Elsevier
Témata:
algorithms
buildings
computer software
concrete
Earth sciences
Earth, ocean, space
earthquakes
Earthquakes, seismology
energy
Engineering and environment geology. Geothermics
Engineering geology
Engineering Sciences
Exact sciences and technology
Internal geophysics
Italy
Mechanics
Natural hazards: prediction, damages, etc
Physics
prediction
Solid mechanics
steel
Southern Europe
Italy
Europe
concrete
strain
steel
algorithms
interfaces
software
testing
fine-grained materials
accuracy
loading
finite element analysis
earthquakes
coupling
displacements
earthquake engineering
strategy
energy
ISSN:0267-7261, 1879-341X
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Popis
Shrnutí:The paper explores the GC (Gravouil and Combescure) partitioning strategy recently adopted in real-time testing (RTDS) and pseudo-dynamic testing (PsD) with dynamic substructuring. The GC method is a multi-time step subdomain algorithm able to couple any time integration schemes from the Newmark family with the appropriate time step size dependent on the subdomain. The partitioning method is numerically tested by developing an external software able to couple finite element codes based on implicit and explicit time integration schemes. A complex Finite Element mesh partitioning, exhibiting a large number of interface points, has been considered for a full-size reinforced concrete frame structure subjected to an earthquake loading: the well-known SPEAR structure pseudo-dynamically tested at the ELSA laboratory, in Ispra, Italy. Implicit and explicit parts of the structure are modelled using multi-fibre beam elements whose cross-section is divided into steel and concrete fibres associated with cyclic and nonlinear behaviours. The accuracy of the results from the Explicit/Implicit multi-time step co-computation has been proved by comparing with the results from full explicit and full implicit computations. Despite the very large duration of the earthquake excitation and the number of interface nodes involved into the mesh partitioning, the Explicit/Implicit multi-time step co-computations provide very accurate global (displacements, forces at the base) and local (maximum strains in concrete) results while reducing by a factor 2 the computation times. Finally, it has been observed that the dissipated energy at the interface coming from the GC coupling algorithm remains very low at the end of the earthquake loading, less than 2% of the external energy, for time step ratios between the large and fine time steps ranging from 20 to 200. ► Heterogeneous explicit/implicit multi-time step co-computations with FE code. ► Adopting appropriate time step size dependent on the subdomain (substructure). ► Application for a real full-scale RC frame structure under earthquake loading. ► Suitability of the coupling method for pseudo-dynamic testing with substructuring.
Bibliografie:ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 23
ISSN:0267-7261
1879-341X
DOI:10.1016/j.soildyn.2011.07.005